CN1688943A - Hologram recording/reproducing method and device thereof - Google Patents

Hologram recording/reproducing method and device thereof Download PDF

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Publication number
CN1688943A
CN1688943A CN 03823631 CN03823631A CN1688943A CN 1688943 A CN1688943 A CN 1688943A CN 03823631 CN03823631 CN 03823631 CN 03823631 A CN03823631 A CN 03823631A CN 1688943 A CN1688943 A CN 1688943A
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zero order
treatment region
order beam
recording medium
diffracted
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洼田义久
田中觉
伊藤善尚
橘昭弘
黑田和男
杉浦聪
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Pioneer Corp
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Pioneer Corp
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Abstract

A method for holographic recording and reproducing includes a recording process and a reproducing process. In the recording process, a coherent reference beam is spatially modulated in accordance with information to be recorded to generate a signal beam, and the signal beam is converged. The converged signal beam enters and passes through a recording medium made of a photosensitive material. A diffraction grating area according to a light interference pattern is created in a portion where a 0th-order beam and a diffraction beam of the signal beam interfere with each other inside the recording medium. In the reproducing process, a reproduced wave corresponding to the signal beam is generated by illuminating the diffraction grating area with the reference beam.

Description

The method and the device thereof that are used for holographic recording and reproduction
Technical field
The present invention relates to a kind of recording medium of being made by photochromics, so-called holographic memory especially, the present invention relates to a kind of method that is used for holographic recording and reproduction, and the optical information recorder and the transcriber that utilize this holographic memory.
Background technology
The volume hologram recording system is as a kind of digital data recording system of utilizing the holography principle and well-known.This system is characterised in that recorded information on the recording medium of being made by photochromics, the photorefractive material (photorefractive material) that photochromics such as medium refraction index changes.
A kind of holographic recording of routine and reproducting method utilize Fourier transform to write down and reproduce.
With reference to figure 1, in the 4f of routine series holographic recording and transcriber, beam splitter 13 is divided into light beam 12a and 12b with the laser beam 12 that lasing light emitter 11 produces.The diameter of beam expander BX expanded light beam 12a.Then, parallel beam 12a acts on spatial light modulator SLM, as panel of transmission TFT LCD (LCD) etc.Spatial light modulator SLM receives the information that will write down, and as the electronic signal by encoder encodes, to form 2-D data, just forms with the corresponding bright and faint spots pattern of this information in the plane etc.When light beam 12a passed spatial light modulator SLM, spatial light modulator SLM was the signal beams that comprises the data-signal component with light beam 12a optical modulation.Be arranged on the be separated by Fourier transform lens 16 at focal distance f place because the signal beams 12a that comprises the spot pattern component of signal passes, so the spot pattern component of signal is transformed to Fourier components, and converges on the recording medium 10 with spatial light modulator SLM.The light beam 12b that is separated by beam splitter 13 guides in the recording medium 10 by catoptron 18 and 19.Light beam 12b intersects in the inside of recording medium 10 and the light path of signal beams 12a as the reference light beam.Light beam 12b and signal beams 12a interference form optical interference.The overall optical interferogram is recorded as diffraction grating, as change of refractive (refractive-index grating) etc.
As mentioned above, the spot pattern data make relevant parallel beam generation diffraction, and utilize Fourier transform lens to form optical imagery.On the focal plane of Fourier transform lens, i.e. image distribution on the Fourier plane and coherent reference beam interference.Then, near focus, interference fringe is recorded on the recording medium.After finishing first page record, make rotatable catoptron rotation predetermined number of degrees with respect, and parallel moving, so that change the incident angle that reference beam 12b incides recording medium 10.Then, follow second page of process record same as described above.Can carry out the multi-angle record in this manner.
On the other hand, in the playback light dot pattern image, use inverse Fourier transform.In reproducing the information that has write down, as shown in fig. 1, for example, spatial light modulator SLM, therefore the light path of truncated signal light beam 12a has only reference beam 12b to incide on the recording medium 10.The position of catoptron and angle can be by changing its rotation and mobile combination is controlled, thereby make the incident angle of reference beam 12b can be identical with the incident angle in the recording process that will reproduce page or leaf.The light beam that reveals again that reveals the signal beams that has write down again appears at the opposition side that the signal beams 12a that has write down incides recording medium 10.The light beam that reveals is again guided to inverse Fourier transform lens 16a and carries out inverse Fourier transform, thereby reproduce the spot pattern signal.The spot pattern signal is received by the photodetector 20 such as charge coupled device ccd etc. that places lens 16a focal position, and changes electric digital data signal again into.Then, thus this digital data signal is sent to demoder decodes raw data.
With reference to figure 1, utilize usually multi-angle and multi-wavelength with a plurality of image recordings in several millimeters volumes of recording medium, so that with high density recorded information in the certain volume of recording medium.Therefore, the wide visual field of signal beams and reference beam and long distance are relevant is essential for the selectivity of guaranteeing angle and wavelength.Thus, reduced the beam intensity of the units of light that is used to write down.It is essential repeatedly writing down for high density recording, therefore need have big erasing time constant and be easy to carry out the repeatedly recording medium of record.
Two lens that conventional holographic recording and transcriber need high standard (high spec), i.e. Fourier transform lens and inverse Fourier transform lens.This device also needs to be furnished with high precision paging control gear, is used for being controlled at information is write down and the reference beam of reproduction process.Therefore, have such shortcoming, promptly this device size becomes big.
Summary of the invention
An object of the present invention is to provide a kind of method of holographic recording and reproduction and device for this reason of being used for, it can reduce size and recorded hologram on holographic recording medium.
According to the present invention, a kind of method that is used for holographic recording and reproduction is provided, this method comprises recording process and reproduction process,
Recording process may further comprise the steps:
Produce signal beams according to the information that will write down by spatial modulation coherent reference light beam;
Recording medium with the signal beams irradiation is made by photochromics passes described recording medium to allow signal beams; And
In the part that described recording medium inside interferes with each other, produce diffraction grating zone at the zero order beam of signal beams and diffracted beam by the light interference pattern record; And
The reproduction process may further comprise the steps:
Shine described diffraction grating zone with described reference beam, to produce reproduction ripple corresponding to this signal beams.
Signal beams is the light beam that produces by carrying out this operation of spatial modulation coherent reference light beam according to the information that will write down, and this signal beams comprises zero order beam, and its wavefront no matter whether carry out spatial modulation all is of similar shape; Diffracted beam with the experience spatial modulation.Therefore, the present invention utilizes the zero order beam of signal beams as the reference light that is used for holographic recording.
In record, utilize signal beams irradiation recording medium, producing the optical interference candy strip that forms by zero order beam in the light path of signal beams and diffracted beam, thereby in recording medium, note refractive-index grating corresponding to this interference fringe pattern.
In reproduction, with not passing through the signal beams of spatial modulation, promptly utilize the locality condition identical and the non-modulation reference beam of angle condition with used signal beams in the record, shine recording medium, particularly refractive-index grating wherein.Because non-modulation reference beam comprises zero order beam as principal ingredient, therefore the non-modulation reference beam refractive-index grating that shines recording medium produce with write down in the identical reproduction ripple of used signal beams wavefront.
In the detection of reproducing ripple, the reproduction ripple that the refractive-index grating from recording medium sends is overlapping with the non-modulation reference beam that is used to reproduce.Removing or reduce the non-modulation reference beam that is used to reproduce helps easily to detect the reproduction ripple and reproduce recorded information on electricity.
According to the present invention, a kind of recording medium also is provided, the photochromics of record is made by utilizing the coherent light beam irradiation, this recording medium includes the irradiating light beam treatment region, it is arranged on the opposite side of the recording medium plane of incidence that is positioned at light beam incident in the described recording medium, this incident beam treatment region is separated from each other the zero order beam and the diffracted beam of light beam, thereby a part of incident beam is turned back to described recording medium inside.
In order to remove or reduce the non-modulation reference beam that is used to reproduce, as shown in Figure 2, recording medium 10 has an incident beam treatment region R, this incident beam treatment region comprises the zero order beam of processing signals light beam and the zero order beam treatment region R1 of non-modulation reference beam, and the diffracted beam treatment region R2 of the diffracted beam of processing signals light beam, this incident beam processing region disposes in the following manner, promptly, this incident beam treatment region places the beam waist of non-modulation reference beam, wherein non-modulation reference beam is assembled by collector lens, focuses on the opposite side of the plane of incidence that light beam incides this recording medium.
Consideration is used as phase conjugate wave in record and reproducting method and is used for one of method of holographic recording and playback system.Be similar to additive method, the reproducting method that utilizes the phase conjugation light beam generally need record with reproduce in use identical reference beam.For example, a kind of method that is used to write down with information reproduction, wherein produce and write down refractive-index grating by the interference in recording medium in the following manner, promptly, signal beams is shone on the recording medium, and, get back to the phase conjugate wave of recording medium, thereby phase conjugate wave and signal beams are interfered with each other with generation by mirror reflects.In this record and reproducting method, have a lot of shortcomings, insert and remove catoptron as needs and since signal beams particularly zero order beam return and cause the light source degeneration, and the large-scale device that comprises the optical system that prevents back light.On the contrary, according to the present invention, the incident beam treatment region has solved the problems referred to above, and is because utilize different processing, as by separating zero order beam in the incident light and diffracted beam being handled separately, inner next a part of incident beam is turned back to recording medium.
In addition, be different from conventional holographic recording and reproducting method, the present invention does not need to provide separately two optical systems for reference beam and signal beams.And method of the present invention does not need the high performance collector lens as object lens etc.Adopt this record and reproducting method to simplify efficiently and miniaturization record and transcriber, because utilize zero order beam and the diffracted beam (carrying out spatial modulation) that is included in the signal beams according to the information that will write down.
According to the present invention, a kind of method that is used for holographic recording further is provided, may further comprise the steps:
Produce signal beams according to information to be recorded by spatial modulation coherent reference light beam;
The recording medium that utilizes the signal beams irradiation to be made by photochromics passes described recording medium to allow signal beams; And
In described recording medium inside, in the part that the zero order beam and the diffracted beam of signal beams interferes with each other, produce diffraction grating zone by the light interference pattern record.
According to the present invention, a kind of method that is used for the reconstruction of hologram further is provided, may further comprise the steps:
The recording medium of being made by photochromics is provided, and it has the diffraction grating zone that forms by recording process, and this recording process may further comprise the steps: produce signal beams according to information to be recorded by spatial modulation coherent reference light beam; Utilize signal beams irradiation recording medium, to allow signal beams to pass described recording medium, so that in the zero order beam of the signal beams of described recording medium inside and part that diffracted beam interferes with each other, form diffraction grating zone by the light interference pattern record; And
The coherent reference light beam is shone the diffraction grating zone, to produce reproduction ripple corresponding to signal beams.
According to the present invention, a kind of holographic recording and transcriber are provided in addition, be used for information is recorded as the diffraction grating zone of recording medium, and be used for reproducing described recorded information from described diffraction grating zone, described holographic recording and transcriber comprise:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
The signal beams generation unit comprises spatial light modulator, and described spatial light modulator is modulated described reference beam according to described information space to be recorded, to produce signal beams;
Interference unit, comprise illuminating optical system, be used to utilize signal beams irradiation recording medium, to allow this signal beams to enter and pass described recording medium, described illuminating optical system is in described recording medium inside, in the part that the zero order beam and the diffracted beam of signal beams interferes with each other, forms the diffraction grating zone according to light interference pattern, described illuminating optical system utilizes described reference beam to shine described diffraction grating zone, to produce the reproduction ripple corresponding to signal beams; And
Detecting unit is used for detecting by reproducing the described recorded information that waveform is formed in an image.
