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Spatial light modulator and holographic recording/reproducing apparatus

A spatial light modulator and spatial modulation technology, applied in optical recording/reproduction/erasing methods, digital recording/reproduction, optical recording/reproduction, etc., can solve the problem of difficult high-speed recording/reproduction, long-term Time, worry and other issues, to achieve the effect that the beam intensity distribution is basically uniform

Inactive Publication Date: 2004-11-03
TDK CORPARATION
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] However, in the above method of irradiating while scanning a thin laser beam onto the SLM, it takes a long time to irradiate the entire SLM with the beam, making it difficult to achieve high-speed recording / reproduction
Meanwhile, in a method utilizing a pair of nonlinear optical elements, it is necessary to provide such an optical element, thereby increasing the size of the entire optical system
Furthermore, it only works for a specific intensity distribution, leading to concerns about an insufficient degree of waveform shaping

Method used

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  • Spatial light modulator and holographic recording/reproducing apparatus
  • Spatial light modulator and holographic recording/reproducing apparatus
  • Spatial light modulator and holographic recording/reproducing apparatus

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Embodiment Construction

[0023] Referring to the accompanying drawings, a preferred embodiment of the present invention will be described in detail below.

[0024] figure 1 is a typical view showing the structure of a spatial light modulator according to a preferred embodiment of the present invention.

[0025] Such as figure 1 As shown, a spatial light modulator (SLM) 101 is of the transmissive type having a plurality of pixels 101a arranged in a grid. The intensity of the beam is spatially modulated by selecting the transmissive state (on) or blocking state (off) of light at each pixel. For example, a transmissive type spatial light modulator may utilize a liquid crystal device.

[0026] The spatial light modulator 101 has a light transmittance distribution 101x in which the light transmittance is relatively low at the center and its surroundings on all pixels, and increases as the distance from the center increases in a manner approximately inversely proportional to the Gaussian distribution 102...

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Abstract

A spatial light modulator (SLM) (101) has a multiplicity of pixels (101a) arranged in a lattice form for selecting a transmission state (on) and a blocking state (off) of light on each pixel thereby spatially modulating light intensity. The spatial light modulator (101) has a light transmissivity distribution over whole pixels set such that a light transmissivity is lower at and around a center and increased with increasing distance from the center.

Description

Background of the invention [0001] The present invention relates to a spatial light modulator and a holographic recording / reproducing device, and more particularly to a spatial light modulator and a holographic recording / reproducing device capable of suppressing wasteful consumption of sensitivity of a holographic recording medium material and preventing crosstalk. Background technique [0002] The holographic recording / reproducing method is considered as a method for realizing high-density information recording. In a general holographic recording / reproducing method, a signal beam to which data is appended two-dimensionally overlaps a reference beam within a recording medium. The formed interference fringes are written, thereby recording the information. The data thus recorded on the holographic recording medium can be reproduced by irradiating with the reference beam. The reference beam irradiated on the recording medium is refracted by the grating of interference fringes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01G03H1/04G03H1/26G11B7/128G11B7/1369G11B7/1398
CPCG03H1/0465G11B7/0065G11B7/1369G03H2225/31G03H1/0486G02F1/133509G02F2203/12G11B7/1398G11B7/128H04W4/44H04W4/029G11B20/10G11B27/34G11B2220/2562
Inventor 越拓哉
Owner TDK CORPARATION
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