CN110265066B - Holographic storage device and operation method thereof - Google Patents
Holographic storage device and operation method thereof Download PDFInfo
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- CN110265066B CN110265066B CN201810201207.3A CN201810201207A CN110265066B CN 110265066 B CN110265066 B CN 110265066B CN 201810201207 A CN201810201207 A CN 201810201207A CN 110265066 B CN110265066 B CN 110265066B
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B7/1374—Objective lenses
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
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- Optical Recording Or Reproduction (AREA)
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Abstract
A holographic storage device and an operation method thereof. The holographic storage device comprises a light source module, a light guide module and an optical conversion unit. The light source module is used for providing at least one light beam. The light guide module is used for receiving the light beam from the light source module and guiding the light beam from the light source module to the storage disc. The optical conversion unit is optically coupled between the light source module and the storage disk, and is used for converting the light beams from the light source module into light beams projected in a point light source array mode. Through the optical conversion unit, the generated diffracted light has sufficient intensity when the storage disc has displacement, thereby increasing the tolerance of the holographic storage device to the displacement of the storage disc.
Description
Technical Field
The invention relates to a holographic storage device and an operation method thereof.
Background
With the development of technology, the required storage capacity of electronic files has increased. A common storage method is to record magnetic or optical changes on the surface of a storage medium, such as a magnetic disc or an optical disc, as the basis of the stored data. However, as the required storage capacity of electronic files increases, the development of holographic storage technology has become more and more attractive.
The holographic storage technique is to write image data into a storage medium (photosensitive material) after interference is generated between signal light and reference light. When reading data, image data can be generated by re-irradiating the reference light onto the storage medium (photosensitive material). Then, the generated image data is read by the detector. However, during reading, the disc accommodating the storage medium (photosensitive material) may be shifted, so that the reading result will be distorted.
Disclosure of Invention
An embodiment of the invention provides a holographic storage device, which includes a light source module, a light guide module and an optical conversion unit, wherein the light source module can provide reference light, and the light guide module can guide the reference light provided by the light source module to a storage disc. The optical conversion unit is optically coupled between the light source module and the storage disk, and is used for converting the reference light into a point light source array to be projected. Through the optical conversion unit, the generated diffracted light has sufficient intensity when the storage disc has displacement, thereby increasing the tolerance of the holographic storage device to the displacement of the storage disc.
An embodiment of the present invention provides a holographic storage device, which includes a light source module, a light guide module, and an optical conversion unit. The light source module is used for providing at least one light beam. The light guide module is used for receiving the light beam from the light source module and guiding the light beam from the light source module to the storage disc. The optical conversion unit is optically coupled between the light source module and the storage disk, and is used for converting the light beams from the light source module into light beams projected in a point light source array mode.
In some embodiments, the optical conversion unit includes a grating, and the holographic storage device further includes a micro lens array and an objective lens. The microlens array is optically coupled between the grating and the objective lens, and the objective lens is optically coupled between the microlens array and the storage disc.
In some embodiments, the vertical distance between the grating and the objective lens is approximately equal to the focal length of the objective lens, and the vertical distance between the objective lens and the storage disc is approximately equal to the focal length of the objective lens.
In some embodiments, the light source module is configured to provide reference light and signal light, the reference light surrounds the signal light, and the arrangement positions of the micro lens array and the grating correspond to the light path of the reference light.
In some embodiments, the grating has a first opening and the microlens array has a second opening. The first opening and the second opening are used together to enable the signal light to pass through the grating and the micro-lens array.
In some embodiments, the holographic storage device further includes a first focusing lens, wherein the optical conversion unit is optically coupled between the first focusing lens and the light guide module, and the first focusing lens is configured to focus the light beam on the optical conversion unit.
In some embodiments, the optical conversion unit includes a grating.
In some embodiments, the light beam provided by the light source module is a reference light, and the holographic storage module further includes an objective lens, an illuminator, a second focusing lens, and a light detector. The objective lens is optically coupled between the light guide module and the storage disc. The illuminator is used to supply signal light toward the objective lens. The second focusing lens is optically coupled between the storage disc and the photodetector.
An embodiment of the present invention provides an operation method of a holographic storage device, including the following steps. Providing the reference light to the storage disc. The optical conversion unit is disposed on the optical path of the reference light to convert the reference light to project toward the storage disc in a point light source array manner. The optical conversion unit is removed from the optical path of the reference light, which is substantially the same as the optical path of the reading light, and provides the reading light to the storage disc.
In some embodiments, the step of disposing the optical conversion unit on the optical path of the reference light includes disposing a grating on the optical path of the reference light.