According to the present invention, a kind of hologram recording apparatus also is provided, be used for information is recorded as the diffraction grating zone of recording medium, this pen recorder comprises:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
The signal beams generation unit comprises spatial light modulator, and described spatial light modulator is modulated described reference beam according to described information space to be recorded, to produce signal beams; And
Interference unit, comprise illuminating optical system, be used to utilize signal beams irradiation recording medium, allowing this signal beams to enter and pass described recording medium, described illuminating optical system forms the diffraction grating zone according to light interference pattern in the part that the zero order beam and the diffracted beam of described recording medium internal signal light beam interferes with each other.
According to the present invention, a kind of hologram reproduction apparatus also is provided, be used for reproducing the information that is recorded as recording medium diffraction grating zone, this hologram reproduction apparatus comprises:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
Illumination unit comprises illuminating optical system, is used to utilize reference beam irradiation recording medium, enters and pass diffraction grating zone in this recording medium to allow this reference beam, to produce the reproduction ripple corresponding to signal beams; And
Detecting unit is used for detecting by reproducing the described recorded information that waveform is formed in an image.
According to the present invention, another kind of holographic recording and transcriber also are provided, be used for information is recorded as the diffraction grating zone of recording medium, and be used for reproducing described recorded information from described diffraction grating zone, described holographic recording and transcriber comprise:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
The signal beams generation unit comprises spatial light modulator, and described spatial light modulator is modulated described reference beam according to described information space to be recorded, to produce signal beams;
Interference unit, comprise illuminating optical system, be used to utilize signal beams irradiation recording medium, to allow this signal beams to enter and pass described recording medium, described illuminating optical system forms the diffraction grating zone according to light interference pattern in the zero order beam of the signal beams of described recording medium inside and part that diffracted beam interferes with each other, described illuminating optical system utilizes described reference beam to shine described diffraction grating zone, to produce the reproduction ripple corresponding to signal beams;
The incident beam treatment region, be arranged in the described recording medium, be positioned on the opposite side that signal beams incides the recording medium plane of incidence, this incident beam treatment region is separated from each other zero order beam and diffracted beam, so that a part of incident beam turns back to described recording medium inside; And
Detecting unit is used for detecting by reproducing the described recorded information that waveform is formed in an image.
According to the present invention, another kind of hologram recording apparatus also is provided, be used for information is recorded as the diffraction grating zone of recording medium, comprising:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
The signal beams generation unit comprises spatial light modulator, and described spatial light modulator is modulated described reference beam according to described information space to be recorded, to produce signal beams;
Interference unit, comprise illuminating optical system, be used to utilize signal beams irradiation recording medium, allowing this signal beams to enter and pass described recording medium, described illuminating optical system forms the diffraction grating zone according to light interference pattern in the zero order beam of the signal beams of described recording medium inside and part that diffracted beam interferes with each other; And
The incident beam treatment region, be arranged in the described recording medium, be positioned on the opposite side that signal beams incides the recording medium plane of incidence, this incident beam treatment region is separated from each other zero order beam and diffracted beam, so that a part of incident beam turns back to described recording medium inside.
According to the present invention, another kind of hologram reproduction apparatus further is provided, be used for reproducing the information in the diffraction grating zone that is recorded as recording medium, this hologram reproduction apparatus comprises:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
Illumination unit comprises illuminating optical system, is used to utilize reference beam irradiation recording medium, enters and pass diffraction grating zone in this recording medium to allow this reference beam, to produce the reproduction ripple corresponding to signal beams;
The incident beam treatment region, be arranged in the described recording medium, be positioned on the opposite side that signal beams incides the recording medium plane of incidence, this incident beam treatment region is separated from each other zero order beam and diffracted beam, so that a part of incident beam turns back to described recording medium inside; And
Detecting unit is used for detecting by reproducing the described recorded information that waveform is formed in an image.
The accompanying drawing summary
Fig. 1 is the synoptic diagram that shows the structure of conventional holographic recording and playback system;
Fig. 2 is the schematic sectional view of holographic recording medium according to an embodiment of the invention;
Fig. 3 be show according to an embodiment of the invention holographic recording and the synoptic diagram of the structure of transcriber;
Fig. 4 is used to illustrate by the holographic recording of this embodiment of the present invention and the schematic sectional view of transcriber executive logging process;
Fig. 5 is the schematic sectional view for the holographic recording medium that uses in the embodiment of the present invention;
Fig. 6 is used to illustrate the schematic plan view that concerns between the holographic recording medium of this embodiment of the present invention and the spatial light modulator;
Fig. 7 is the perspective schematic view that is used to illustrate by holographic recording of the present invention and transcriber executive logging process;
Fig. 8 is used to illustrate the schematic sectional view of carrying out the reproduction process by the holographic recording and the transcriber of the embodiment of the present invention;
Fig. 9 and 10 is used to illustrate the holographic recording of the improvement embodiment by the embodiment of the present invention and the schematic sectional view of transcriber executive logging process;
Figure 11 be show according to another embodiment of the invention holographic recording and the synoptic diagram of the structure of transcriber;
Figure 12 is used to illustrate by the holographic recording of this embodiment of the present invention and the schematic sectional view of transcriber executive logging process;
Figure 13 is the schematic sectional view for the holographic recording medium that uses in the embodiment of the present invention;
Figure 14 is used to illustrate the schematic sectional view of carrying out the reproduction process by the holographic recording and the transcriber of the embodiment of the present invention;
Figure 15 to 17 is used to illustrate the holographic recording of the improvement embodiment by the embodiment of the present invention and the schematic sectional view of transcriber executive logging process;
Figure 18 be show according to another embodiment of the invention holographic recording and the synoptic diagram of the structure of transcriber;
Figure 19 is used to illustrate the schematic plan view that concerns between the holographic recording medium of this embodiment of the present invention and the spatial light modulator;
Figure 20 is the perspective schematic view that is used to illustrate by holographic recording of the present invention and transcriber executive logging process;
Figure 21 and 22 is used to illustrate the holographic recording of the improvement embodiment by another embodiment of the present invention and the schematic sectional view of transcriber executive logging process;
Figure 23 be show according to another embodiment of the invention holographic recording and the synoptic diagram of the structure of transcriber;
Figure 24 to 26 is used to illustrate the holographic recording of the improvement embodiment by other embodiments of the present invention and the schematic sectional view of transcriber executive logging process;
Figure 27 shows to be used for the present invention's perspective schematic view of the device of the incident beam treatment region of the holographic recording of an embodiment and transcriber again;
Figure 28 shows according to the present invention the perspective schematic view of the recording medium disk cartridge of the holographic recording of an embodiment and transcriber again.
Detailed Description Of The Invention
Describe each embodiment of the present invention hereinafter with reference to the accompanying drawings.
In recording process, the present invention does not have to use the reference beam that is provided by another light path.The substitute is, only signal beams incides on the recording medium, and record is by the zero order beam and the formed refractive-index grating of the interference between the diffracted beam of signal beams.Afterwards, by only shining refractive-index grating, reproduce ripple and from refractive-index grating, reproduce and make with reference beam.Incident beam treatment region integral body is arranged on the opposite side of the plane of incidence that light beam incides in the recording medium.The incident beam treatment region is separated from each other the zero order beam of light beam and the diffracted beam of light beam, thereby a part of incident beam is turned back to recording medium inside.
＜the first embodiment 〉
Fig. 3 illustrates according to the holographic recording of an embodiment and transcriber.In this device, the near infrared laser that for example will have DBR (distributed Bragg reflector) laser instrument of 850nm wavelength is used as light source 11.Shutter SH, beam expander BX, spatial light modulator SLM, beam splitter 15 and collector lens 160 place the light path of reference beam 12.Shutter SH is by controller 32 controls, and control bundle is shone the irradiation time of recording medium.
Beam expander BX increases the diameter of the light beam 12 that passes shutter SH.Parallel beam 12 incides on the spatial light modulator SLM.Spatial light modulator SLM according to the electronic data that receives from scrambler 25, shows bright and dim spot battle array signal.Electronic data is expressed as and the corresponding a series of pages of unit of two dimension page or leaf.Pass in the process of spatial light modulator SLM of video data at reference beam, reference beam is modulated to optically the signal beams 12a that comprises as the data of dot matrix component.160 pairs of collector lenses pass the dot matrix component of the signal beams 12a of beam splitter 15 and carry out Fourier transform, and it is assembled, thereby make signal beams 12a arrive the focus of mounted recording medium 10 back.When shutter SH opens, signal beams 12a or reference beam 12 because of collector lens 160 with predetermined incident angle, for example zero degree incides on the first type surface (principal surface) of recording medium 10.Beam splitter 15 is separative elements, will reproduce ripple (back description) and separate from the light path of reference beam, supplies with the photodetector 20 of electrooptical device as CCD thereby will reproduce ripple.This spatial light modulator SLM and CCD 20 place on the focus of collector lens 160.
In addition, beam splitter 15 places the position that the reproduction ripple can be sent to CCD 20.CCD20 links to each other with demoder 26.Demoder 26 links to each other with controller 32.Consideration will join the situation of recording medium 10 in advance corresponding to the information of photorefractive crystal type, in the time of on recording medium 10 is installed in as the translational table 60 of the retaining part of movable recording media 10, controller 32 utilizes right sensors to read this information automatically, thereby moving of controlling recording medium 10, and carry out record and the reproduction that is suitable for recording medium 10.
With reference to figure 3, recording medium 10 integral body are arranged on the opposite side of the plane of incidence with incident beam treatment region R, this incident beam treatment region R comprises the zero order beam treatment region R1 that the zero order beam among the signal beams 12a is passed, and the diffracted beam treatment region R2 that makes the diffracted beam reflection among the signal beams 12a.The incident beam treatment region R that is provided is used for the processing signals light beam.For example, incident beam treatment region R comprises and makes opening that zero order beam passes and the diffracted beam treatment region R2 that limits this opening.As long as zero order beam treatment region R1 has the effect that is different from diffracted beam treatment region R2, incident beam treatment region R is not limited to configuration recited above.Can replace opening for zero order beam treatment region configuration zero order beam absorbing material.In other words, the zero order beam treatment region R1 in incident beam treatment region R passes through zero order beam, or absorbs this zero order beam.
Operation in the recording process is described hereinafter.
Controller 32 shown in Fig. 3 is controlled the position of the translational table 60 of the medium 10 of holding the record, thereby makes target recording medium (objective recording medium) 10 move to the predetermined recording position.
Then, tracer signal is sent to spatial light modulator SLM from scrambler 25, spatial light modulator SLM shows and the corresponding concrete pattern of data to be recorded.
Then, open shutter SH, with reference beam 12 irradiation spatial light modulator SLM.Produce signal beams 12a in the reference beam 12 that carries out spatial modulation by spatial light modulator SLM, described spatial modulator SLM is according to information to be recorded display pattern thereon.Utilize the signal beams 12a irradiation recording medium 10 that produces, thus the opening entry process.
Describing in detail hereinafter utilizes signal beams 12a (i.e. zero order beam wherein and diffracted beam) to write down the process of refractive-index grating in recording medium.
As shown in Figure 4, signal beams 12a comprises zero order beam and the diffracted beam that experiences spatial modulation.The zero order beam of signal beams 12a has the wavefront that is not subjected to the constant shapes that any spatial modulation influences, and therefore it is called " hologram reference beam ".The diffracted beam of the signal beams 12a of experience spatial modulation is called " hologram signal beams ".Therefore, in record, signal beams 12a comprises hologram reference beam and hologram signal beams at least.
Because with signal beams 12a irradiation recording medium 10, so optical interference takes place in hologram reference beam and hologram signal beams each other, forms optical interference candy strip P1, thereby refractive-index grating P1 is recorded in the recording medium 10 because of photorefractive effect.
