CN111816220B - Phase modulation type holographic memory reproduction method and memory reproduction device - Google Patents
Phase modulation type holographic memory reproduction method and memory reproduction device Download PDFInfo
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- CN111816220B CN111816220B CN202010678019.7A CN202010678019A CN111816220B CN 111816220 B CN111816220 B CN 111816220B CN 202010678019 A CN202010678019 A CN 202010678019A CN 111816220 B CN111816220 B CN 111816220B
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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
- G11B7/005—Reproducing
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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
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/128—Modulators
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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
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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
- G11B7/1395—Beam splitters or combiners
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24062—Reflective layers
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
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- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
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Abstract
The invention belongs to the technical field of information data storage, and discloses a phase modulation type holographic storage reproduction method and a storage reproduction device, wherein in the storage reproduction method, a reference beam is converted into an annular reference beam which surrounds the outside of an information beam and is coaxial with the information beam through a spatial modulator during information storage; the information light beam is modulated into a data page by adopting a two-dimensional phase, and the reference light beam is in a two-dimensional pattern which is regularly distributed; converging the reference beam and the information beam at a convergence point through a first convex lens; placing a recording medium at the convergence point; when information is reproduced, a light splitting component is arranged on an optical path before a reference beam reaches a first convex lens, and a receiving device is arranged on an optical axis in the reflection direction of the component, so that the data of the three-dimensional holographic record is reproduced on the receiving device; the method has the advantages of improving the storage density, reducing the dynamic range of materials, improving the signal-to-noise ratio, reducing the burden of storage materials and realizing efficient high-density data storage.
Description
Technical Field
The invention belongs to the technical field of information data storage, and particularly relates to a phase modulation type holographic storage reproduction method and a storage reproduction device.
Background
At present, the development of the big data era puts higher requirements on a storage method and storage equipment, the density of the traditional magnetic storage technology reaches the physical limit, and the service life of the medium is too short; although the traditional optical storage has long service life, the recording density depends on the size of the photoetching points on the optical disk, so that the photoetching points must be separated and can not be overlapped and staggered; holographic storage is known as a new generation of storage technology, which utilizes amplitude modulation to store information, resulting in small degree of freedom of modulation, i.e. low encoding rate, and because the phases of various points of the amplitude modulated light beam are the same, a phenomenon of light intensity concentration can be formed near the focus of the recording medium, which causes extremely uneven consumption of materials, increases the fidelity of holographic recording, causes additional noise, reduces the signal-to-noise ratio, and reduces the storage density.
Disclosure of Invention
The invention provides a phase modulation type holographic storage and reproduction method and a storage and reproduction device, aiming at the problems that in the prior art, the consumption of the materials is extremely uneven, the distortion degree of holographic recording is increased, additional noise is generated, the signal-to-noise ratio is reduced, and the storage density is reduced.
The invention is realized in that, in one aspect, the invention provides a phase-modulated holographic storage reconstruction method, comprising the steps of,
converting the reference beam (1) and the information beam (2) into an annular reference beam which is surrounded outside the information beam (2) by the reference beam (1) and is coaxial with the information beam (2) through a spatial modulator (5), wherein the reference beam (1) and the information beam (2) are coaxial;
-modulating the information beam (2) with a two-dimensional phase modulation data page (6);
converging the reference beam (1) and the information beam (2) at a convergence point through a first convex lens (3), wherein the first convex lens (3) is coaxial with the reference beam (1) and the information beam (2);
placing a recording medium (4) at the convergence point to realize three-dimensional holographic recording of data;
in information reproduction, a light splitting member is installed on an optical path before a reference beam (1) reaches a first convex lens (3), and a receiving device is installed on an optical axis in a reflection direction of the light splitting member, so that the data of three-dimensional holographic recording is reproduced on the receiving device.
In the above solution, it is preferred that the reference beam (1) is in a two-dimensional pattern of phase distribution.
It is also preferable to use a reflective optical disk as the recording medium (4).
It may also be preferred that the reflective optical disc is arranged in a structure comprising, from top to bottom, a protective layer (401), a recording layer (402) and a reflective layer (403).
It is also preferable that the spectroscopic means be a first spectroscope (7) at the time of information reproduction.
It is also preferable that the optical axis of the first convex lens (3) coincides with the transmission direction optical axis of the first beam splitter (7).
It is also preferred that a receiving device is mounted on the optical axis in the reflection direction of the first beam splitter (7) such that the data of the three-dimensional holographic recording is reproduced on the receiving device.
