Photosensitive diodes for simplified optical heterodyning and ca

Details Photosensitive diodes for simplified optical heterodyning and ca Photosensitive diodes for simplified optical heterodyning and ca

1977-02-02

1979-05-01

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250237G, G01B 902, G01P 900

Patent

active

041520726

ABSTRACT:
Three electrically isolated photosensitive diodes on a common substrate are located directly behind a multilayer dielectric coated mirror that is one of the reflective elements of a ring laser. A small percentage of the beams incident on the mirror is allowed to pass through and strike the photosensitive diodes. Two of the diodes are masked in such a way as to detect the heterodyne beat signal of two counterrotating beams in the ring laser and generate an output signal used to determine rate of rotation of the ring laser body. The third diode sums the intensity of the counterrotating beams and generates an output signal which goes to a feedback cavity length control circuit.

REFERENCES:
patent: 3661463 (1972-05-01), Brainard et al.
patent: 3697887 (1972-10-01), Lee et al.
patent: 3779647 (1973-12-01), Dawson
"Ring Lasers: Prin. & App.," Smith et al.; Proc. Instn. Mech. Engrs., 1968-1969, vol. 183, Pt. 3D; pp. 38-42.

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