Drawings
FIG. 1A is a schematic diagram illustrating a configuration of a holographic storage device according to a first embodiment of the present disclosure;
FIG. 1B is a schematic diagram of the arrangement of the optical transforming unit, the micro-lens array, the first objective lens and the storage disc of FIG. 1A;
FIG. 1C is a schematic front view of the optical conversion unit of FIG. 1B;
FIG. 2A is a schematic view showing the relationship between the intensity and the position of a storage material during reading after a reference light is projected by a single-point light source;
FIG. 2B is a schematic diagram showing the relationship between the intensity and the position of the storage material during reading after the reference light is projected by the multi-point light source;
FIG. 3 is a schematic diagram illustrating a configuration of a holographic storage device according to a second embodiment of the present disclosure.
Detailed Description
While the spirit of the invention will be described in detail and with reference to the drawings, those skilled in the art will understand that various changes and modifications can be made without departing from the spirit and scope of the invention as taught herein.
It will be understood that the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections. These elements, components, regions, layers and/or regions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Referring to fig. 1A, fig. 1A is a schematic configuration diagram of a holographic storage device 100A according to a first embodiment of the disclosure. The holographic storage device 100A may perform a writing process and a reading process on the storage disc 102, wherein the writing process is to focus reference light and signal light on the storage disc 102 through the objective lens to interfere and store data therein, and the reading process is to diffract the reference light on the storage disc 102 and restore the data stored therein. In addition, the holographic storage device 100A shown in fig. 1A is of a coaxial structure, and includes a light source module 110, a light guide module 120, an optical conversion unit 150, a micro lens array 154, a first objective lens 160, and a photodetector 170.
The light source module 110 includes a light emitter (not shown) and a Spatial Light Modulator (SLM) 112. The light emitter may be, for example, a laser light source, which emits a light beam toward the spatial light modulator 112, and then the spatial light modulator 112 may modulate the light beam after receiving the light beam from the laser light source, so that the light source module 110 may provide a signal light, a reference light or a reading light to the light guide module 120. The holographic storage device 100A shown in fig. 1A performs a writing process on the storage disc 102, so that the light source module 110 can provide the signal light S and the reference light R to the light guide module 120, wherein the reference light R surrounds the signal light S.
The light guide module 120 includes a first guiding lens 122, a first Polarizing Beam Splitter (PBS) 124, a second guiding lens 126, a quarter wave plate 128, and a third guiding lens 130. Through the combination of the optical elements, the light guide module 120 can receive the signal light S and the reference light R provided by the light source module 110 through the first guiding lens 122, and guide the signal light S and the reference light R to the optical conversion unit 150.
The optical switch unit 150, the micro lens array 154 and the first objective lens 160 are optically coupled between the light guide module 120 and the storage disc 102, wherein the optical switch unit 150 is optically coupled between the light guide module 120 and the micro lens array 154. Although the optical conversion unit 150 and the microlens array 154 of fig. 1A are illustrated as having a spacing therebetween, in other embodiments, the optical conversion unit 150 and the microlens array 154 may be closely attached to each other. The signal light S and the reference light R from the light guide module 120 to the optical conversion unit 150 can enter the storage disc 102 after sequentially passing through the optical conversion unit 150, the micro lens array 154 and the first objective lens 160. The relationship between the optical conversion unit 150, the micro lens array 154, the first objective lens 160 and the storage disc 102 will be further described below.
Referring to fig. 1B and fig. 1C, fig. 1B is a schematic diagram illustrating an arrangement of the optical transforming unit 150, the micro-lens array 154, the first objective lens 160 and the storage disc 102 of fig. 1A, and fig. 1C is a schematic diagram illustrating a front view of the optical transforming unit 150 of fig. 1B. The optical conversion unit 150 includes a grating 152, wherein the grating 152 is optically coupled between the light guide module 120 (see fig. 1A) and the microlens array 154, the microlens array 154 is optically coupled between the grating 152 and the first objective lens 160, and the first objective lens 160 is optically coupled between the microlens array 154 and the storage disc 102, wherein a vertical distance between the grating 152 and the first objective lens 160 is approximately equal to a focal length F of the first objective lens 160, and a vertical distance between the first objective lens 160 and the storage disc 102 is also approximately equal to a focal length F of the first objective lens 160.
The grating 152 and the microlens array 154 are disposed at positions corresponding to the optical path of the reference light R. Specifically, the grating 152 may have a first opening 156A therein, and the micro lens array 154 has a second opening 156B therein, so that when the holographic storage apparatus 100A performs a writing process on the storage disc 102, the first opening 156A and the second opening 156B can be used together to make the signal light S pass through the grating 152 and the micro lens array 154 and then proceed toward the first objective lens 160.