The invention provides a phase modulation type holographic storage reproduction device of the phase modulation type holographic storage reproduction method, which comprises a reference light source and an information light source, wherein the reference light beam (1) is converted into an annular reference light beam (1) which surrounds the outside of the information light beam (2) and is coaxial with the information light beam (2) through a spatial light modulator (5), and the reference light beam (1) and the information light beam (2) are coaxial; the information beam (2) adopts a two-dimensional phase modulation data page (6), and the reference beam (1) adopts a two-dimensional pattern of phase distribution; a first convex lens (3) which is coaxial is arranged in the optical axis direction of the reference beam (1) and the information beam (2), the reference beam (1) and the information beam (2) are converged by the first convex lens (3), and a recording medium (4) is arranged at the converging point to realize the three-dimensional holographic recording of data; a light splitting component is arranged on a light path before the reference light beam (1) reaches the first convex lens (3), and a receiving device is arranged on an optical axis of the light splitting component in the reflection direction.
In the above aspect, it is preferable that the spectroscopic means is a first spectroscope (7).
It is also preferable that the optical axis of the first convex lens (3) coincides with the transmission direction optical axis of the first beam splitter (7).
It is also preferable to mount the receiving device on the optical axis in the reflection direction of the first beam splitter (7).
The advantages of the invention are as follows:
the phase modulation type holographic storage reproduction method and the storage reproduction device can solve the problems that in the prior art, the consumption of materials is extremely uneven, the distortion degree of holographic recording is increased, additional noise is generated, the signal to noise ratio is reduced, and the storage density is reduced; the phase modulation type holographic storage and reproduction device is matched with the phase modulation type holographic storage and reproduction method, and a phase modulation structure is utilized instead of a simple amplitude brightness modulation structure, so that the storage density is improved, the dynamic range of materials is reduced, the signal to noise ratio is improved, the additional increase of storage material burden is avoided, and the high-efficiency high-density data storage is realized.
Drawings
FIG. 1 is a flow chart of a phase modulation holographic storage reconstruction method of the present invention.
Fig. 2 is a schematic diagram of a two-dimensional phase modulation data page of information light for the phase modulation type holographic memory reproduction method of the present invention.
FIG. 3 is a schematic diagram of a reference light pattern of the phase modulation holographic memory reconstruction method of the present invention.
FIG. 4 is a schematic diagram of a recording light pattern of the phase modulation holographic memory reproduction method of the present invention.
FIG. 5 is a schematic structural diagram of an embodiment of a phase modulation holographic storage reproduction apparatus according to the present invention.
FIG. 6 is a schematic diagram of a reflective optical disc of the phase modulation holographic storage reproduction apparatus according to the present invention.
Fig. 7 is a schematic structural diagram of another embodiment of a phase modulation type holographic storage reproduction apparatus according to the present invention.
Description of reference numerals:
Detailed Description
The following description of the embodiments of the present invention refers to the accompanying drawings and examples:
example 1:
a phase modulation type holographic memory reproduction method, referring to fig. 1, in information storage, comprising the steps of,
converting the reference beam 1 and the information beam 2 into an annular reference beam of which the reference beam 1 surrounds the information beam 2 and is coaxial with the information beam 2 by a spatial modulator 5, wherein the reference beam 1 and the information beam 2 are coaxial;
referring to fig. 2 and 3, the information beam 2 is applied with a two-dimensional phase modulation data page 6, and the reference beam 1 is also applied with a two-dimensional pattern of phase distribution, either or both of which belong to the pattern of phase distribution;
converging a reference beam 1 and an information beam 2 at a convergence point through a first convex lens 3, the first convex lens 3 being coaxial with both the reference beam 1 and the information beam 2;
placing a recording medium 4 at the convergence point to realize three-dimensional holographic recording of data;
at the time of information reproduction, referring to fig. 4, a spectroscopic member is installed on the optical path before the reference beam 1 reaches the first convex lens 3, and a receiving device is further installed on the optical axis in the reflection direction of the spectroscopic member, so that the data of three-dimensional holographic recording is reproduced on the receiving device.
The phase modulation type holographic memory reproduction device for the phase modulation type holographic memory reproduction method of the present embodiment, referring to fig. 5, includes a reference light source and an information light source, the reference light beam 1 is converted into an annular reference light beam 1 which surrounds the outside of the information light beam 2 and is coaxial with the information light beam 2 through a spatial light modulator 5, and the reference light beam 1 and the information light beam 2 are coaxial; the information beam 2 adopts a two-dimensional phase modulation data page 6, and the reference beam 1 can also adopt a two-dimensional pattern of phase distribution; a coaxial first convex lens 3 is arranged in the optical axis direction of the reference beam 1 and the information beam 2, the reference beam 1 and the information beam 2 are converged by the first convex lens 3, and a recording medium 4 is arranged at the convergence point to realize the three-dimensional holographic recording of data; a light splitting component is arranged on a light path before the reference light beam 1 reaches the first convex lens 3, and a receiving device is arranged on an optical axis of the light splitting component in the reflection direction.