The zero order beam of signal beams 12a (being the hologram reference beam) passes the zero order beam treatment region R1 of incident beam treatment region R, and the opposite side of signal beams 12a incident from the recording medium 10 penetrates.The diffracted beam of signal beams 12a (being the hologram signal beams) reflects back into recording medium 10 by the diffracted beam treatment region R2 of incident beam treatment region R.Therefore, the diffracted beam of the signal beams 12a that diffracted beam treatment region R2 is reflected is called " the hologram signal beams of reflection ".
Optical interference takes place in the hologram signal beams and the hologram reference beam of reflection each other in recording medium 10, form optical interference bar graph P2, thereby will be recorded in the recording medium 10 corresponding to the refractive-index grating P2 of optical interference candy strip P2 because of photorefractive effect.
In this manner, in record, from zero order beam and the diffracted beam (being signal beams 12a) of spatial light modulator SLM, together with diffracted beam, in the recording medium 10 inner set that form three-dimensional interference figure from the reflection of diffracted beam treatment region R2.As shown in Figure 5, because of photorefractive effect will be corresponding to optical interference figure P1, the refractive-index grating P1 of P2, P2 is recorded in the recording medium 10 in the mode of hologram.
After the record of recording medium 10, the control by controller 32 is closed shutter SH.
When finishing record,, force recording medium 10 to move (along " y " direction of Fig. 3) for arriving signal light beam 12a another precalculated position with respect to recording medium 10 in the booking situation position of recording medium 10.Then, carry out next record after the program formerly.Can sequentially carry out record like this.
Fig. 6 illustrates along the optical axis of signal beams 12a from from observed recording medium placed side by side 10 of the direction of light source and spatial light modulator SLM.The zero order beam treatment region R1 of the incident beam treatment region R that is provided with on the opposite side of the plane of incidence in recording medium 10 has stipulated a track TR who plays the opening effect, mainly makes the zero order beam of signal beams 12a can pass this track, as shown in Figure 6.Track TR continues to extend to Fig. 6 " y " direction.A plurality of track TR can be provided off and on the form of wire.In this case, these a plurality of track TR can preserve the positional information of zero order beam treatment region R1 in recording medium 10.
Recording medium 10 and spatial light modulator SLM are oppositely arranged with respect to optical axis in such a way, that is, and and the bearing of trend D of track TR TRBearing of trend D with delegation in the picture element matrix of spatial light modulator SLM SLMBecome predetermined θ (θ ≠ 0) angle.In addition, also the bearing of trend of row of spatial light modulator slm pixel array can be used for angle setting between recording medium 10 and the spatial light modulator SLM.This structural reason that angle between recording medium 10 and the spatial light modulator SLM is provided with is as follows.
In general, spatial light modulator SLM shows the two-dimentional spot pattern that whether allows light to pass through each pixel according to information to be recorded in the recording process.Spatial light modulator SLM spatial modulation produces signal beams 12a by its reference beam that passes 12.Then, 160 couples of signal beams 12a of Fourier transform lens or collector lens carry out Fourier transform with irradiation recording medium 10, and form the some picture that is produced by zero order beam and diffracted beam on the FF of Fourier plane.
As shown in Figure 7, by the highest frequency component among the spatial light modulator SLM modulated signal light bundle 12a corresponding to diffraction according to its picture element matrix (spacing is " a ").According to the spatial modulation because of spatial light modulator SLM, 160 couples of signal beams 12a carry out Fourier transform by collector lens, occur the light intensity distributions spectrum about spatial frequency then on the FF of Fourier plane, as shown in Figure 7.
If utilize spatial frequency (1/a) based on the pel spacing of spatial light modulator SLM, the focal length (f) of the wavelength of signal beams 12a (λ) and Fourier transform lens (collector lens 160), can be expressed as follows at zero order beam on the FF of Fourier plane and the distance (d1) between the first order diffracted beam so: d1=(1/a) is (f) (λ).According to aforesaid equation, be example with following this situation, for example, the pixel interval of spatial light modulator is 10 μ m, the wavelength of signal beams 12a is 530nm, and focal length is 14mm, and the distance (d1) between zero order beam and the first order diffracted beam approximately is 750 μ m.Because by highest frequency component among the spatial light modulator SLM modulated signal light bundle 12a corresponding to the picture element matrix spacing, therefore corresponding to the some picture of this picture element matrix spacing, appear at Fourier plane FF go up with the some image distance of the zero order beam generation of signal beams 12a from farthest position.Therefore, on the FF of Fourier plane, the largest portion that the spectrum of the spatial frequency that is produced by spatial light modulator distributes, the zone that is arranged in zero order beam with signal beams 12a and is the center and drawn by first order diffracted beam follows with the pel spacing of column direction corresponding among described first order diffracted beam and the spatial light modulator SLM.
By with the bearing of trend D of the delegation of spatial light modulator slm pixel matrix SLMThe point that corresponding diffracted beam produced looks like to be included among the incident beam treatment region R among the FF of Fourier plane.Bearing of trend D as track TR TRBearing of trend D with delegation in the picture element matrix of spatial light modulator SLM SLMWhen becoming θ=0 jiao, with the capable bearing of trend D of spatial light modulator SLM with respect to the optical axis of the signal beams that intersects with their SLMOn the corresponding point of spatial frequency component look like to drop on the track TR.
Therefore with the capable bearing of trend D of spatial light modulator SLM SLMCorresponding diffracted beam can diffracted beam treatment district R2 reflection.Therefore, in the above-mentioned optical interference candy strip P2 that forms, do not exist the hologram signal beams of the reflection that is derived from signal beams 12a (with the capable bearing of trend D of spatial light modulator SLMCorresponding), therefore not can with the hologram reference beam generation optical interference of signal beams 12a.In other words, as the bearing of trend D of track TR TRBearing of trend D with delegation in the picture element matrix of spatial light modulator SLM SLMWhen becoming θ=0 jiao with respect to the optical axis of the signal beams that intersects with their, can in the refractive-index grating P2 of recording medium 10, not write down based on any information of the corresponding diffracted beam of capable bearing of trend of spatial light modulator SLM.
The low frequency component of information to be recorded is concentrated near the zero order beam, but certain (onpurpose) passes zero order beam.All the other diffracted beams that this embodiment utilizes a plurality of somes place around zero order beam to occur.
In order to effectively utilize diffracted beam, promptly, make zero order beam (being the hologram reference beam) the generation optical interference of hologram signal beams (corresponding) with the signal beams 12a of the reflection of signal beams 12a with the capable bearing of trend of spatial light modulator SLM, be oppositely arranged recording medium 10 and spatial light modulator SLM with respect to optical axis as follows, that is the bearing of trend D of track TR, TRBearing of trend D with delegation in the picture element matrix of spatial light modulator SLM (or row) SLMBecome predetermined θ (θ ≠ 0) angle.
Operation in the recording process is described hereinafter.
Controller 32 is controlled the position of the translational table 60 of the medium 10 of holding the record, and as shown in Figure 3, thereby makes target recording medium 10 move to the predetermined recording position.
Then,, the information that makes all pixels become pellucidity is delivered to spatial light modulator SLM from scrambler 25, the spatial light modulator SLM pattern that shows transparency for not to modulating by the reference beam 12 of spatial light modulator SLM spatial modulation.
Then, open shutter SH, shine spatial light modulator SLM to produce signal beams 12a with reference beam 12.Then with signal beams 12a irradiation recording medium 10.In this manner, start the reproduction process.Be noted that in the reproduction process therefore the pattern because spatial light modulator SLM shows transparency does not carry out spatial modulation to signal beams 12a.So less than the diffracted beam that produces because of spatial modulation, signal beams 12a includes only zero order beam (being the hologram reference beam) like this.
Describing in detail hereinafter utilizes signal beams 12a (being the hologram reference beam) to reproduce the process of refractive-index grating in recording medium.
As shown in Figure 8, according to record in used identical position and the corner condition of signal beams, make signal beams 12a (not carrying out spatial modulation, i.e. the hologram reference beam) irradiation recording medium 10.At this moment, therefore refractive-index grating P1 and P2 with in the signal beams 12a irradiation recording medium 10 send first from the refractive-index grating P1 corresponding to recorded information respectively and reproduce ripple, send second from refractive-index grating P2 and reproduce ripple.The opposite side of the signal beams 12a that passes zero order beam treatment region R1 plane of incidence of light beam incident from the recording medium 10 penetrates.Therefore, signal beams 12a does not turn back to collector lens 160, can not arrive photodetector 20 yet.This phenomenon helps to simplify the reproduction of recorded information.
The first reproduction ripple reflects back into recording medium 10 by the diffracted beam treatment region R2 of incident beam treatment region R, from the plane of incidence ejaculation of recording medium 10, and passes collector lens 160.Second reproduces the diffraction grating that light write down that utilizes diffracted beam treatment region R2 reflection in the comfortable recording process of wave source, from the plane of incidence ejaculation of recording medium 10, and passes collector lens 160.In this manner, at least the first and second reproduce the plane of incidence ejaculation of ripple from recording medium 10, and pass collector lens 160.
After the first and second reproduction ripples pass collector lens 160,, and on photodetector 20, form the image light dot pattern corresponding with recorded information by beam splitter 15 reflections.The photoreceptor of CCD 20 receives this image light dot pattern then, so that its spot pattern signal reverts to the electronic digit data-signal.Then, this digital data signal is delivered to demoder 26 to reproduce raw data.
Then, after the reproduction of the recorded information of booking situation position, close shutter SH by the control of controller 32.
Then, for arriving signal light beam 12a another booking situation position, force recording medium 10 to move (along " y " direction of Fig. 3) with respect to recording medium 10.Then, follow previous program and carry out next one reproduction.Can sequentially reproduce like this.
＜the second embodiment 〉
Fig. 9 shows another improved embodiment of this embodiment.Incident beam treatment region R comprises diffracted beam treatment region R2, and it is arranged on the opposite side of the plane of incidence in the recording medium 10, and zero order beam fringe area SC, and it is arranged on recording medium 10 inside along track.The zero order beam that zero order beam fringe area SC plays incident light separates with its diffracted beam, and a part of light beam is turned back to the effect of another zero order beam treatment region R1 of recording medium 10 inside.Zero order beam fringe area SC is with the zero order beam scattering of signal beams 12a.The orbit-shaped zero order beam fringe area SC that edge " y " direction is extended sends back to the zero order beam of signal beams 12a in the recording medium 10.By means of the zero order beam of scattering, the zero order beam of incident, the interference fringe that the diffracted beam of incident and the diffracted beam of reflection form is carried out holographic recording.
In other words, the incident beam treatment region R of recording medium 10 comprise make signal beams 12a zero order beam (promptly, the hologram reference beam) the zero order beam fringe area SC of scattering, and the diffracted beam treatment region R2 that makes diffracted beam (being the hologram signal beams) reflection.Zero order beam fringe area SC continues to extend to Fig. 9 " y " direction as track.A plurality of zero order beam fringe area SC can be provided off and on the form of wire.In this case, zero order beam fringe area SC can preserve the positional information of zero order beam treatment region R1 in recording medium 10.
The process of utilizing signal beams 12a (being hologram reference beam and hologram signal beams) to write down refractive-index grating in recording medium is described below.
Because with signal beams 12a irradiation recording medium 10, so optical interference takes place in hologram reference beam and hologram signal beams each other, produces optical interference bar graph P1, thereby refractive-index grating P1 is recorded in the recording medium 10 because of photorefractive effect.
