CN104658557A - Holographic optical disc storage device for optical fiber-guided polarization multiplexing - Google Patents
Holographic optical disc storage device for optical fiber-guided polarization multiplexing Download PDFInfo
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- CN104658557A CN104658557A CN201310587506.2A CN201310587506A CN104658557A CN 104658557 A CN104658557 A CN 104658557A CN 201310587506 A CN201310587506 A CN 201310587506A CN 104658557 A CN104658557 A CN 104658557A
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- focal plane
- storage device
- fourier
- holographic
- optical fiber
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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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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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
- G11B7/1376—Collimator 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
- G11B7/1384—Fibre optics
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
- Holo Graphy (AREA)
Abstract
The invention discloses a holographic optical disc storage device for optical fiber-guided polarization multiplexing. Along the light path advancing direction, the holographic optical disc storage device comprises a laser, an electro-optical modulation crystal and a 1*2 optical fiber beam splitter, wherein the 1*2 optical fiber beam splitter generates a reference light beam ad an object light beam according to a certain splitting ratio; an object light path comprises an optical fiber, a lens, a spatial light modulator, a first Fourier lens, an optical disc, a second Fourier lens ad a CCD camera; the two Fourier lenses form a 4f system; the spatial light modulator is positioned on the front focal plane of the first Fourier lens; the rear focal plane of the first Fourier lens is positioned in a storage medium of the optical disc; the front focal plane of the second Fourier lens is superposed with the rear focal plane of the first Fourier lens; the rear focal plane of the second Fourier lens is positioned on the reception surface of the CCD camera; an output optical fiber which has a self-focusing lens at the tail end guides the reference light to the storage medium of the optical disc and the rear focus of the first Fourier lens. The holographic optical disc storage device has the advantages of being high storage density, small volume, stable performance and high performance cost ratio.
Description
Technical field
The present invention relates to a kind of holographic optical disk storage system, particularly a kind of holographic CD storage device of fiber guides palarization multiplexing.
Background technology
CD storage technique and CD drive have been that market accepts, and its storage density is high, volume is little, easy to carry, in profile and music and video display playback etc., play great role.But the requirement of capacity of optical storage is constantly improved, the preservation of additional information and transmission, and more high definition image storage and issue and need larger space, the peak capacity of current DVD CD (120cm diameter) is about 10GByte, gap is also had with current magnetic hard disk and semiconductor memory capacity, its transmission speed is also unhappy simultaneously, there is defect.The particularly develop rapidly of information network, requires that the memory capacity of computing machine and transmission speed improve further, and mass memory, high-speed transfer are an important topic of information age 21 century forever, and this provides favourable space to the development of holographic optical disk.Holographic memory not only has high remaining memory property, has more the feature of concurrent reading and concurrent writing, is the focus of various countries' research and development in the world at present.The research institution in the U.S., Japan and West Europe cooperates with company, throws huge fund research and development holographic optical disk and CD drive, and does one's utmost it to introduce to the market.Commercialization progress faster, it is very fierce to compete, but they do not adopt optical fiber to guide light path, do not improve storage density further by the mode of palarization multiplexing yet.Owing to not using fiber guides, reference path and object light road just not easily form aplanatism, and the quality stored is interfered in impact.Simultaneously in order to improve storage density, memory point is little, and just require that the numerical aperture of lens in light path is large, focal length shortens, and such reference beam more not easily imports.The use of optical elements numerous in addition, improves requirement and the cost of adjustment, also not easily adopts various multiplex technique to improve storage density.
Summary of the invention
The problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, provides a kind of holographic CD storage device of fiber guides palarization multiplexing, to improve storage density further, simplifies light channel structure, improves the ratio of performance to price of device.
Technical solution of the present invention is as follows:
A kind of holographic CD storage device of fiber guides palarization multiplexing, its formation comprises along light path working direction: laser instrument, electrooptical modulation crystal, 1 × 2 fiber optic splitter, this 1 × 2 fiber optic splitter will produce the reference beam and object beam of pressing certain splitting ratio, object light road comprises optical fiber, lens, spatial light modulator, first fourier lense, CD, second fourier lense and ccd video camera, these two fourier lenses constitute a 4f system, spatial light modulator is positioned on the front focal plane of the first fourier lense, the back focal plane of the first fourier lense is positioned at the storage medium of CD, the front focal plane of the second fourier lense overlaps with the back focal plane of the first fourier lense, the back focal plane of the second fourier lense overlaps with ccd video camera receiving plane, end to guide in the storage medium of CD and the back focus of the first fourier lense with the output optical fibre of GRIN Lens with reference to light.
Described electrooptical modulation crystal can replace with 1/2 wave plate rotated.
Described optical fiber is provided with optical fiber polarization controller.
1 × 2 described fiber optic splitter is n × 2 fiber optic splitter, and described laser instrument is multi-wavelength semiconductor laser array (11).
Technique effect of the present invention is as follows:
1, holographic optical disk memory technology has compared with now widely used CD, DVD CD the advantage that memory capacity is large, transmission speed is fast, the polarization multiplexing controlling polarization state with electro-optic crystal can use with other multiplex technique simultaneously, as angular multiplexed, displacement is multiplexing and wavelength multiplexing etc., improves storage density.
2, the holographic interference light path that polarization-preserving optical fibre device guides simplifies CD drive light path, adds reliability.When introducing to the market particularly as commodity, there is the higher ratio of performance to price.
Accompanying drawing explanation
Fig. 1 is the holographic CD storage device that the embodiment of the present invention 1 electro-optic crystal controller carrys out the fiber guides palarization multiplexing of modulation lines polarized light direction of vibration;
Fig. 2 is the holographic CD storage device that the embodiment of the present invention 2 rotation of 1/2 wave plate carrys out the fiber guides palarization multiplexing of modulation lines polarized light direction of vibration;
Fig. 3 is the holographic CD storage device that the embodiment of the present invention 3 optical fiber polarization controller carrys out the fiber guides palarization multiplexing of modulation lines polarized light direction of vibration;
Fig. 4 is the reflection holography optical disk storage apparatus of the embodiment of the present invention 4 by fiber guides palarization multiplexing;
Fig. 5 is the holographic CD storage device of the embodiment of the present invention 5 by fiber guides multi-wavelength palarization multiplexing.
Embodiment
As shown in Figures 1 and 2, it is the holographic CD storage device that the embodiment of the present invention 1 electro-optic crystal controller carrys out the fiber guides palarization multiplexing of modulation lines polarized light direction of vibration, as seen from the figure, its formation comprises along light path working direction: laser instrument 1, electrooptical modulation crystal 2, 1 × 2 fiber optic splitter 3, this 1 × 2 fiber optic splitter 3 will produce the reference beam and object beam of pressing certain splitting ratio, object light road comprises optical fiber, lens 4, spatial light modulator 5, first fourier lense 6, CD 9, second fourier lense 7 and ccd video camera 8, these two fourier lenses constitute a 4f system, spatial light modulator 5 is positioned on the front focal plane of the first fourier lense 6, the back focal plane of the first fourier lense 6 is positioned at the storage medium of CD 9, the front focal plane of the second fourier lense 7 overlaps with the back focal plane of the first fourier lense 6, the back focal plane of the second fourier lense 7 overlaps with ccd video camera 8 receiving plane, an end of reference path to guide in the storage medium of CD 9 and the back focus of the first fourier lense 6 with the output optical fibre of GRIN Lens 10 with reference to light.
Described laser instrument 1 can be the laser instrument of semiconductor laser or other type, requires their linearly polarized lights to export and has certain coherent length, and this is the interference of light beam and object beam for ease of reference and configures the application of multiplex technique.Polarized light exports the direction of vibration that can be changed polarized light output by an electrooptical modulation crystal 2, thus realizes the object of palarization multiplexing.1 × 2 fiber optic splitter 3 will produce the reference beam and object beam of pressing certain splitting ratio, fiber optic splitter 3 serves the effect that general holographic optical stores the optical elements such as spatial filter, beam splitter and catoptron in light path, simplify light path, improve optical quality.As an output optical fibre with reference to light path with GRIN Lens 10, in Fourier holography optical storage light path, instead of the effect of convergent lens or collimation lens in general holographic memory light path easily.The length adjustment of output optical fibre improves making the interference performance of two light beams.Lens 4 are beam-expanding collimation mirrors, and object beam is expanded into the directional light of the article size be stored by it; Spatial light modulator 5 represents the object light information that will be stored, and it is positioned on the front focal plane of fourier lense 6, and its back focal plane is positioned at the storage medium of CD 9.The optical disk medium that we use at present is the photopolymer material of about 100 micron thickness, and it does not need rear wet-chemical treatment, highly sensitive, has good repellence to environment.Fourier lense 7 and fourier lense 6 constitute a 4f system (f is the focal length of fourier lense), and its front focal plane is positioned at the storage medium of CD 9, and back focal plane is positioned on ccd video camera 8 receiving plane.After information record completes, the information be stored on CD only needs to produce the irradiation (object light road is closed, and can have been come by spatial light modulator 5) of examining light beam, and present picture (i.e. information) is exported by the parallel reception of ccd video camera 8.All processes has computing machine to control and process.
