Optically addressed spatial light modulator

Details Optically addressed spatial light modulator Optically addressed spatial light modulator

1993-03-22

1996-01-23

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

430 20, 430 58, 359 72, G02F 113, G02F 1135, G02F 103, G03G 1502

Patent

active

054869366

ABSTRACT:
An optically addressed spatial light modulator having a multilayer-type photo conductive layer with a charge carrier generation layer and a charge carrier transport layer having a large mobility. The light modulator also utilizes a liquid crystal composite layer including a transparent resin having a refractive index equal to the refractive index of the liquid crystal. The photoconductive layer and the liquid crystal layer are fixed to each other and the transparent electrodes are fixed to the two opposite sides of these layers. Utilizing the present invention an optically addressed spatial modulator is produced which can write with spectral light such as an infrared ray emitted from a semiconductor laser. The modulator has excellent qualities of sensitivity, light transmittance, hardness and spatial uniformity.

REFERENCES:
patent: 4060316 (1977-11-01), Pollack et al.
patent: 5170271 (1992-12-01), Lackner et al.
patent: 5200283 (1993-04-01), Nakano et al.
patent: 5208686 (1993-05-01), Fergason
patent: 5260815 (1993-11-01), Takizawa
patent: 5268779 (1993-12-01), Shigeta et al.

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