Device for the heterodyne detection of an optical image

Details Device for the heterodyne detection of an optical image Device for the heterodyne detection of an optical image

1982-09-23

1985-01-01

Schreyer, Stafford D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358209, 358212, H01N 530

Patent

active

044918674

ABSTRACT:
A device for the heterodyne detection of the image of targets illuminated by a laser, wherein the target reflects a wave .SIGMA..sub.1, which is amplified in an included refractive index variation medium also illuminated by a reference wave .SIGMA..sub.R derived from the laser to produce an amplified wave .SIGMA..sub.2. A portion of the wave .SIGMA..sub.1 prior to amplification is directed incident on a frequency shifter to produce frequency shifted wavefront .SIGMA..sub.10. Wavefront .SIGMA..sub.2 and the frequency-shifted wavefront .SIGMA..sub.10 are directed incident on the same partially reflection mirror to interfere with one another and the resultant beat interference wave is focused on a matrix of photodetectors and then filtered. This device has application to infrared image detection.

REFERENCES:
patent: 3571507 (1971-03-01), Korpel
patent: 3699245 (1972-10-01), Scott
patent: 3772457 (1973-11-01), Macovski
patent: 4152725 (1979-05-01), Beckman
Optics Communications, vol. 38, No. 4, Apr. 15, 1981, North Holl. Publ. Co., Amsterdam, J. P. Huignard et al., pp. 249-254.

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