Optical heterodyne detection system and method

Details Optical heterodyne detection system and method Optical heterodyne detection system and method

1979-10-24

1981-12-15

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

350 381, G01B 902

Patent

active

043056660

ABSTRACT:
A system to achieve heterodyne detection of optical (i.e., infrared, visible and ultraviolet) signal wavefront is disclosed. The system employs a holographic phase grating that, when illuminated by laser radiation, will generate a plurality of wavefronts each of which has a predetermined spatial distribution of amplitude and phase. The grating is part of an optical local oscillator that includes a laser that illuminates the holographic phase grating. The system further includes a mechanism to receive an optical-signal wavefronts and combine this wavefront with a plurality of local-oscillator wavefronts to provide combined optical wave fields that are applied as input to an array of discrete detector elements; each detector of the array optimally mixes the one local-oscillator wavefront directed to it with the optical-signal wavefront and generates therefrom an electrical output with optimum detection efficiency and with optimum amplitude and fixed phase relationships to the outputs of the other detectors of the array. The optical heterodyne array detection system produces detection of a plurality of optical-signal, spatial-resolution elements simultaneously.

REFERENCES:
patent: 3939342 (1976-02-01), Bezerie et al.
Inaba et al., "Infrared Laser Radar Technique using Heterodyne Detection for Range-Resolved Sensing of Air Pollutants", Optics Communications, vol. 14, pp. 119-122, May 1975.

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