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Phase modulation type holographic storage and reproduction method and storage and reproduction device

A phase modulation, holographic storage technology, applied in optical recording/reproducing/erasing methods, information storage, recording information storage, etc., can solve problems such as uneven consumption, additional noise, and reduction of signal-to-noise ratio.

Active Publication Date: 2020-10-23
谭小地
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems in the prior art that the consumption of the above-mentioned materials is extremely uneven, which increases the degree of distortion of holographic recording, causes additional noise, reduces the signal-to-noise ratio, and reduces the storage density, the present invention provides a phase modulation holographic storage and reproduction method and storage playback device

Method used

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  • Phase modulation type holographic storage and reproduction method and storage and reproduction device
  • Phase modulation type holographic storage and reproduction method and storage and reproduction device
  • Phase modulation type holographic storage and reproduction method and storage and reproduction device

Examples

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Embodiment 1

[0033] A kind of phase modulation type holographic storage reproduction method, see figure 1 , when storing information, includes the following steps,

[0034] Converting the reference beam 1 and the information beam 2 through the spatial modulator 5 into an annular reference beam surrounded by the reference beam 1 outside the information beam 2 and coaxial with the information beam 2, and the reference beam 1 and the information beam 2 are coaxial;

[0035] see figure 2 and image 3 , the information beam 2 adopts two-dimensional phase modulation data page 6, and the reference beam 1 can also adopt a two-dimensional pattern of phase distribution, and both or one of them belong to the pattern of phase distribution;

[0036] The reference beam 1 and the information beam 2 are converged at the convergence point through the first convex lens 3, and the first convex lens 3 is coaxial with the reference beam 1 and the information beam 2;

[0037] A recording medium 4 is placed ...

Embodiment 2

[0042] For the phase modulation holographic storage and reproduction method and storage and reproduction device of Embodiment 1, see Figure 6 , the recording medium 4 adopts a reflective optical disc. The reflective optical disc is arranged as a structure including a protective layer 401 , a recording layer 402 and a reflective layer 403 from top to bottom.

[0043] Also, see Figure 5In the above-mentioned phase modulation holographic storage and reproduction method, when information is reproduced, 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 optical axis of the first beam splitter 7 in the transmission direction. A receiving device is installed on the optical axis of the reflection direction of the first beam splitter 7, so that the data recorded in the three-dimensional hologram can be reproduced on the receiving device.

[0044] Cor...

Embodiment 3

[0046] For the phase modulation holographic storage and reproduction method described in Embodiment 1 or Embodiment 2, see Figure 7 , when information is reproduced, the laser beam emitted by the laser 9 passes through the second convex lens 10 after divergence and is converted into a plane light, and the plane light enters the spatial light modulator 5 after passing through the first reflector 11 and is converted into a ring-shaped reference beam 1 , the reference beam 1, after passing through the first beam splitter 7, passes through the fourth convex lens 15, the second reflecting mirror 16 and the fifth convex lens 17 in turn and reaches the dichroic beam splitter 18, wherein the fourth convex lens 15 and the fifth convex lens 17 form a translation The lens group, after passing through the dichroic beam splitter 18, after passing through the λ / 4 wave plate 23 and the fourth mirror 22, converges on the holographic disc 24 through the first convex lens 3 for information repr...

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Abstract

The invention belongs to the technical field of information data storage, and discloses a phase modulation type holographic storage and reproduction method and a storage and reproduction device, and the method comprises the steps of enabling a reference light beam to be converted into an annular reference light beam which surrounds the exterior of an information light beam and is coaxial with theinformation light beam through a spatial modulator during the information storage; using two-dimensional phase modulation data pages for the information light beams, and using regularly-distributed two-dimensional patterns for the reference light beams; converging the reference light beam and the information light beam at a convergence point through a first convex lens; placing a recording mediumat the convergence point; during information reproduction, installing a light splitting component on a light path before a reference light beam reaches a first convex lens, and installing a receivingdevice on an optical axis of the component in the reflection direction, so that data recorded by three-dimensional holography is reproduced on the receiving device; according to the invention, the storage density is improved, the dynamic range of materials is reduced, the signal-to-noise ratio is increased, the burden of the storage materials is reduced, and efficient high-density data storage isachieved.

Description

technical field [0001] The invention belongs to the technical field of information data storage, and in particular relates to a phase modulation holographic storage and reproduction method and a storage and reproduction device. Background technique [0002] At present, the development of the big data era puts forward higher requirements for storage methods and storage devices. The density of traditional magnetic storage technology has reached the physical limit, and its medium life is too short; while traditional optical storage has a long life, but its recording density depends on Due to the size of the lithography spots on the optical disc, the lithography spots must be separated and cannot be covered and interlaced. In addition, the existing lithography spot size has reached the physical limit, and smaller lithography spots cannot be produced; holographic storage is Known as a new generation of storage technology, it uses amplitude modulation for information storage, resu...

Claims

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Application Information

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IPC IPC(8): G11B7/005G11B7/0065G11B7/128G11B7/1372G11B7/1395G11B7/24035G11B7/24062G11B7/242
CPCG11B7/005G11B7/0065G11B7/128G11B7/1372G11B7/1395G11B7/24035G11B7/24062G11B7/242
Inventor 谭小地
Owner 谭小地
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