High speed photorefractive image comparator

Details High speed photorefractive image comparator High speed photorefractive image comparator

1988-07-05

1990-05-01

Scott, Jr., Leon

Optics: measuring and testing

By particle light scattering

With photocell detection

G01B 9021

Patent

active

049213539

ABSTRACT:
A phase conjugate interferometer for combining first and second two dimensional images includes a source of coherent light and a first beam splitter for dividing the coherent light into a transmitted beam and a reflected pump beam. A second beam splitter divides the transmitted beam into a reflected first probe beam which traverses a first image transparency and a transmitted second probe beam which traverses a second image transparency. A nonlinear optical medium receives the reflected pump beam, the first probe beam, and the second probe beam, with the medium, the pump beam, and the probe beams being oriented such that self-pumping of the reflected pump beam produces counterpropagating pump beams, four-wave mixing between the counterpropagating pump beams and the first probe beam produces a phase-conjugated first output beam which traverses the first image transparency, and four-wave mixing between the pump beam and the second probe beam produces a phase-conjugated second output beam which traverses the second image transparency. The second beam splitter, the first output beam, and the second output beam are oriented such that a portion of the first output beam is transmitted by the second beam splitter and combines with a portion of the second output beam reflected by the second beam splitter to produce a combined output beam containing the difference between the intensities of the first and second image transparencies.

REFERENCES:
patent: 4025195 (1977-05-01), Ebersole et al.
patent: 4082429 (1978-04-01), Ward, III et al.
patent: 4082431 (1978-04-01), Ward, III
patent: 4124278 (1978-11-01), Grinberg et al.
patent: 4212536 (1980-07-01), Beneze et al.
patent: 4227805 (1980-10-01), Schiller
patent: 4277137 (1981-07-01), Upatnieks et al.
patent: 4320966 (1982-03-01), Reyblatt
patent: 4372649 (1983-02-01), Kellie
patent: 4500855 (1985-02-01), Feinberg
patent: 4571080 (1986-02-01), Papuchon et al.
patent: 4575245 (1986-03-01), Borde
patent: 4575247 (1986-03-01), Tansey
patent: 4637056 (1987-01-01), Sherman et al.
patent: 4651297 (1987-03-01), Schlunt
patent: 4765740 (1988-07-01), Fischer
Aub-Mostafa, et al., Optical Neural Computers, Scientific American, p. 88 (Mar., 1987).
Anderson, et al., Optical Tracking Novelty Filter, Optics Letters, vol. 12, p. 123 (1987).
Chiou, et al., Parallel Image Subtraction Using a Phase-Conjugate Michelson Interferometer, Optics Letters, vol. 11, p. 306 (1986).
Feinberg, Continuous-Wave Self-Pumped Phase Conjugator with Wide Field of View, Optics Letters, vol. 8, p. 480 (1983).
Feinberg, Self-Pumped, Continuous-Wave Phase Conjugator Using Internal Reflection, Optics Letters, vol. 7, p. 486 (1982).
Indebetouw, Real-Time Incoherent Subtraction of Irradiance, Applied Optics, vol. 19, p. 1218 (1980).
Ja, Real time Image Subtraction in Four-Wave Mixing with Photorefractive Bi.sub.12 OBeO.sub.20 Crystals, Optics Communications, vol. 42, p. 377 (1982).
Kwong, et al., Real Time Image Subtraction and "Exclusive OR" Operation Using a Self-Pumped Phase Conjugated Mirror, Applied Physics Ltrs., vol. 48, p. 201 (1986).
Patorski, Subtraction and Addition of Optical Signals Using a Double-Grating Shearing Interferometer, Optics Communications, vol. 29, p. 13 (1979).
Yu, et al, Incoherent Image Addition and Subtraction: A Technique, Applied Optics, vol. 18, p. 2705 (1979).

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