The zero order beam of signal beams 12a (that is hologram reference beam) is got back to recording medium 10 by the zero order beam fringe area SC scattering of incident beam treatment region R.Therefore the zero order beam with this scattering of signal beams 12a is called " the hologram reference beam of scattering ".The diffracted beam of signal beams 12a (that is, the hologram signal beams) is reflected back by the diffracted beam treatment region R2 of incident beam treatment region R, incides recording medium 10 with the hologram signal beams as reflection.
The hologram signal beams of the reflection of signal beams 12a and hologram reference beam, optical interference takes place in recording medium 10 each other, form optical interference candy strip P2, thereby in recording medium 10, write down refractive-index grating P2 because of photorefractive effect corresponding to optical interference candy strip P2.
Optical interference takes place in the hologram reference beam of the scattering of signal beams 12a and hologram signal beams each other in recording medium 10, form optical interference candy strip P3, thereby writes down refractive-index grating P3 because of photorefractive effect in recording medium 10.
Optical interference takes place in the hologram reference beam of the scattering of signal beams 12a and the hologram signal beams of reflection each other in recording medium 10, form optical interference candy strip P4, thereby writes down refractive-index grating P4 because of photorefractive effect in recording medium 10.
Therefore, in the embodiment shown in Fig. 9, because of photorefractive effect at least in recording medium 10 mode with holography write down corresponding to optical interference candy strip P1 P2, refractive-index grating P1, P2, P3 and the P4 of P3 and P4.
Describing hereinafter utilizes signal beams 12a (being the hologram reference beam) to reproduce the process of refractive-index grating in recording medium.
In the reproduction process, therefore the pattern because spatial light modulator SLM shows transparency does not carry out spatial modulation to signal beams 12a.So less than the diffracted beam that produces because of spatial modulation, signal beams 12a includes only zero order beam like this.
According to record in used identical position and the corner condition of signal beams, utilize signal beams 12a (not carrying out spatial modulation, i.e. the hologram reference beam) irradiation recording medium 10.At this moment, therefore refractive-index grating P1 and P2 with in the signal beams 12a irradiation recording medium 10 send first from the refractive-index grating P1 corresponding to recorded information respectively and reproduce ripple, send second from refractive-index grating P2 and reproduce ripple.Then, the zero order beam fringe area SC by incident beam treatment region R gets back to recording medium 10 with signal beams 12a (that is, the hologram reference beam) scattering, and becomes the hologram reference beam of scattering.Therefore refractive-index grating P3 and refractive-index grating P4 owing in the hologram reference beam irradiation recording medium 10 that utilizes scattering send the 3rd from the refractive-index grating P3 corresponding to recorded information and reproduce ripple, send the 4th from refractive-index grating P4 and reproduce ripple.
The hologram reference beam of scattering penetrates from the plane of incidence of recording medium 10, and a part of light beam passes collector lens 160.But because scattering, the hologram reference beam of scattering can be received by photodetector 20 hardly.This phenomenon helps to simplify the reproduction of recorded information.
Be derived from the first and the 3rd of diffracted beam composition and reproduce ripple and reflect back into recording medium 10, penetrate from the plane of incidence of recording medium 10, and pass collector lens 160 by the diffracted beam treatment region R2 of incident beam treatment region R.The second and the 4th reproduces the diffracted beam composition that is reflected by diffracted beam treatment region R2 in the comfortable recording process of wave source, from the plane of incidence ejaculation of recording medium 10, and passes collector lens 160.In this manner, at least first, second, third and the 4th reproduces the plane of incidence ejaculation of ripple from recording medium 10, and passes collector lens 160.Carry out the process of back according to the mode identical with embodiment among Fig. 3.
＜the three embodiment 〉
Figure 10 illustrates the further improved embodiment of this embodiment.The incident beam treatment region comprises diffracted beam treatment region R2, and it is arranged on the opposite side of the plane of incidence in the recording medium 10, and zero order beam deflecting region RL, and it is arranged on recording medium 10 inside along track.Zero order beam deflecting region RL has and is used to make the sloping reflecter of the zero order beam of signal beams 12a with respect to the optical axis direction interior deflector of signal beams 12a.Zero order beam deflecting region RL plays the effect of another zero order beam treatment region R1, and the zero order beam that is about to incident light separates with diffracted beam, and a part of light beam is turned back to recording medium 10 inside.Under the situation of changeing towards track one lateral deviation, the orbit-shaped zero order beam deflecting region RL that edge " y " direction is extended turns back to recording medium 10 with the zero order beam of signal beams 12a.By means of zero order beam by deflection, the zero order beam of incident, the interference fringe that the diffracted beam of incident and the diffracted beam of reflection form is carried out holographic recording.According to above-mentioned two improved embodiment,, therefore can effectively utilize the amount of irradiates light because signal beams and diffracted beam all turn back to the inside of recording medium 10.
In other words, the incident beam treatment region R of recording medium 10 comprise make signal beams 12a zero order beam (promptly, the hologram reference beam) the zero order beam deflecting region RL of deflection, and the diffracted beam treatment region R2 that makes diffracted beam (being the hologram signal beams) reflection.Zero order beam deflecting region RL continues to extend to Figure 10 " y " direction as track.A plurality of zero order beam deflecting region RL can be provided off and on the form of wire.In this case, zero order beam deflecting region RL can preserve the positional information of zero order beam treatment region R1 in recording medium 10.
The process of utilizing signal beams 12a (being hologram reference beam and hologram signal beams) to write down refractive-index grating in recording medium is described below.
Because with signal beams 12a irradiation recording medium 10, so optical interference takes place in hologram reference beam and hologram signal beams each other, produces optical interference candy strip P1, thereby refractive-index grating P1 is recorded in the recording medium 10 because of photorefractive effect.
The zero order beam of signal beams 12a (that is hologram reference beam) is by the zero order beam deflecting region RL deflection of incident beam treatment region R and reflect back into recording medium 10.Therefore this deflection of signal beams 12a and the zero order beam of reflection are called " the hologram reference beam of deflection ".The diffracted beam of signal beams 12a (that is, the hologram signal beams) is reflected back by the diffracted beam treatment region R2 of incident beam treatment region R, enters recording medium 10.
Optical interference takes place in the hologram signal beams of the reflection of signal beams 12a and hologram reference beam each other in recording medium 10, form optical interference candy strip P2, thereby in recording medium 10, write down refractive-index grating P2 because of photorefractive effect corresponding to optical interference candy strip P2.
Optical interference takes place in the hologram reference beam of the deflection of signal beams 12a and hologram signal beams each other in recording medium 10, form optical interference candy strip P3, thereby writes down refractive-index grating P3 because of photorefractive effect in recording medium 10.
Optical interference takes place in the hologram reference beam of the deflection of signal beams 12a and the hologram signal beams of reflection each other in recording medium 10, form optical interference candy strip P4, thereby writes down refractive-index grating P4 because of photorefractive effect in recording medium 10.
Therefore, in the embodiment shown in Figure 10, because of photorefractive effect, the mode with holography writes down corresponding to optical interference candy strip P1 in recording medium 10 at least, P2, refractive-index grating P1, P2, P3 and the P4 of P3 and P4.
Describing hereinafter utilizes signal beams 12a (being the hologram reference beam) to reproduce the process of refractive-index grating in recording medium.
In the reproduction process, therefore the pattern because spatial light modulator SLM shows transparency does not carry out spatial modulation to signal beams 12a.So less than the diffracted beam that produces because of spatial modulation, signal beams 12a includes only zero order beam like this.
According to record in used identical position and the corner condition of signal beams, utilize signal beams 12a (not carrying out spatial modulation, i.e. the hologram reference beam) irradiation recording medium 10.At this moment, therefore refractive-index grating P1 and P2 with in the signal beams irradiation recording medium 10 send first from refractive-index grating P1 respectively and reproduce ripple, send second from refractive-index grating P2 and reproduce ripple.Then, the zero order beam deflecting region RL by incident beam treatment region R is with signal beams 12a (being the hologram reference beam) deflection and reflect back into recording medium 10, becomes the hologram reference beam of deflection.Therefore refractive-index grating P3 and refractive-index grating P4 owing in the hologram reference beam irradiation recording medium 10 that utilizes deflection send the 3rd from the refractive-index grating P3 corresponding to recorded information and reproduce ripple, send the 4th from refractive-index grating P4 and reproduce ripple.
The hologram reference beam of deflection penetrates from the plane of incidence of recording medium 10, and a part of light beam passes collector lens 160.Interchangeable is to provide to prevent that light beam from turning back to the structure of collector lens 160 by changing the pitch angle shape of zero order beam deflecting region RL.Even a part of light beam turns back to collector lens 160, because deflection also is difficult to be received by photodetector 20.This phenomenon helps to simplify the reproduction of recorded information.
Be derived from the first and the 3rd of diffracted beam composition and reproduce ripple and reflect back into recording medium 10, penetrate from the plane of incidence of recording medium 10, and pass collector lens 160 by the diffracted beam treatment region R2 of incident beam treatment region R.The second and the 4th reproduces the diffracted beam composition that is reflected by diffracted beam treatment region R2 in the comfortable recording process of wave source, and its plane of incidence from recording medium 10 penetrates, and passes collector lens 160.In this manner, at least first, second, third and the 4th reproduces the plane of incidence ejaculation of ripple from recording medium 10, and passes collector lens 160.Carry out the process of back according to the mode identical with embodiment among Fig. 3.
According to above-mentioned two adjacent improved embodiment, because the zero order beam of signal beams 12a turns back to recording medium 10 inside through incident beam treatment region R, therefore can effectively utilize the amount of irradiates light, in addition, these structures help to simplify the reproduction of recorded information.
＜the four embodiment 〉
In the above-described embodiment, described the holographic recording and the reproduction of reflected version, wherein the diffracted beam treatment region R2 folded light beam of incident beam treatment region R still also can be utilized the transparent diffracted beam treatment region R2 with same effect in the present invention.
Figure 11 illustrates according to the holographic recording of another embodiment and transcriber, and the utilization of this device has the recording medium of zero order beam treatment region R1 and diffracted beam treatment region R2, and light beam can pass this recording medium, and promptly whole incident beam treatment region R is a printing opacity.The holographic recording of this embodiment is identical with device shown in Figure 1 with transcriber, just removed be used to produce reference beam by beam splitter 13, catoptron 18 and 19 optical systems of forming.Can make zero order beam treatment region R1 be suitable for being used for the track to the continuous extension of Figure 11 " y " direction of tracking servo.Can provide zero order beam treatment region R1 by following Processing Structure, promptly different with the transmissivity (or reflectivity or absorption coefficient) of diffracted beam treatment region R2 by making zero order beam treatment region R1, thus zero order beam and diffracted beam can be separated.
In record, shown in Figure 11 and 12, in recording medium 10, interfere with each other from zero order beam and the diffracted beam of the signal beams 12a of spatial light modulator SLM, produce the three-dimensional interference pattern.
Because with signal beams 12a irradiation recording medium 10, therefore optical interference takes place in hologram reference beam and hologram signal beams each other, produce optical interference candy strip P1, thereby because of photorefractive effect writes down refractive-index grating P1 in recording medium 10, as shown in figure 13.
The zero order beam of signal beams 12a (promptly, the hologram reference beam) passes the zero order beam treatment region R1 of incident beam treatment region R, and the diffracted beam of signal beams 12a (that is hologram signal beams) passes the diffracted beam treatment region R2 of incident beam treatment region R.
