Stabilized local oscillator frequency for heterodyne laser senso

Details Stabilized local oscillator frequency for heterodyne laser senso Stabilized local oscillator frequency for heterodyne laser senso

1991-01-03

1992-11-17

Epps, Georgia Y.

Coherent light generators

Particular beam control device

Optical output stabilization

372 18, 372 19, 372 20, 356 5, 356 285, H01S 313

Patent

active

051649489

ABSTRACT:
A stabilized local oscillator frequency for heterodyne laser sensors comped of an acousto-optic crystal which provides a constant frequency offset f.sub.1, to a portion of laser transmitter power at frequency f.sub.0, for injection locking a separate local oscillator connected to a detector which simultaneously mixes f.sub.1 with the return signal f.sub.0 from a target. The detector outputs the difference frequency between f.sub.0 -f.sub.1 which is processed for the desired information. Proper local oscillator tuning is maintained through the use of a piezo-electric translator regulating the axial length of the local oscillator.

REFERENCES:
patent: 4405230 (1983-09-01), Tew et al.
patent: 4690551 (1987-09-01), Edwards et al.
patent: 4716444 (1987-12-01), Mongeon et al.
patent: 4777825 (1988-10-01), Barre et al.
patent: 4856893 (1989-08-01), Breen
patent: 4975919 (1990-12-01), Amada et al.

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