After the reference light R passes through the grating 152, the reference light R is converted into a point light source array. Then, when the reference light R passes through the microlens array 154, the reference light R is phase-modulated by the microlens array 154 and is projected toward the first objective lens 160. Specifically, as shown in fig. 1B, the reference light R is converted into reference light R' projected in a plurality of directions by the grating 152. That is, in the writing process of the holographic storage device 100A to the storage disc 102, the position of the storage disc 102 where the reference beam R writes data is a plurality of points. In the case where the storage disc 102 is written with data at a plurality of points by the reference light R, even if the storage disc 102 is shifted during the reading process, the storage disc 102 can still generate diffraction light with sufficient intensity to complete the reading process because the Bragg condition (at a certain point of the reference light during recording) can still be satisfied.
Further, please see fig. 2A and fig. 2B simultaneously. Fig. 2A is a schematic diagram illustrating the relationship between the intensity and the position of the storage material during reading after the reference light is projected by the single-point light source. Fig. 2B is a schematic diagram illustrating the relationship between the intensity and the position of the storage material during reading after the reference light is projected by the multi-point light source. In fig. 2A and 2B, the horizontal axis is the horizontal coordinate on the storage material, and the vertical axis is the intensity of the diffracted light leaving the storage material, such as a storage disk.
In fig. 2A, since the reference light used in the writing process is written by a single-point light source, only one waveform of the diffracted light generated by diffraction in the storage material during the reading process is provided, wherein the waveform of the diffracted light has a full width at half maximum W. During the reading process, when only one waveform of the generated diffracted light exists, if the position of the storage material is shifted, the intensity of the generated diffracted light may fall outside the full width at half maximum W, i.e., the generated diffracted light may have insufficient intensity.
In fig. 2B, since the reference light used in the writing process of the storage material is written by using a multi-point light source, more than one diffraction light waveform is generated in the storage material due to diffraction during the reading process, and in order to not complicate the drawing, two diffraction light waveforms are depicted in fig. 2B, where each diffraction light waveform has a half-height width W, and adjacent peaks are separated by a distance D, and the distance D is smaller than the half-height width W. During the reading process, even if the position of the storage material is shifted when the waveform of the generated diffracted light exceeds one, the intensity of the generated diffracted light can be prevented from falling outside the full width at half maximum W because the waveforms of the different diffracted lights overlap each other, so that the generated diffracted light can still have a sufficient intensity. That is, the reference light R is transformed by the grating 152 to be projected in a point light source array manner, so that the tolerance of the holographic storage device 100A to the displacement of the storage disk can be increased.
Please return to fig. 1A. After the holographic storage device 100A completes the writing process through the grating 152, the written data is stored on the storage disc 102. When the holographic storage device 100A performs a reading process on the storage disc 102, the grating 152 is first removed from the optical path of the reference light R, and then a reading light (not shown) is provided to the storage disc 102 through the light source module 110, wherein the optical path of the reading light is substantially the same as the optical path of the reference light R. The reading light enters the storage disc 102 from the light source module 110 through the light guide module 120, and the reading light is diffracted in the storage disc 102 to become diffracted light, which is guided by the light guide module 120 to travel from the third guiding lens 130 to the light detector 170, and then received and read by the light detector 170. Since the reference light R used by the storage disc 102 during the writing process is written by a multi-point light source, the generated diffracted light has sufficient intensity even if the storage disc 102 is slightly shifted during the reading process, thereby preventing the holographic storage device 100A from distorting the data reading of the storage disc 102.
Referring to fig. 3 again, fig. 3 is a schematic configuration diagram of a holographic storage device 100B according to a second embodiment of the present disclosure. At least one difference between the present embodiment and the first embodiment is that the holographic storage device 100B of the present embodiment is configured in an off-axis system. The holographic storage device 100B includes a light source module 110, a first focusing lens 114, a light guide module 120, an illuminator 144, an optical conversion unit 150, a second objective lens 162, a second focusing lens 164, and a light detector 170.
The light source module 110 may provide the reference light R toward the first focusing lens 114, wherein the first focusing lens 114 is optically coupled between the light source module 110 and the optical conversion unit 150, and the first focusing lens 114 is configured to focus the reference light R on the optical conversion unit 150. The optical conversion unit 150 is optically coupled between the first focusing lens 114 and the storage disc 102, and the optical conversion unit 150 may be a grating for converting the reference light R from the first focusing lens 114 into a point light source array to be projected onto the light guide module 120.
The light guide module 120 includes a fourth guiding lens 132, a half-wave plate 134, a second polarization beam splitter 136, a reflector 138, a polarizer 140, and a fifth guiding lens 142. The light guide module may receive the reference light R from the optical conversion unit 150 through the fourth guide lens 132. The reference light R may pass through the half-wave plate 134, the second polarization beam splitter 136, the reflecting mirror 138, the vibrating mirror 140, the fifth guiding lens 142 from the fourth guiding lens 132, and then enter the second objective lens 162. In addition, the illuminator 144 may provide the signal light S toward the second objective lens 162.
