Cavity length control apparatus for a multi-oscillator

Details Cavity length control apparatus for a multi-oscillator Cavity length control apparatus for a multi-oscillator

1988-03-14

1990-10-16

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

049630261

ABSTRACT:
An apparatus and method for controlling the length of a multioscillator cavity. A photodiode mixes a pair of beams rotating in the same direction, one of said beams being substantially left circularly polarized, and the other beam being substantially right circularly polarized. A local oscillator causes the mixed beams to be modulated. An amplitude demodulator demodulates the modulated beams. An error detecting device responds to the amplitude demodulators, and an active integrator integrates the detected error. A piezotransducer responds to the output of the integrator for controlling the length of the multioscillator cavity.

REFERENCES:
patent: 3937578 (1976-02-01), Andringa
patent: 4006989 (1977-02-01), Andringa
patent: 4123162 (1978-10-01), Sanders
patent: 4152071 (1979-05-01), Podgorski
patent: 4652132 (1987-03-01), Nelson et al.

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