The phase modulation type holographic memory reproduction method and the memory reproduction apparatus of the present embodiment introduce phase information, i.e., phase modulation, into the information light and the reference light by utilizing the feature that the holographic recording has simultaneous recording of amplitude and phase information. When the phase modulation information is used for holographic recording, the information amount recorded by each hologram can be improved, and meanwhile, the burden of a holographic material is not increased; the problem of light intensity concentration near a focus can be avoided by utilizing phase modulation, unbalanced consumption of materials is reduced, recording fidelity is improved, reproduction signal-to-noise ratio is improved, and storage density is improved.
Example 2:
in the phase modulation type hologram memory reproducing method and the memory reproducing apparatus according to embodiment 1, referring to fig. 6, a reflective optical disk is used as the recording medium 4. The reflective optical disc is arranged in a structure comprising, from top to bottom, a protective layer 401, a recording layer 402 and a reflective layer 403.
In addition, referring to fig. 5, in the phase modulation type holographic memory reproduction method described above, at the time of information reproduction, the first beam splitter 7 is installed on the optical path before the reference beam 1 reaches the first convex lens 3. The optical axis of the first convex lens 3 coincides with the transmission direction optical axis of the first spectroscope 7. A receiving device is mounted on the reflection direction optical axis of the first beam splitter 7, so that the data of the three-dimensional holographic recording is reproduced on the receiving device.
Accordingly, in the phase modulation type holographic memory reproduction apparatus of the present embodiment, the light splitting part is the first light splitting mirror 7. The optical axis of the first convex lens 3 coincides with the transmission direction optical axis of the first spectroscope 7. A receiving device is mounted on the reflection direction optical axis of the first beam splitter 7.
Example 3:
referring to fig. 7, in the phase modulation type holographic storage reproduction method described in embodiment 1 or embodiment 2, in information reproduction, a laser beam emitted from a laser 9 is diverged and converted into a planar light by a second convex lens 10, the planar light is converted into an annular reference beam 1 by a first reflecting mirror 11 and enters a spatial light modulator 5, the annular reference beam 1 passes through a first beam splitter 7 and then sequentially passes through a fourth convex lens 15, a second reflecting mirror 16 and a fifth convex lens 17 to reach a dichroic beam splitter 18, wherein the fourth convex lens 15 and the fifth convex lens 17 form a translational lens group, and after passing through the dichroic beam splitter 18, after passing through a λ/4 wave plate 23 and a fourth reflecting mirror 22, the information beam is converged on a holographic disk 24 by the first convex lens 3 to be reproduced, and the reproduced information beam returns along the original path, is reflected at the first beam splitter 7, and passes through a diaphragm 13, After the third convex lens 14, the reproduced image is received by the image receiver 12; the light beam emitted by the semiconductor laser 25 is reflected by the second beam splitter 21, passes through the sixth convex lens 20 and the third reflector 19, is reflected by the color splitting beam splitter 18, passes through the lambda/4 wave plate 23 and the fourth reflector 22, is converged to the holographic optical disc 24 through the first convex lens 3, and is returned to the second beam splitter 21 by the original path, and is transmitted to the photoelectric detector 8, so that the servo detection during information reproduction is realized.
The phase modulation type holographic storage reproduction apparatus of the present embodiment, referring to fig. 7, includes a laser 9, a second convex lens 10, a first reflecting mirror 11, a diaphragm 13, a third convex lens 14, an image receiver 12, a fourth convex lens 15, a second reflecting mirror 16, a fifth convex lens 17, a dichroic beam splitter 18, a third reflecting mirror 19, a sixth convex lens 20, a second beam splitter 21, a fourth reflecting mirror 22, a first convex lens 3, a holographic disk 24, a semiconductor laser 25, and a photodetector 8; the light path structure is that the laser beam emitted by the laser 9 is converted into plane light after being diverged by the second convex lens 10, the plane light enters the spatial light modulator 5 after passing through the first reflector 11 and is converted into an annular reference beam 1, the reference beam 1 and the information beam 2 are coaxial, after passing through the first spectroscope 12, passes through a fourth convex lens 15, a second reflecting mirror 16 and a fifth convex lens 17 in sequence and then reaches a color separation spectroscope 18, wherein, the fourth convex lens 15 and the fifth convex lens 17 form a translation lens group, and after the color separation spectroscope 18, after passing through a lambda/4 wave plate 23 and a fourth reflector 22, the information is converged on a holographic disk 24 by a first convex lens 3 for information reproduction, the reproduced information beam returns along the original path, reflected at the first spectroscope 7, passes through the diaphragm 13 and the third convex lens 14, and then is received by the image receiver 12 to be a reproduced image; the light beam emitted by the semiconductor laser 25 is reflected by the second beam splitter 21, passes through the sixth convex lens 20 and the third reflector 19, is reflected by the color splitting beam splitter 18, passes through the lambda/4 wave plate 23 and the fourth reflector 22, is converged to the holographic optical disc 24 through the first convex lens 3, and is returned to the second beam splitter 21 by the original path, and is transmitted to the photoelectric detector 8, so that the servo detection during information reproduction is realized.
Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (8)
1. A phase modulation holographic memory reproduction method, characterized by comprising, at the time of information storage,
converting the reference beam (1) and the information beam (2) into an annular reference beam which is surrounded outside the information beam (2) by the reference beam (1) and is coaxial with the information beam (2) through a spatial modulator (5), wherein the reference beam (1) and the information beam (2) are coaxial;
-modulating the information beam (2) with a two-dimensional phase modulation data page (6);
converging the reference beam (1) and the information beam (2) at a convergence point through a first convex lens (3), wherein the first convex lens (3) is coaxial with the reference beam (1) and the information beam (2);
placing a recording medium (4) at the convergence point to realize three-dimensional holographic recording of data;
when information is reproduced, laser beams emitted by a laser (9) are converted into plane light after being diverged by a second convex lens (10), and the plane light enters a spatial light modulator (5) after passing through a first reflector (11) and is converted into an annular reference beam (1); a light splitting component is arranged on an optical path before a reference light beam (1) reaches a first convex lens (3), and a receiving device is arranged on an optical axis in the reflection direction of the light splitting component, so that the data of the three-dimensional holographic record can be reproduced on the receiving device.
2. Phase modulated holographic memory reconstruction method according to claim 1, characterized in that the reference beam (1) is applied in a two-dimensional pattern of phase distribution.
3. The phase modulation holographic memory reproduction method of claim 1, characterized in that a reflective optical disk is used as the recording medium (4).
4. The phase modulation holographic memory reproduction method of claim 3, wherein the reflective optical disc is disposed in a structure including a protective layer (401), a recording layer (402), and a reflective layer (403) from top to bottom.
5. The phase modulation holographic memory reproduction method according to claim 1, wherein the spectroscopic means is a first spectroscope (7) at the time of information reproduction.
6. Phase-modulated holographic memory reproduction apparatus for implementing the phase-modulated holographic memory reproduction method according to any of claims 1-5, comprising a reference light source and an information light source, characterized in that the reference light beam (1) is converted by a spatial light modulator (5) into an annular reference light beam (1) surrounding the information light beam (2) and coaxial with the information light beam (2), and the reference light beam (1) and the information light beam (2) are coaxial; the information beam (2) adopts a two-dimensional phase modulation data page (6), and the reference beam (1) adopts a two-dimensional pattern of phase distribution; a first convex lens (3) which is coaxial is arranged in the optical axis direction of the reference beam (1) and the information beam (2), the reference beam (1) and the information beam (2) are converged by the first convex lens (3), and a recording medium (4) is arranged at the converging point to realize the three-dimensional holographic recording of data; a light splitting component is arranged on a light path before the reference light beam (1) reaches the first convex lens (3), and a receiving device is arranged on an optical axis of the light splitting component in the reflection direction.
7. The phase-modulated holographic-memory reproduction device according to claim 6, characterized in that the beam splitting means is a first beam splitter (7).
8. The phase-modulation holographic-memory reproduction apparatus according to claim 7, wherein the optical axis of the first convex lens (3) coincides with the transmission-direction optical axis of the first beam splitter (7).
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| CN1470053A (en) * | 2000-10-12 | 2004-01-21 | 光技术企业公司 | Optical information recording apparatus and method optical information reproducing apparatus and method, optical information recording/reproducing apparatus and method |
| CN1841523A (en) * | 2005-03-14 | 2006-10-04 | 汤姆森特许公司 | Data page pixel shaping for holographic recording |
| CN1862674A (en) * | 2005-05-13 | 2006-11-15 | 夏普株式会社 | Information recording apparatus, information reproducing apparatus and information recording/reproducing apparatus |
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