As the extension of this method, palarization multiplexing requires that the change of polarized light direction of vibration also can be replaced electrooptical crystal modulator with rotating 1/2 wave plate 21 and be obtained.As shown in Figure 2.Additionally by the polarization direction that also can change polarized light to the adjustment of optical fiber itself, such as rotate the polarization direction that fiber-optic output changes light beam, also adjustable optical fiber polarization controller 31 and 32 obtains the linearly polarized light of arbitrary polarized direction, as shown in Figure 3.Fig. 4 is the reflection holography optical disk storage apparatus of the embodiment of the present invention 4 by fiber guides palarization multiplexing, is not repeated herein.
As expansion of the present invention, if our 1 × 2 fiber optic splitter 3 changes n × 2 fiber optic splitter 30 into, adopt multi-wavelength semiconductor laser array 11 simultaneously, just can set up the holographic optical disk storage system of multi-wavelength multiplex, it can avoid in holophotal system in the past, for making each wavelength form unified light path and the making difficulty of the saturating reflection filter of various wavelength that needs and the inconvenience of adjustment light path, as shown in Figure 5.
Claims (4)
1. the holographic CD storage device of a fiber guides palarization multiplexing, it is characterized in that: its formation comprises along light path working direction: laser instrument (1), electrooptical modulation crystal (2), 1 × 2 fiber optic splitter (3), this 1 × 2 fiber optic splitter (3) will produce the reference beam and object beam of pressing certain splitting ratio, object light road comprises optical fiber, lens (4), spatial light modulator (5), first fourier lense (6) CD (9), second fourier lense (7) and ccd video camera (8), these two fourier lenses constitute a 4f system, spatial light modulator (5) is positioned on the front focal plane of the first fourier lense (6), the back focal plane of the first fourier lense (6) is positioned at the storage medium of CD (9), the front focal plane of the second fourier lense (7) overlaps with the back focal plane of the first fourier lense (6), the back focal plane of the second fourier lense (7) overlaps with ccd video camera (8) receiving plane, end to guide in the storage medium of CD (9) and the back focus of the first fourier lense (6) with the output optical fibre of GRIN Lens (10) with reference to light.
2. the holographic CD storage device of fiber guides palarization multiplexing according to claim 1, is characterized in that: 1/2 wave plate (21) of described electrooptical modulation crystal (2) available rotation replaces.
3. the holographic CD storage device of fiber guides palarization multiplexing according to claim 1, is characterized in that: described optical fiber is provided with optical fiber polarization controller (31) and (32).
4. the holographic CD storage device of fiber guides palarization multiplexing according to claim 1, is characterized in that: 1 × 2 described fiber optic splitter for the laser instrument described in n × 2 fiber optic splitter (30) be multi-wavelength semiconductor laser array (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310587506.2A CN104658557A (en) | 2013-11-19 | 2013-11-19 | Holographic optical disc storage device for optical fiber-guided polarization multiplexing |
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| CN201310587506.2A CN104658557A (en) | 2013-11-19 | 2013-11-19 | Holographic optical disc storage device for optical fiber-guided polarization multiplexing |
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| CN104658557A true CN104658557A (en) | 2015-05-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945083A (en) * | 2021-01-29 | 2021-06-11 | 中国科学院长春光学精密机械与物理研究所 | Parallel phase shift digital holographic microscopic imaging system with optical fiber interconnection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945083A (en) * | 2021-01-29 | 2021-06-11 | 中国科学院长春光学精密机械与物理研究所 | Parallel phase shift digital holographic microscopic imaging system with optical fiber interconnection |
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Application publication date: 20150527 |