In the reproduction process, as shown in figure 14, under spatial light modulator SLM shows transparency the condition of pattern, signal beams 12a is not carried out spatial modulation, so signal beams 12a includes only zero order beam (being the hologram reference beam).According to record in used identical position and the corner condition of signal beams, utilize hologram reference beam irradiation recording medium 10.At this moment, therefore the refractive-index grating P1 with in the signal beams irradiation recording medium 10 sends first from the refractive-index grating P1 corresponding to recorded information and reproduces ripple.Because signal beams 12a only is zero order beam, so the opposite side of signal beams 12a plane of incidence of light beam incident from the recording medium 10 penetrates, and passes collector lens 16a.First reproduces ripple also penetrates from the opposite side of the plane of incidence of recording medium 10, and passes collector lens 16a.Therefore, first reproduce ripple at least in the reproduction process opposite side from the plane of incidence of recording medium 10 penetrate, and pass collector lens 16a.The first reproduction ripple helps to form the image information corresponding to recorded information on photodetector 20.The photoreceptor of CCD 20 receives this image information then, makes it revert to the electronic digit data-signal.Then, this digital data signal is delivered to demoder 26 to reproduce raw data.
In the embodiment depicted in fig. 11, preferably, recording medium 10 is made by photochromics, and described material has such characteristic, and promptly optical interference candy strip P1 launches a large amount of first light quantity of reproducing ripples, to improve the precision of the recorded information of reproducing.This is because of the photoreceptor while also received signal light beam 12a.
＜the five embodiment 〉
Figure 15 shows another improved embodiment of this embodiment.This embodiment is included in the zero order beam fringe area SC of opposite side upper edge track (" y " direction) setting of the plane of incidence in the recording medium 10, is used for the only zero order beam of scattered signal light beam 12a.Zero order beam fringe area SC plays the effect of zero order beam treatment region R1, that is, zero order beam and its diffracted beam of incident light separated, and a part of light beam is turned back to recording medium 10 inside.The orbit-shaped zero order beam fringe area SC that extends along " y " direction gets back to the zero order beam scattering of signal beams 12a in the recording medium 10.Utilize the zero order beam of incident, the interference fringe that the diffracted beam of incident and the zero order beam of scattering form is carried out holographic recording.
In other words, the incident beam treatment region R of recording medium 10 comprise make signal beams 12a zero order beam (promptly, the hologram reference beam) the zero order beam fringe area SC of scattering and the diffracted beam treatment region R2 that allows diffracted beam (being the hologram signal beams) to pass.Zero order beam fringe area SC continues to extend to Figure 15 " y " direction as track.A plurality of zero order beam fringe area SC can be provided off and on the form of wire.In this case, zero order beam fringe area SC can preserve the positional information of zero order beam treatment region R1 in recording medium 10.
The process of utilizing signal beams 12a (being hologram reference beam and hologram signal beams) to write down refractive-index grating in recording medium is described below.
Because with signal beams 12a irradiation recording medium 10, so optical interference takes place in hologram reference beam and hologram signal beams each other, produces optical interference candy strip P1, thereby writes down refractive-index grating P1 because of photorefractive effect in recording medium 10.
The zero order beam of signal beams 12a (that is, the hologram reference beam) is got back to recording medium 10 by the zero order beam fringe area SC scattering of incident beam treatment region R, and becomes the hologram reference beam of scattering.The diffracted beam of signal beams 12a (that is, the hologram signal beams) passes the diffracted beam treatment region R2 of incident beam treatment region R, and the opposite side of the plane of incidence of light beam incident penetrates from the recording medium 10.
Optical interference takes place in the hologram signal beams of the scattering of signal beams 12a and hologram reference beam each other in recording medium 10, form optical interference candy strip P2, thereby in recording medium 10, write down refractive-index grating P2 because of photorefractive effect corresponding to optical interference candy strip P2.
Therefore, in the embodiment depicted in fig. 15, because of photorefractive effect writes down refractive-index grating P1 and P2 corresponding to optical interference candy strip P1 and P2 at least in the mode of holography in recording medium 10.
Describing hereinafter utilizes signal beams 12a (being the hologram reference beam) to reproduce the process of refractive-index grating in recording medium.
In the reproduction process, therefore the pattern because spatial light modulator SLM shows transparency does not carry out spatial modulation to signal beams 12a.Therefore signal beams 12a includes only zero order beam.
Under the position and corner condition identical, utilize signal beams 12a (hologram reference beam) irradiation recording medium 10 with used signal beams in the record.At this moment, therefore the refractive-index grating P1 with in the signal beams irradiation recording medium 10 sends first from the refractive-index grating P1 corresponding to recorded information and reproduces ripple.
Zero order beam fringe area SC by incident beam treatment region R gets back to recording medium 10 with zero order beam (that is, the hologram reference beam) scattering of signal beams 12a, and becomes the hologram reference beam of scattering.Utilize the refractive-index grating P2 of the hologram reference beam irradiation recording medium 10 of scattering, therefore send second and reproduce ripple from refractive-index grating P2 corresponding to recorded information.
First and second reproduce the diffracted beam treatment region R2 that ripples pass incident beam treatment region R, and the opposite side of the plane of incidence of light beam incident penetrates from the recording medium 10, and passes collector lens 16a.Carry out the process of back according to the mode identical with embodiment among Figure 14.
Because the hologram reference beam of scattering penetrates from the plane of incidence of recording medium 10, because scattering, the hologram reference beam of scattering can be received by photodetector 20 hardly.This phenomenon helps to simplify the reproduction of recorded information.
＜the six embodiment 〉
Figure 16 shows another improved embodiment of this embodiment.The opposite side upper edge track of the plane of incidence only provides the zero order beam echo area RR with zero order beam reflected back recording medium 10 inside of signal beams 12a in recording medium 10.Zero order beam echo area RR plays the effect of zero order beam treatment region R1, that is, zero order beam and its diffracted beam of incident light separated, and a part of light beam is turned back to recording medium 10 inside.The orbit-shaped zero order beam echo area RR that extends along " y " direction makes the zero order beam of signal beams 12a turn back to the track of recording medium 10 by reflection.Utilize zero order beam, the interference fringe that the zero order beam of diffracted beam and reflection forms is carried out holographic recording.
In other words, the incident beam treatment region R of recording medium 10 comprises, be used for the zero order beam echo area RR of zero order beam (that is hologram reference beam) of reflected signal light beam 12a and the diffracted beam treatment region R2 that allows diffracted beam (being the hologram signal beams) to pass.Zero order beam echo area RR continues to extend to Figure 16 " y " direction as track.A plurality of zero order beams echo area RR can be provided off and on the form of wire.In this case, zero order beam echo area RR can preserve the positional information of zero order beam treatment region R1 in recording medium 10.
The process of utilizing signal beams 12a (being hologram reference beam and hologram signal beams) to write down refractive-index grating in recording medium is described below.
Because with signal beams 12a irradiation recording medium 10, so optical interference takes place in hologram reference beam and hologram signal beams each other, produces optical interference candy strip P1, thereby writes down refractive-index grating P1 because of photorefractive effect in recording medium 10.
The zero order beam of signal beams 12a (that is hologram reference beam) reflects back into recording medium 10 by the zero order beam echo area RR of incident beam treatment region R.Therefore will be called " the hologram reference beam of reflection " by this zero order beam of the signal beams 12a of zero order beam echo area RR reflection.The diffracted beam of signal beams 12a (that is, the hologram signal beams) passes the diffracted beam treatment region R2 of incident beam treatment region R, and the opposite side of the plane of incidence of light beam incident penetrates from the recording medium 10.
Optical interference takes place in the hologram reference beam of the reflection of signal beams 12a and hologram signal beams each other in recording medium 10, form optical interference candy strip P2, thereby in recording medium 10, write down refractive-index grating P2 because of photorefractive effect corresponding to optical interference candy strip P2.
Therefore, in embodiment shown in Figure 16, because of photorefractive effect writes down refractive-index grating P1 and P2 corresponding to optical interference candy strip P1 and P2 at least in the mode of hologram in recording medium 10.
Describing hereinafter utilizes signal beams 12a (being the hologram reference beam) to reproduce the process of refractive-index grating in recording medium 10.
In the reproduction process, signal beams 12a is not carried out spatial modulation.So less than the diffracted beam that produces because of spatial modulation, signal beams 12a includes only zero order beam like this.
Under the position and corner condition identical, utilize signal beams 12a (hologram reference beam) irradiation recording medium 10 with used signal beams in the record.At this moment, therefore the refractive-index grating P1 with in the signal beams irradiation recording medium 10 sends first from the refractive-index grating P1 corresponding to recorded information and reproduces ripple.
Then, the zero order beam echo area RR by incident beam treatment region R reflects back into recording medium 10 with signal beams 12a (that is, the hologram reference beam), and becomes the hologram reference beam of reflection.Utilize the refractive-index grating P2 of the hologram reference beam irradiation recording medium 10 of reflection, therefore send second and reproduce ripple from refractive-index grating P2 corresponding to recorded information.
First and second reproduce the diffracted beam treatment region R2 that ripples pass incident beam treatment region R, and the opposite side of the plane of incidence of light beam incident penetrates from the recording medium 10, and passes collector lens 16a.Carry out the process of back according to the mode identical with embodiment among Figure 14.
The hologram reference beam of reflection penetrates from the plane of incidence of recording medium 10, can not arrive collector lens 16a.This phenomenon helps to simplify the reproduction of recorded information.
＜the seven embodiment 〉
Figure 17 shows another improved embodiment of this embodiment.Opposite side upper edge track at the plane of incidence of recording medium 10 provides zero order beam deflecting region RL, is used for the zero order beam of the signal beams 12a interior deflector to recording medium 10.The zero order beam deflecting region RL that edge " y " direction is extended reflects back into recording medium 10 with the zero order beam of signal beams 12a, simultaneously zero order beam is changeed to track one lateral deviation.Utilization is by zero order beam, and the interference fringe that the zero order beam of diffracted beam and deflection forms is carried out holographic recording.Improve embodiment according to these of the record and the embodiment of transcriber, have only the zero order beam of signal beams to turn back to recording medium 10 inside, so can effectively utilize the amount of irradiates light.
In other words, the incident beam treatment region R of recording medium 10 comprises, make the zero order beam deflecting region RL of zero order beam (that is hologram reference beam) deflection of signal beams 12a and the diffracted beam treatment region R2 that allows diffracted beam (being the hologram signal beams) to pass.Zero order beam deflecting region RL continues to extend to Figure 17 " y " direction as track.A plurality of zero order beam deflecting region RL can be provided off and on the form of wire.In this case, zero order beam deflecting region RL can preserve the positional information of zero order beam treatment region R1 in recording medium 10.
The process of utilizing signal beams 12a (being hologram reference beam and hologram signal beams) to write down refractive-index grating in recording medium is described below.
Because with signal beams 12a irradiation recording medium 10, so optical interference takes place in hologram reference beam and hologram signal beams each other, produces optical interference candy strip P1, thereby writes down refractive-index grating P1 because of photorefractive effect in recording medium 10.
The zero order beam of signal beams 12a (that is, the hologram reference beam) is by the zero order beam deflecting region RL deflection of incident beam treatment region R and reflect back into recording medium 10, and becomes the hologram reference beam of deflection.The diffracted beam of signal beams 12a (that is, the hologram signal beams) passes the diffracted beam treatment region R2 of incident beam treatment region R, and the opposite side of the plane of incidence of light beam incident penetrates from the recording medium 10.
Optical interference takes place in the hologram reference beam of the deflection of signal beams 12a and hologram reference beam each other in recording medium 10, form optical interference candy strip P2, thereby in recording medium 10, write down refractive-index grating P2 because of photorefractive effect corresponding to optical interference candy strip P2.
Therefore, in embodiment shown in Figure 17, because of photorefractive effect writes down refractive-index grating P1 and P2 corresponding to optical interference candy strip P1 and P2 at least in the mode of hologram in recording medium 10.
