Electro-optic holographic storage device having unlimited record

Details Electro-optic holographic storage device having unlimited record Electro-optic holographic storage device having unlimited record

1976-05-18

1977-12-20

Stern, Ronald J.

Static information storage and retrieval

Magnetic bubbles

Guide structure

365125, G02B 2700, G11C 1142

Patent

active

040637956

ABSTRACT:
The present invention relates to a holographic optical storage device utilizing a material in which the transfer of photo-induced charges is orientated along the cristallographic axis C of the material. On the faces of the material perpendicular to said axis, two transparent electrodes connected together are arranged so that the field developed between said two faces is zero whatever the uniform illumination superimposed upon the modulation. The selective erasing of a first induced spatial variation in refractive index is achieved by recording a second spatial variation which is the complement of the first, the number of successive record-erase cycles being unlimited.

REFERENCES:
patent: 3652145 (1972-03-01), Thaxter
patent: 3703328 (1972-11-01), Glass et al.
patent: 3978458 (1976-08-01), Vergnolle et al.
Chen et al., "Holographic Storage in Lithium Niobate," Applied Physics Letters, vol. 13, No. 7, Oct. 1968, pp. 223-225.
Phillips et al., "Optical and Holographic Storage Properties of...", RCA Review, vol. 33, Mar. 1972, pp. 94-109.
Huignard et al., "Coherent Selective Erasure of Superimposed..., " Applied Physics Letters, vol. 26, No. 5, Mar. 1975, pp. 256-258.
Huignard et al., "Control of Sensitivity to Hologram Storage in LiNbO.sub.3...", Optics Communications, vol. 16, No. 1, Jan. 1976, pp. 80-82.

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