阅读说明：本技术 相位调制式全息存储再现方法和存储再现装置 (Phase modulation type holographic memory reproduction method and memory reproduction device ) 是由 谭小地 于 2020-07-15 设计创作，主要内容包括：本发明属于信息数据存储技术领域,公开了相位调制式全息存储再现方法和存储再现装置,所述存储再现方法在信息存储时,将参考光束通过空间调制器转换为包围在信息光束外部的、且与信息光束同轴的环形参考光束；将信息光束采用二维相位调制数据页,将参考光束采用规则分布的二维图案；将参考光束和信息光束通过第一凸透镜在会聚点处会聚；将所述会聚点处放置记录媒体；在信息再现时,在参考光束到达第一凸透镜之前的光路上安装分光部件,再在所述部件的反射方向光轴上安装接收装置,使得三维全息记录的所述数据在所述接收装置上实现再现；其提高存储密度,缩小材料动态范围,提高信噪比,减小存储材料负担,实现高效的高密度数据存储。(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.)

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;

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.

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. The phase modulation holographic memory reproduction method according to claim 5, characterized in that a receiving device is installed on the optical axis in the reflection direction of the first beam splitter (7) so that the data of the three-dimensional holographic recording is reproduced on the receiving device.

7. Phase modulating holographic memory reproduction device according to any of claims 1-6, comprising a reference light source and an information light source, characterized in that the reference beam (1) is converted by a spatial light modulator (5) into an annular reference beam (1) surrounding the information beam (2) and coaxial with the information beam (2), and the reference beam (1) and the information 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.

8. Phase modulation holographic memory reproduction device according to claim 7, characterized in that the beam splitting means is a first beam splitter (7).

9. The phase-modulation holographic-memory reproduction apparatus according to claim 8, characterized in that the optical axis of the first convex lens (3) coincides with the transmission-direction optical axis of the first beam splitter (7).

10. The phase modulation holographic-memory reproduction apparatus according to claim 9, characterized in that a receiving means is installed on the reflection direction optical axis of the first beam splitter (7).

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:

reference beam 1, information beam 2, first convex lens 3, recording medium 4, protective layer 401, recording layer 402, reflective layer 403, spatial light modulator 5, two-dimensional phase modulation data page 6, first beam splitter 7, photodetector 8, laser 9, second convex lens 10, first mirror 11, image receiver 12, stop 13, third convex lens 14, fourth convex lens 15, second mirror 16, fifth convex lens 17, dichroic beam splitter 18, third mirror 19, sixth convex lens 20, second beam splitter 21, fourth mirror 22, lambda/4 wave plate 23, holographic disk 24, and semiconductor laser 25.

Detailed Description

The following description of the embodiments of the present invention refers to the accompanying drawings and examples: