Photorefractive holographic interference novelty filter

Optical: systems and elements – Holographic system or element – Having particular recording medium

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359 1, 359 10, 359 25, 359300, G03H 102

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active

055350240

ABSTRACT:
A novelty filter utilizes self-nulling and self-aligning of reflection and transmission phase conjugate beams. A photorefractive crystal is arranged so that the contributions to the phase conjugate are equal and opposite in the steady state to produce destructive interference when the input image is stationary, and thus no output image is displayed. If the image moves, then the gratings will rewrite and erase themselves, each with their own response times, total destructive interference will not occur, and transient enhancement and surpression of the phase conjugate output signal will indicate the direction of motion of the input image.

REFERENCES:
patent: 4948212 (1990-08-01), Cheng et al.
patent: 5018852 (1991-05-01), Cheng et al.
Abstract published at a conference CLEO 90, held Tuesday May 22 of 1990.
Paper authored by the applicants and Mark Cronin-Golomb, entitled "Photorefractive Holographic Interference Novelty Filter", dated 1 May 1991, published by Optics Communications.

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