Describing hereinafter utilizes signal beams 12a (that is hologram reference beam) to reproduce the process of refractive-index grating in recording medium 10.
In the reproduction process, signal beams 12a is not carried out spatial modulation.So less than the diffracted beam that produces because of spatial modulation, signal beams 12a includes only zero order beam like this.
Under the position and corner condition identical, utilize signal beams 12a (hologram reference beam) irradiation recording medium 10 with used signal beams in the record.At this moment, therefore the refractive-index grating P1 with in the signal beams irradiation recording medium 10 sends first from the refractive-index grating P1 corresponding to recorded information and reproduces ripple.
Then, the zero order beam deflecting region RL by incident beam treatment region R gets back to recording medium 10 with zero order beam (that is, the hologram reference beam) deflection of signal beams 12a, and becomes the hologram reference beam of deflection.Utilize the refractive-index grating P2 of the hologram reference beam irradiation recording medium 10 of deflection, therefore send second and reproduce ripple from refractive-index grating P2 corresponding to recorded information.
First and second reproduce the diffracted beam treatment region R2 that ripples pass incident beam treatment region R, and the opposite side of the plane of incidence of light beam incident penetrates from the recording medium 10, and passes collector lens 16a.Carry out the process of back according to the mode identical with embodiment among Figure 14.
The hologram reference beam of deflection penetrates from the plane of incidence of recording medium 10, can not arrive collector lens 16a.This phenomenon helps to simplify the reproduction of recorded information.
According to above-mentioned these improved embodiment, owing to have only the zero order beam of signal beams 12a to turn back to the inside of recording medium 10 through incident beam treatment region R, therefore can effectively utilize the amount of irradiates light, in addition, these structures help to simplify the reproduction of recorded information.
＜the eight embodiment 〉
In the above-described embodiment, described the holographic recording and the reproduction of the form in the recording medium 10 that is arranged on incident beam treatment region R integral body, but also can provide this incident beam treatment region R to having with the device of the identical beneficial effect of the present invention.
Figure 18 illustrates holographic recording and the transcriber according to the another kind of recording medium of utilization of another embodiment.This holographic recording and transcriber include irradiating light beam treatment region R, and this incident beam treatment region places on the recording medium 10 or contiguous recording medium 10, and are positioned at the opposite side of the plane of incidence of signal beams incident.Incident beam treatment region R is separated from each other zero order beam and diffracted beam, so that a part of incident beam turns back to the inside of recording medium.Incident beam treatment region R comprises, the zero order beam treatment region R1 that the zero order beam among the signal beams 12a is passed through, and the diffracted beam treatment region R2 that makes the diffracted beam reflection among the signal beams 12a.As long as the processing capacity of zero order beam treatment region R1 is different from the processing capacity of diffracted beam treatment region R2, zero order beam treatment region R1 can have the function that absorbs zero order beam.Zero order beam treatment region R1 can have light transmission or light absorptive.Except that incident beam treatment region R places the device of contiguous recording medium 10, the holographic recording shown in Figure 18 is identical with the device shown in Fig. 3 with transcriber.
As shown in Figure 19, in this device, incident beam treatment region R places the opposite side of the plane of incidence of recording medium 10, and has the zero order beam treatment region R1 that the zero order beam of signal beams 12a is passed of being used for as a window.Recording medium 10 is configured to movably, so that can move with respect to " y " direction among the windowsill figure of zero order beam treatment region R1.Recording medium 10 is provided with movably, so as along with the bearing of trend D of the delegation of spatial light modulator slm pixel matrix or row SLMBecome the direction D of predetermined angle θ (θ ≠ 0) TRMove.
As shown in figure 20, diffracted beam becomes the highest frequency component based on its picture element matrix (spacing is " a ") modulated signal light bundle 12a of institute by spatial light modulator SLM.Signal beams 12a carries out Fourier transform by collector lens 160, then according to the spatial modulation because of spatial light modulator SLM, the spectrum distribution about the light intensity of spatial frequency occurs in the FF of Fourier plane, as shown in figure 20.
This embodiment, except incident beam treatment region R and recording medium 10 can relatively move, the record of its hologram was identical with the device shown in Fig. 3 with the reproduction process.
＜the nine embodiment 〉
In addition, Figure 21 illustrates another improved embodiment.Replace the transparent part of zero order beam treatment region, provide zero order beam fringe area SC among the incident beam treatment region R on the opposite side of recording medium 10 planes of incidence.By means of zero order beam, diffracted beam, the zero order beam of scattering and the formed interference fringe of the diffracted beam of reflection are carried out holographic recording.
＜the ten embodiment 〉
Figure 22 illustrates the further improved embodiment of this embodiment.In the incident beam treatment region R of the opposite side of the plane of incidence or contiguous this opposite side, provide zero order beam deflecting region RL.This zero order beam deflecting region RL has the zero order beam that the makes signal beams 12a sloping reflecter with respect to the optical axis direction interior deflector of signal beams 12a.Zero order beam deflecting region RL plays the effect of another zero order beam treatment region R1, that is, the zero order beam and the diffracted beam of incident light separated, and a part of light beam is turned back to recording medium 10 inside.By means of by zero order beam, diffracted beam, the zero order beam of deflection and the formed interference fringe of the diffracted beam of reflection are carried out holographic recording.
＜the ten one embodiment 〉
Figure 23 illustrates another holographic recording and the transcriber according to another embodiment, and this device uses transparent diffracted beam treatment region R2, and light beam can pass this diffracted beam treatment region R2 among the incident beam treatment region R.This holographic recording is identical with the device shown in Fig. 1 with transcriber, except being added to irradiating light beam treatment region R and removing by beam splitter 13, catoptron 18 and 19 optical systems of forming that are used to produce reference beam.In addition, incident beam treatment region R comprises, is used to make the zero order beam fringe area SC of zero order beam scattering and the transparent part T (diffracted beam treatment region R2) that allows diffracted beam to pass through.
As shown in figure 24, in this device, be positioned at the opposite side of recording medium 10 planes of incidence, provide zero order beam fringe area SC in incident beam treatment region R inside, make this incident beam treatment region R the zero order beam of incident light can be separated with its diffracted beam, and a part of light beam is turned back to recording medium 10 inside.This zero order beam fringe area SC is the zero order beam of scattered signal light beam 12a only.Orbit-shaped zero order beam fringe area SC along " y " direction is extended gets back to the zero order beam scattering of signal beams 12a in the recording medium 10.By means of by the zero order beam that produces the optical interference candy strip, diffracted beam, the zero order beam of scattering and the formed interference fringe of the diffracted beam of reflection are carried out holographic recording, thereby write down refractive-index grating because of photorefractive effect in recording medium 10.In reproduction, according to mode same in record, recording medium 10 is fixed in the device, and reference beam 12 these recording mediums 10 of irradiation of utilize assembling.When reference beam 12 passes recording medium 10, reproduce ripple from the refractive-index grating output of recording medium 10 so.When reference beam 12 incidents, the reconstruction beam of the light interference pattern of record appears being used on the opposite side of recording medium 10 reproducing so.To reproduce ripple and guide to inverse Fourier transform lens 16a and carry out inverse Fourier transform, thus playback light dot pattern signal.By placing the photodetector 20 such as charge coupled device ccd etc. of focal position, receive the spot pattern signal, and it is reverted to electric digital data signal.Then, this digital data signal is sent to demoder to reproduce raw data.
＜the ten two embodiment 〉
Figure 25 illustrates the part of another improved embodiment.This holographic recording is identical with the device shown in Figure 23 with transcriber, except be provided with in inside only the zero order beam echo area RR and the transparent part T (diffracted beam treatment region R2) that allows diffracted beam to pass of the zero order beam of reflected signal light beam 12a in this device.
In other words, the incident beam treatment region R of contiguous recording medium 10 comprises, be used to make the zero order beam echo area RR and the diffracted beam treatment region R2 that allows diffracted beam (that is hologram signal beams) to pass of zero order beam (that is hologram the reference beam) reflection of signal beams 12a.
＜the ten three embodiment 〉
Figure 26 illustrates the part of another improved embodiment.This holographic recording is identical with the device shown in Figure 23 with transcriber, except be provided with in inside only the zero order beam deflecting region RL and the transparent part T (diffracted beam treatment region R2) that allows diffracted beam to pass of the zero order beam of reflected signal light beam 12a in this device.Zero order beam deflecting region RL along the incident beam treatment region of " y " direction extension among the figure, zero order beam is changeed towards a lateral deviation of the track of recording medium 10 inside, thereby by means of by zero order beam, the formed interference fringe of the zero order beam of diffracted beam and deflection is carried out holographic recording.This zero order beam deflecting region RL has the reflecting surface with respect to the inclined light shaft of signal beams 12a, is used to make the zero order beam of signal beams 12a to interior deflector.Zero order beam deflecting region RL plays the effect of another zero order beam treatment region R1, that is, the zero order beam and the diffracted beam of incident light separated, and a part of light beam is turned back to recording medium 10 inside.The orbit-shaped zero order beam deflecting region RL that edge " y " direction is extended turns back to recording medium 10 with the zero order beam of signal beams 12a, and changes towards track one lateral deviation.By means of by zero order beam, diffracted beam, the zero order beam of deflection and the formed interference fringe of the diffracted beam of reflection are carried out holographic recording.
These improved embodiment have the structure that only zero order beam of signal beams is turned back to recording medium 10 inside, thereby can effectively utilize the amount of irradiates light.The incident beam treatment region has the separating incident light bundle, so that its part is turned back to recording medium inside, thereby utilizes the zero order beam in the different process individual processing incident lights and the effect of diffracted beam.Therefore the incident beam treatment region can have: allow zero order beam to pass through or absorb the zero order beam treatment region of zero order beam; And the diffracted beam echo area of reflection or deflection or scattering diffracted beam.Interchangeable is that the incident beam treatment region can have reflection or scattering or deflection or absorb the zero order beam treatment region of zero order beam; And the diffracted beam echo area of reflection or deflection diffracted beam.
＜the ten four embodiment 〉
Figure 27 illustrates the part of another improved embodiment, compares with the device shown in Figure 18, sets into irradiating light beam treatment region R separately in the position of contiguous recording medium 10.As shown in Figure 27, incident beam treatment region R and collector lens 160 can integrally be fixed on bracing frame R SUOn, face with each other, thereby recording medium 10 can be inserted between them.
＜the ten five embodiment 〉
And, according to another embodiment of the present invention, can provide the recording medium 10 of dish type or card shape.For example, disk cartridge CR shown in Figure 28 holds the disk of rotatable recording medium 10.Disk cartridge CR sidewall within it has incident beam treatment region R, and has the opening with light beam access record media disks.
＜the ten six embodiment 〉
Except the above-mentioned embodiment of holographic recording and reproducting method and device thereof, the present invention obviously comprises the recording method of hologram, reproducting method, pen recorder and transcriber.In the above-described embodiment, come the spatial modulation laser beam, in other words, utilize two-dimensional modulation according to 2-D data.But the present invention also is applicable to holographic recording and reproducting method and the device that comes the spatial modulation laser beam according to one-dimensional data.In the above-described embodiment, light refraction material is used for the photochromics of recording medium, and still as the photochromics of hole burning material, photochromic material etc. also can be used for the photochromics of recording medium.

Claims (86)

1. method that is used for holographic recording and reproduction, this method comprises recording process and reproduction process,
This recording process comprises step:
According to information to be recorded,, produce signal beams by spatial modulation coherent reference light beam;
Recording medium with this signal beams irradiation is made by photochromics passes described recording medium to allow this signal beams; And
Part in that the zero order beam that is arranged in this signal beams and diffracted beam interfere each other in described recording medium inside produces the diffraction grating zone by the light interference pattern record; And
The reproduction process may further comprise the steps:
Shine described diffraction grating zone with described reference beam, to produce reproduction ripple corresponding to this signal beams.