The second objective lens 162 is optically coupled between the light guide module 120 and the storage disc 102 and also between the illuminator 144 and the storage disc 102, so that the reference light R and the signal light S can be guided to the storage disc 102 through the second objective lens 162 to generate interference, thereby performing a writing procedure of the holographic storage device 100B on the storage disc 102.
After the holographic storage device 100A completes the writing process on the storage disc 102 through the optical conversion unit 150, the written data is stored in the storage disc 102. Then, when the holographic storage device 100A performs a reading procedure on the storage disc 102, the optical conversion unit 150 is removed from the optical path of the reference light R, and then the reading light is provided to the storage disc 102 through the light source module 110, wherein the optical path of the reading light and the optical path of the reference light R may be substantially the same. The reading light enters the storage disc 102 from the light source module 110 through the light guide module 120, and is diffracted in the storage disc 102 to become diffracted light, which passes through the second focusing lens 164 after leaving the storage disc 102, wherein the second focusing lens 164 is optically coupled between the storage disc 102 and the light detector 170, so that the diffracted light passing through the second focusing lens 164 can travel toward the light detector 170. As described above, since the reference light R is converted into a point light source array by the optical conversion unit 150, even if the storage disc 102 is slightly shifted during the reading process, the generated diffracted light still has sufficient intensity, thereby preventing the holographic storage apparatus 100B from distorting the data reading of the storage disc 102.
The optical path configurations described in the first and second embodiments above are equivalent optical path configurations, not actual relative element position relationships. That is, one skilled in the art can adjust the actual relative position relationship between the elements, or increase or decrease the number of the related optical elements. For example, in the second embodiment, the position of the optical conversion unit 150 can be changed to be optically coupled between the light guide module 120 and the storage disc 102.
In summary, the holographic storage device of the present disclosure includes a light source module, a light guide module and an optical conversion unit, wherein the light source module can provide reference light, and the light guide module can guide the reference light provided by the light source module to the storage disc. The optical conversion unit is optically coupled between the light source module and the storage disk, and is used for converting the reference light into a point light source array to be projected. Through the optical conversion unit, even if the storage disc has a slight deviation during the reading process, the generated diffracted light still has enough intensity, thereby increasing the tolerance of the holographic storage device to the displacement of the storage disc.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. A holographic storage device, comprising:
the light source module is used for providing at least one light beam, providing reference light and signal light, and the reference light surrounds the signal light;
a light guide module for receiving the light beam from the light source module and guiding the light beam from the light source module to a storage disk; and an optical conversion unit optically coupled between the light source module and the storage disk for converting the light beam from the light source module into a point light source array for projection, wherein the operation method of the holographic storage device comprises:
providing a reference light to a storage disc;
arranging an optical conversion unit on the optical path of the reference light so as to convert the reference light into a point light source array to project towards the storage disc; and removing the optical conversion unit from the optical path of the reference light and providing a reading light to a storage disc, wherein the optical path of the reference light is the same as the optical path of the reading light.
2. The holographic storage device of claim 1, wherein the optical conversion unit comprises a grating, and the holographic storage device further comprises: a micro lens array; and
an objective lens, wherein the micro lens array is optically coupled between the grating and the objective lens, and the objective lens is optically coupled between the micro lens array and the storage disc.
3. The holographic storage device of claim 2, in which a vertical distance between the grating and the objective lens is equal to a focal length of the objective lens, and a vertical distance between the objective lens and the storage disc is equal to the focal length of the objective lens.
4. The holographic storage device of claim 2, wherein the micro-lens array and the grating are disposed at positions corresponding to the optical path of the reference light.
5. The holographic storage device of claim 2, wherein the grating has a first opening, and the micro-lens array has a second opening, the first opening and the second opening being used together to allow the signal light to pass through the grating and the micro-lens array.
6. The holographic storage device of claim 1, further comprising: the optical conversion unit is optically coupled between the first focusing lens and the light guide module, and the first focusing lens is used for focusing the light beam on the optical conversion unit.
7. The holographic storage device of claim 6, in which the optical conversion unit comprises a grating.
8. The holographic storage device of claim 7, wherein the light beam provided by the light source module is a reference light, and the holographic storage device further comprises: an objective lens optically coupled between the light guide module and the storage disc;
an illuminator for providing a signal light toward the objective lens;
a second focusing lens; and
a light detector, wherein the second focusing lens is optically coupled between the storage disc and the light detector.
9. The holographic storage device of claim 1, wherein the step of disposing the optical conversion unit on the optical path of the reference light comprises: a grating is arranged on the optical path of the reference light.
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