3D disk type hologram storage method and system

Abstract

A 3D disc holographic storage method is separation orbit storage which works as overlapping partially all holograms on adjacent orbits, recording and reading out all holograms without adjusting angle of reference light and illuminating light, using disc rotation to finalize addressing of hologram in the same orbit and using read - write optical system and disc flat motion to finalize addressing of hologram on different orbit, applying separation orbit heat - fixing as storing method. The 3D disc holographic storage system is also disclosed.

Description

technical field [0001] A three-dimensional disc holographic storage method and system belong to the technical field of optical storage. Background technique [0002] The rapid development of information science and technology has put forward higher requirements for information storage technology. Volume holographic storage technology stores and retrieves information in parallel in the entire volume of the storage medium in the form of page holograms. This feature makes it have the advantages of high storage density, large storage capacity, high data transmission rate, and short data search time. , becoming an optical storage technology for high-density data storage. [0003] Volume holographic storage using bulk photorefractive crystals as the storage medium usually adopts the method of proximal incident light path and pure angle multiplexing. However, due to the limited dynamic range of photorefractive crystals, especially the erasing effect of subsequent recording on the...

AI Technical Summary

Problems solved by technology

[0004] The three-dimensional disk storage method and system in the invention with the patent number ZL96102463.1, although the disk is used to record images in the form of tracks, the stored images in each concentric track can partially overlap each other, to a certain extent The storage density is increased, but because the images between the tracks cannot be overlapped, the hologram distribution on the entire holographic disc is densely distributed within the track and sparsely distributed between the tracks, and the storage structure on the entire storage material is uneven. , which limits the storage density of holograms

In addition, because the optical path of the object light and the reference light are not equal to the optical path of the device, it requires a long coherence length of the laser, which limits the practical application.

For materials whose storage materials are photorefractive crystals, the density and image quality of hologram storage are also deteriorated due to the erasure effect of multiple recordings of holograms.

In addition, because the three-dimensional holographic memory uses a single-mode laser, the energy of the beam spot has a Gaussian distribution, which will make the energy of the stored interference hologram uneven, bright in the center and dark around, which not only affects the quality of the stored image, but also affects the stored information. reproduction of

[0005] The current volume holographic storage devices have large volumes, complex structures, cannot be separated from the optical platform, and the optical paths of the object light and the reference light are not equal.

In addition, the storage medium cannot be reset after being removed, which affects the correct reading of its stored information.

These are not conducive to the practical application of three-dimensional holographic memory

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