2. according to the method that is used for holographic recording and reproduction of claim 1, further comprise an incident beam treatment region, it is arranged in the described recording medium, be positioned on the opposite side of the plane of incidence that described signal beams incides described recording medium, this incident beam treatment region is separated from each other this zero order beam and this diffracted beam, so that this incident beam of a part is turned back to described recording medium inside.
3. according to the method that is used for holographic recording and reproduction of claim 2, further be included in the linear track that forms in the part of described incident beam treatment region.
4. according to the method that is used for holographic recording and reproduction of claim 3, wherein said track has the locating information of described incident beam treatment region with respect to described recording medium.
5. according to the method that is used for holographic recording and reproduction of claim 2, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region allows this zero order beam to pass, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and reflects this diffracted beam.
6. according to the method that is used for holographic recording and reproduction of claim 2, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits the zero order beam treatment region and allows this diffracted beam to pass.
7. according to the method that is used for holographic recording and reproduction of claim 2, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or allowing zero order beam to pass, this diffracted beam echo area limits this zero order beam treatment region and absorbs this diffracted beam.
8. according to the method that is used for holographic recording and reproduction of each claim in the claim 5 to 7, further comprise spatial light modulator, this spatial light modulator comprises the row and column matrix of pixel, with the described reference beam of spatial modulation, wherein, described spatial light modulator and described recording medium are set relatively according to making the diffracted beam of described signal beams can not shine the mode of described zero order beam treatment region.
9. the method that is used for holographic recording and reproduction according to Claim 8, described spatial light modulator and described recording medium relatively are provided with respect to the optical axis of described signal beams, that is, make θ (θ ≠ 0) angle that bearing of trend and a bearing of trend of described zero order beam treatment region of the delegation of described spatial light modulator or row become to be scheduled to.
10. according to the method that is used for holographic recording and reproduction of claim 6, wherein in described reproduction process, the opposite side that incides the plane of incidence of described recording medium from signal beams is exported described reproduction ripple.
11. a method that is used for holographic recording comprises step:
According to information to be recorded,, produce signal beams by spatial modulation coherent reference light beam;
The recording medium that utilizes this signal beams irradiation to be made by photochromics passes described recording medium to allow signal beams; And
Part in that the zero order beam that is arranged in this signal beams and diffracted beam interfere each other in described recording medium inside produces the diffraction grating zone by the light interference pattern record.
12. the method that is used for recorded hologram according to claim 11, further comprise an incident beam treatment region, it is arranged in the described recording medium, be positioned on the opposite side of the plane of incidence that described signal beams incides described recording medium, this incident beam treatment region is separated from each other this zero order beam and this diffracted beam, so that this incident beam of a part is turned back to described recording medium inside.
13., further be included in the linear track that forms in the part of described incident beam treatment region according to the method that is used for recorded hologram of claim 12.
14. according to the method that is used for recorded hologram of claim 13, wherein said track has the locating information of described incident beam treatment region with respect to described recording medium.
15. the method that is used for recorded hologram according to claim 12, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region allows this zero order beam to pass, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and reflects this diffracted beam.
16. the method that is used for recorded hologram according to claim 12, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and allows this diffracted beam to pass.
17. the method that is used for recorded hologram according to claim 12, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or allowing this zero order beam to pass, this diffracted beam echo area limits this zero order beam treatment region and absorbs this diffracted beam.
18. the method that is used for recorded hologram according to each claim in the claim 15 to 17, further comprise spatial light modulator, this spatial light modulator comprises the row and column matrix of pixel, with the described reference beam of spatial modulation, wherein, described spatial light modulator and described recording medium are set relatively according to making the diffracted beam of described signal beams can not shine the mode of described zero order beam treatment region.
19. the method that is used for recorded hologram according to claim 18, described spatial light modulator and described recording medium relatively are provided with respect to the optical axis of described signal beams, that is, make θ (θ ≠ 0) angle that bearing of trend and a bearing of trend of described zero order beam treatment region of the delegation of described spatial light modulator or row become to be scheduled to.
20. a method that is used for the reconstruction of hologram may further comprise the steps:
The recording medium of being made by photochromics is provided, and it has the diffraction grating zone that forms by recording process, and this recording process comprises step: according to information to be recorded, produce signal beams by spatial modulation coherent reference light beam; Utilize this signal beams to shine this recording medium, to allow this signal beams to pass described recording medium, so that the part in that the zero order beam that is arranged in this signal beams and diffracted beam interfere each other in described recording medium inside forms this diffraction grating zone by the light interference pattern record; And
The coherent reference light beam is shone this diffraction grating zone, to produce reproduction ripple corresponding to this signal beams.
21. the method that is used for reconstructing hologram according to claim 20, further comprise an incident beam treatment region, it is arranged in the described recording medium, be positioned on the opposite side of the plane of incidence that described signal beams incides described recording medium, this incident beam treatment region is separated from each other this zero order beam and this diffracted beam, a part of incident beam is turned back to described recording medium inside.
22., further be included in the linear track that forms in the part of described incident beam treatment region according to the method that is used for reconstructing hologram of claim 21.
23. according to the method that is used for reconstructing hologram of claim 22, wherein said track has the locating information of described incident beam treatment region with respect to described recording medium.
24. the method that is used for reconstructing hologram according to claim 21, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region allows this zero order beam to pass, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and reflects this diffracted beam.
25. the method that is used for reconstructing hologram according to claim 21, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and allows this diffracted beam to pass.
26. the method that is used for reconstructing hologram according to claim 21, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or allowing this zero order beam to pass, this diffracted beam echo area limits this zero order beam treatment region and absorbs this diffracted beam.
27. the method that is used for reconstructing hologram according to each claim in the claim 24 to 26, wherein comprise that by utilization the spatial light modulator of the row and column matrix of pixel writes down the diffraction grating zone of this recording medium in the following manner, promptly, make described spatial light modulator and described recording medium relatively be provided with, thereby the diffracted beam of described signal beams can not shine described zero order beam treatment region.
28. the method that is used for reconstructing hologram according to claim 27, described spatial light modulator and described recording medium relatively are provided with respect to the optical axis of described signal beams, that is, make θ (θ ≠ 0) angle that bearing of trend and a bearing of trend of described zero order beam treatment region of the delegation of described spatial light modulator or row become to be scheduled to.
29. according to the method that is used for reconstructing hologram of claim 25, wherein in the reproduction process, the opposite side that incides the plane of incidence of described recording medium from described signal beams is exported described reproduction ripple.
30. holographic recording and transcriber are used for information is recorded as the diffraction grating zone of recording medium, and are used for reproducing described recorded information from described diffraction grating zone, described holographic recording and transcriber comprise:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
The signal beams generation unit comprises spatial light modulator, and described spatial light modulator is modulated described reference beam according to described information space to be recorded, to produce signal beams;
Interference unit, comprise illuminating optical system, be used to utilize this signal beams to shine described recording medium, to allow this signal beams to enter and pass described recording medium, described illuminating optical system, the part that interferes each other in described recording medium inside at the zero order beam that is arranged in this signal beams and diffracted beam, form the diffraction grating zone according to light interference pattern, described illuminating optical system utilizes described reference beam to shine described diffraction grating zone, to produce the reproduction ripple corresponding to this signal beams; And
Detecting unit is used for detecting the described recorded information that is formed in an image by this reproduction waveform.
31. holographic recording and transcriber according to claim 30, further comprise an incident beam treatment region, be arranged in the described recording medium, be positioned on the opposite side of the plane of incidence that described signal beams incides described recording medium, this incident beam treatment region is separated from each other this zero order beam and this diffracted beam, a part of incident beam is turned back to described recording medium inside.
32., further be included in the linear track that forms in the part of described incident beam treatment region according to the holographic recording and the transcriber of claim 31.
33. according to the holographic recording and the transcriber of claim 32, wherein said track has the locating information of described incident beam treatment region with respect to described recording medium.
34. holographic recording and transcriber according to claim 31, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region allows this zero order beam to pass, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and reflects this diffracted beam.
35. holographic recording and transcriber according to claim 31, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and allows this diffracted beam to pass.
36. holographic recording and transcriber according to claim 31, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or allowing this zero order beam to pass, this diffracted beam echo area limits this zero order beam treatment region and absorbs this diffracted beam.
37. holographic recording and transcriber according to each claim in the claim 34 to 36, further comprise spatial light modulator, this spatial light modulator comprises the row and column matrix of pixel, with the described reference beam of spatial modulation, wherein, described spatial light modulator and described recording medium are set relatively according to making the diffracted beam of described signal beams can not shine the mode of described zero order beam treatment region.
38. holographic recording and transcriber according to claim 37, described spatial light modulator and described recording medium relatively are provided with respect to the optical axis of described signal beams, that is, make θ (θ ≠ 0) angle that bearing of trend and a bearing of trend of described zero order beam treatment region of the delegation of described spatial light modulator or row become to be scheduled to.
39. according to the holographic recording and the transcriber of claim 35, the opposite side that incides the plane of incidence of described recording medium from described signal beams is exported described reproduction ripple.
40. holographic recording and transcriber according to claim 34 or 36 further comprise separative element, and the described reproduction ripple and the light path of described reference beam are separated.
41. a hologram recording apparatus is used for information is recorded as the diffraction grating zone of recording medium, comprising:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
The signal beams generation unit comprises spatial light modulator, and described spatial light modulator is according to described information to be recorded, and the described reference beam of spatial modulation is to produce signal beams; And
Interference unit, comprise illuminating optical system, be used to utilize this signal beams to shine described recording medium, to allow this signal beams to enter and pass described recording medium, described illuminating optical system, part in that the zero order beam that is arranged in signal beams and diffracted beam interfere each other in described recording medium inside forms the diffraction grating zone according to light interference pattern.
42. hologram recording apparatus according to claim 41, wherein said recording medium comprises an incident beam treatment region, it is arranged in the described recording medium, be positioned on the opposite side of the plane of incidence that described signal beams incides described recording medium, this incident beam treatment region is separated from each other this zero order beam and this diffracted beam, a part of incident beam is turned back to described recording medium inside.
43., further be included in the linear track that forms in the part of described incident beam treatment region according to the hologram recording apparatus of claim 42.
44. according to the hologram recording apparatus of claim 43, wherein said track has the locating information of described incident beam treatment region with respect to described recording medium.
45. hologram recording apparatus according to claim 42, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region allows this zero order beam to pass, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and reflects this diffracted beam.
46. hologram recording apparatus according to claim 42, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and allows this diffracted beam to pass.
47. hologram recording apparatus according to claim 42, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or allowing this zero order beam to pass, this diffracted beam echo area limits this zero order beam treatment region and absorbs this diffracted beam.
48. hologram recording apparatus according to each claim in the claim 45 to 47, further comprise spatial light modulator, this spatial light modulator comprises the row and column matrix of pixel, with the spatial modulation reference beam, wherein, described spatial light modulator and described recording medium are set relatively according to making the diffracted beam of described signal beams can not shine the mode of described zero order beam treatment region.
49. hologram recording apparatus according to claim 48, described spatial light modulator and described recording medium relatively are provided with respect to the optical axis of described signal beams, that is, make θ (θ ≠ 0) angle that bearing of trend and a bearing of trend of described zero order beam treatment region of the delegation of described spatial light modulator or row become to be scheduled to.
