Electro-optical device for use in improved interferometers

Details Electro-optical device for use in improved interferometers Electro-optical device for use in improved interferometers

1976-05-25

1978-08-08

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

350172, 350174, G02B 902

Patent

active

041053362

ABSTRACT:
A device for use in an interferometer, and the combination thereof, the device itself combining the functions of filter, beam combiner, and modulator. In structure, the device includes a relatively small glass plate, which has deposited on opposite faces thereof two extremely small elliptical mirrors which each function as a reflecting spatial filter. In the improved interferometer which includes such a device, reference and signal beams are produced from a single coherent source. The signal beam is spatially filtered by the mirrors and directed to a target. The returning signal beam, reflected from the target, is combined with the reference beam by the mirrors to form a composite beam which forms interference patterns, from which can then be extracted, with extremely high resolution, information concerning the physical characteristics of the target.

REFERENCES:
patent: 3601490 (1971-08-01), Erickson
patent: 3825348 (1974-07-01), Nomarski et al.

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