Holographic data storage device with single-arm structure

A data storage device and holographic technology, applied in the field of optical holographic storage, can solve problems such as compactness and anti-interference stability defects, and achieve the effects of improving overall stability, reducing system volume, and reducing costs

Pending Publication Date: 2020-04-10
GUANGDONG AMETHSTUM STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this system, the signal light is processed through the signal arm, and the reference light is processed through the reference arm. It is a holographic storage system with two arms physically separated. This optical system with two arms physically has the advantages of compactness and anti-interference stability. It is a key problem that needs to be solved urgently in practical application.

Method used

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  • Holographic data storage device with single-arm structure
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  • Holographic data storage device with single-arm structure

Examples

Experimental program
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Embodiment 1

[0025] figure 2 A single-arm structure holographic storage system based on a digital micromirror device (DMD) provided for this embodiment, the main components are as follows: a light source emitter 10; a beam expander 20; first and second half-wave plates 31, 32; First and second polarizing beam splitters 41, 42; first and second mirrors 51 and 52; spatial light modulator 60; reference beam 70; signal beam 80; relay lens 90; low-pass filter 100; 1. Second Fourier lenses 111 and 112 ; condenser lens 120 ; storage medium 130 ; photodetector 140 .

[0026] The holographic data storage device with a single-arm structure adopted in this embodiment includes a laser output unit 1, a beam combining unit 2, a reference arm 4, a beam splitting unit 3, and a signal reproduction unit 5. The laser output unit 1 is used to output light, and Carry out beam expansion processing; the light after beam expansion processing enters the beam combining unit 2, converts the input light into coaxia...

Embodiment 2

[0034] image 3 A liquid crystal device (LCD)-based single-arm structure holographic storage system provided for this embodiment has the following main components: laser 10; beam expander 20; first and second half-wave plates 31 and 32; first and second Two polarization beam splitters 41, 42; first and second mirrors 51 and 52; spatial light modulator 60; reference beam 70; signal beam 80; relay lens 90; low-pass filter 100; first and second Fourier lenses 111, 112; condenser lens 120; optical disc 130; photodetector 140; first and second quarter-wave plates 151, 152.

[0035] The holographic data storage device with a single-arm structure used in this embodiment is basically the same as that in Embodiment 1, except that the beam combining unit 2 in this embodiment also includes a first quarter-wave plate 151 and a second quarter wave plate 152 .

[0036] In this embodiment, the light emitted by the laser 10 is split into a vertically polarized reflected reference beam 70 an...

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Abstract

The invention relates to a holographic data storage device with a single-arm structure, and belongs to the technical field of optical holographic storage. According to the device disclosed by the invention, one part of a reference arm and one part of a signal arm are integrated together to form the single-arm structure, so that the number of optical and mechanical elements can be reduced, the system volume is reduced under the condition that the performance is not reduced, and the cost is reduced; and the signal light beam and the reference light beam share the same relay lens, so that the influence of environmental interference on the two light beams is equal, and the stability of the whole system is improved.

Description

technical field [0001] The present invention relates to the technical field of optical holographic storage, and more particularly, to a holographic data storage device with a single-arm structure. Background technique [0002] In order to use the spherical reference beam for shift multiplexing holographic storage, the laser is used as the light source, and the beam splitter is divided into a signal beam and a reference beam. These beams will pass through different optical paths, and then interfere on the storage medium to form a hologram. record information, such as figure 1 shown. [0003] figure 1 It is a structural diagram of the optical system of a traditional double-arm structure data storage device. After the laser beam emitted by the laser is expanded to adjust the polarization direction, it is split by the polarization beam splitter. The transmitted signal beam is loaded with the input signal by the spatial light modulator and then imaged by the relay lens; the re...

Claims

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Application Information

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IPC IPC(8): G11B7/1372G11B7/1353G11B7/0065
CPCG11B7/1372G11B7/1353G11B7/0065G11B7/1395G11B7/1381G11B7/083
Inventor 郑穆罗铁威田军胡德娇刘义诚
Owner GUANGDONG AMETHSTUM STORAGE TECH CO LTD
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