50. a hologram reproduction apparatus is used for reproducing the information that writes down as recording medium diffraction grating zone, this hologram reproduction apparatus comprises:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
Illumination unit comprises illuminating optical system, is used to utilize this reference beam to shine this recording medium, enters and pass diffraction grating zone in this recording medium to allow this reference beam, to produce the reproduction ripple corresponding to this signal beams; And
Detecting unit is used for detecting the described recorded information that is formed in an image by this reproduction waveform.
51. hologram reproduction apparatus according to claim 50, wherein this recording medium comprises an incident beam treatment region, it is arranged in the described recording medium, be positioned on the opposite side of the plane of incidence that described signal beams incides described recording medium, this incident beam treatment region is separated from each other this zero order beam and this diffracted beam, a part of incident beam is turned back to described recording medium inside.
52., further be included in the linear track that forms in the part of described incident beam treatment region according to the hologram reproduction apparatus of claim 51.
53. according to the hologram reproduction apparatus of claim 52, wherein said track has the locating information of described incident beam treatment region with respect to described recording medium.
54. hologram reproduction apparatus according to claim 51, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region allows this zero order beam to pass, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and reflects this diffracted beam.
55. hologram reproduction apparatus according to claim 51, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and allows this diffracted beam to pass.
56. hologram reproduction apparatus according to claim 51, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or allowing this zero order beam to pass, this diffracted beam echo area limits this zero order beam treatment region and absorbs this diffracted beam.
57. hologram reproduction apparatus according to each claim in the claim 54 to 56, the spatial light modulator that wherein comprises the row and column matrix of pixel in the following manner by utilization, write down the diffraction grating zone of this recording medium, promptly, be oppositely arranged described spatial light modulator and described recording medium, thereby make the diffracted beam of described signal beams can not shine described zero order beam treatment region.
58. hologram reproduction apparatus according to claim 57, described spatial light modulator and described recording medium relatively are provided with respect to the optical axis of described signal beams, that is, make θ (θ ≠ 0) angle that bearing of trend and a bearing of trend of described zero order beam treatment region of the delegation of described spatial light modulator or row become to be scheduled to.
59. according to the hologram reproduction apparatus of claim 55, wherein the opposite side that incides the plane of incidence of described recording medium from described signal beams is exported described reproduction ripple.
60. according to the hologram reproduction apparatus of claim 54 or 56, further comprise separative element, be used for the described reproduction ripple and the light path of described reference beam are separated.
61. recording medium, make by can realize the photochromics that writes down by the coherent light beam irradiation, comprise an incident beam treatment region, it is arranged on and is positioned in the described recording medium on the opposite side of the plane of incidence that light beam incides this recording medium, this incident beam treatment region is separated from each other the zero order beam and the diffracted beam of light beam, thereby a part of incident beam is turned back to described recording medium inside.
62., further be included in the linear track that forms in the part of described incident beam treatment region according to the recording medium of claim 61.
63. according to the recording medium of claim 62, wherein said track has the locating information of described incident beam treatment region with respect to described recording medium.
64. recording medium according to claim 61, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region allows this zero order beam to pass, or this zero order beam of scattering, or this zero order beam of deflection, or the absorption zero order beam, this diffracted beam echo area limits this zero order beam treatment region and reflects this diffracted beam.
65. recording medium according to claim 61, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and allows this diffracted beam to pass.
66. recording medium according to claim 61, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or allowing this zero order beam to pass, this diffracted beam echo area limits this zero order beam treatment region and absorbs this diffracted beam.
67. holographic recording and transcriber are used for information is recorded as the diffraction grating zone of recording medium, and are used for reproducing described recorded information from described diffraction grating zone, described holographic recording and transcriber comprise:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
The signal beams generation unit comprises spatial light modulator, and described spatial light modulator is modulated described reference beam according to described information space to be recorded, to produce signal beams;
Interference unit, comprise illuminating optical system, be used to utilize signal beams to shine described recording medium, to allow this signal beams to enter and pass described recording medium, described illuminating optical system, the part that interferes each other in described recording medium inside at the zero order beam that is arranged in described signal beams and diffracted beam, form the diffraction grating zone according to light interference pattern, described illuminating optical system utilizes described reference beam to shine described diffraction grating zone, to produce the reproduction ripple corresponding to described signal beams;
The incident beam treatment region, contiguous described signal beams incides this incident beam treatment region of couple positioned opposite of the plane of incidence of described recording medium, this incident beam treatment region is separated from each other this zero order beam and this diffracted beam, so that a part of incident beam turns back to described recording medium inside; And
Detecting unit is used for detecting the described recorded information that is formed in an image by this reproduction waveform.
68. holographic recording and transcriber according to claim 67, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region allows this zero order beam to pass, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and reflects this diffracted beam.
69. holographic recording and transcriber according to claim 67, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and allows this diffracted beam to pass.
70. holographic recording and transcriber according to claim 67, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or allowing this zero order beam to pass, this diffracted beam echo area limits this zero order beam treatment region and absorbs this diffracted beam.
71. holographic recording and transcriber according to claim 67, wherein said spatial light modulator comprises the row and column matrix of pixel, and described spatial light modulator and described recording medium relatively are provided with respect to the optical axis of described signal beams, that is, make θ (θ ≠ 0) angle that bearing of trend and a bearing of trend of described zero order beam treatment region of the delegation of described spatial light modulator or row become to be scheduled to.
72. according to the holographic recording and the transcriber of claim 69, wherein the opposite side that incides the plane of incidence of described recording medium from described signal beams is exported described reproduction ripple.
73. holographic recording and transcriber according to claim 68 or 70 further comprise separative element, and the described reproduction ripple and the light path of described reference beam are separated.
74. a hologram recording apparatus is used for information is recorded as the information in the diffraction grating zone of recording medium, comprising:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
The signal beams generation unit comprises spatial light modulator, and described spatial light modulator is modulated described reference beam according to described information space to be recorded, to produce signal beams;
Interference unit, comprise illuminating optical system, be used to utilize this signal beams to shine this recording medium, to allow this signal beams to enter and pass described recording medium, described illuminating optical system, part in that the zero order beam that is arranged in this signal beams and diffracted beam interfere each other in described recording medium inside forms the diffraction grating zone according to light interference pattern; And
The incident beam treatment region, contiguous this signal beams incides this incident beam treatment region of couple positioned opposite of the plane of incidence of this recording medium, this incident beam treatment region is separated from each other zero order beam and diffracted beam, so that a part of incident beam turns back to described recording medium inside.
75. hologram recording apparatus according to claim 74, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region allows this zero order beam to pass, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and reflects this diffracted beam.
76. hologram recording apparatus according to claim 74, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and allows this diffracted beam to pass.
77. hologram recording apparatus according to claim 74, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or allowing this zero order beam to pass, this diffracted beam echo area limits this zero order beam treatment region and absorbs this diffracted beam.
78. hologram recording apparatus according to claim 74, wherein said spatial light modulator comprises the row and column matrix of pixel, and described spatial light modulator and described recording medium relatively are provided with respect to the optical axis of described signal beams, that is, make θ (θ ≠ 0) angle that bearing of trend and a bearing of trend of described zero order beam treatment region of the delegation of described spatial light modulator or row become to be scheduled to.
79. a hologram reproduction apparatus is used for reproducing the information as the diffraction grating regional record of recording medium, this hologram reproduction apparatus comprises:
Retaining part is used for removably keeping the recording medium of being made by photochromics;
Light source is used to produce the coherent reference light beam;
Illumination unit comprises illuminating optical system, is used to utilize this reference beam to shine this recording medium, enters and pass diffraction grating zone in this recording medium to allow this reference beam, to produce the reproduction ripple corresponding to this signal beams;
The incident beam treatment region, contiguous this signal beams incides this incident beam treatment region of couple positioned opposite of the plane of incidence of this recording medium, this incident beam treatment region is separated from each other zero order beam and diffracted beam, so that a part of incident beam turns back to described recording medium inside; And
Detecting unit is used for detecting the described recorded information that is formed in an image by this reproduction waveform.
80. hologram reproduction apparatus according to claim 79, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region allows this zero order beam to pass, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and reflects this diffracted beam.
81. hologram reproduction apparatus according to claim 79, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or absorbing this zero order beam, this diffracted beam echo area limits this zero order beam treatment region and allows this diffracted beam to pass.
82. hologram reproduction apparatus according to claim 79, wherein said incident beam treatment region comprises zero order beam treatment region and diffracted beam echo area, this zero order beam treatment region reflects this zero order beam, or this zero order beam of scattering, or this zero order beam of deflection, or allowing this zero order beam to pass, this diffracted beam echo area limits this zero order beam treatment region and absorbs this diffracted beam.
83. the hologram reproduction apparatus of each claim in 0 to 82 according to Claim 8, the spatial light modulator that wherein comprises the row and column matrix of pixel in the following manner by utilization, write down the diffraction grating zone of this recording medium, promptly, be oppositely arranged described spatial light modulator and described recording medium, thereby make the diffracted beam of described signal beams can not shine described zero order beam treatment region.
84. 3 hologram reproduction apparatus according to Claim 8, described spatial light modulator and described recording medium relatively are provided with respect to the optical axis of described signal beams, that is, make θ (θ ≠ 0) angle that bearing of trend and a bearing of trend of described zero order beam treatment region of the delegation of described spatial light modulator or row become to be scheduled to.
85. 1 hologram reproduction apparatus according to Claim 8, wherein in the reproduction process, the opposite side that incides the plane of incidence of described recording medium from described signal beams is exported described reproduction ripple.
86. 0 or 82 hologram reproduction apparatus further comprises separative element according to Claim 8, and the described reproduction ripple and the light path of described reference beam are separated.
CN 03823631 2002-08-01 2003-07-30 Hologram recording/reproducing method and device thereof Pending CN1688943A (en)

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN102394071A (en) * 2006-11-01 2012-03-28 英法塞技术公司 Monocular holographic data storage system architecture
CN101042893B (en) * 2006-03-20 2013-03-13 汤姆森特许公司 Holographic storage medium
CN104166141A (en) * 2014-08-11 2014-11-26 中国电子科技集团公司第三十八研究所 Method for designing multiple-input-multiple-output synthetic aperture radar system on basis of sub-band synthesis
CN110471249A (en) * 2019-09-17 2019-11-19 荆门市探梦科技有限公司 Live holographic display system
CN110865353A (en) * 2018-08-10 2020-03-06 极光飞行科学公司 System and method for reducing DVE impact on LIDAR returns
CN112334842A (en) * 2018-08-02 2021-02-05 恩维世科斯有限公司 Lighting system and method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101042893B (en) * 2006-03-20 2013-03-13 汤姆森特许公司 Holographic storage medium
CN102394071A (en) * 2006-11-01 2012-03-28 英法塞技术公司 Monocular holographic data storage system architecture
US9715426B2 (en) 2006-11-01 2017-07-25 Akonia Holographics, Llc Monocular holographic data storage system and method thereof
CN104166141A (en) * 2014-08-11 2014-11-26 中国电子科技集团公司第三十八研究所 Method for designing multiple-input-multiple-output synthetic aperture radar system on basis of sub-band synthesis
CN112334842A (en) * 2018-08-02 2021-02-05 恩维世科斯有限公司 Lighting system and method
CN112334842B (en) * 2018-08-02 2022-07-12 恩维世科斯有限公司 Lighting system and method
CN110865353A (en) * 2018-08-10 2020-03-06 极光飞行科学公司 System and method for reducing DVE impact on LIDAR returns
CN110865353B (en) * 2018-08-10 2024-02-09 极光飞行科学公司 System and method for reducing DVE impact on LIDAR return
CN110471249A (en) * 2019-09-17 2019-11-19 荆门市探梦科技有限公司 Live holographic display system
CN110471249B (en) * 2019-09-17 2024-03-05 荆门市探梦科技有限公司 In-situ holographic display system

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