Combined AM/FM laser radar transmitter

Details Combined AM/FM laser radar transmitter Combined AM/FM laser radar transmitter

1983-12-15

1985-07-09

Sikes, William L.

Coherent light generators

Particular beam control device

Modulation

372 28, 372 31, 372 32, H01S 310

Patent

active

045286698

ABSTRACT:
A laser radar transmitter (2) has, associated with a single active lasing region (11) and preferably in the same laser cavity (1) therewith, an amplitude modulator (21) and a frequency modulator (25), which may simultaneously place continuous AM and continuous FM on a single output beam (7). Amplitude modulator (21) is preferably an EO crystal having a high EO coefficient, low loss, and field-induced birefringence. Frequency modulator (25) is preferably an EO crystal having a high EO coefficient, low loss, and a field-induced index change. Applying a d.c. driving voltage to the AM crystal (21) and an a.c. driving voltage to the FM crystal (25) produces an output beam (7) having FM. Applying an a.c. driving voltage to the AM crystal (21) produces an output beam (7) having AM, independently of whether FM is added by means of applying an a.c. driving voltage to the FM crystal (25).

REFERENCES:
patent: 3229223 (1966-01-01), Miller
patent: 3487230 (1930-12-01), Costich
patent: 3569856 (1971-03-01), Ridgway
patent: 3593188 (1971-07-01), Nussmeier
patent: 3622912 (1971-11-01), Doyle et al.
patent: 3918007 (1975-11-01), Waksberg
patent: 3940712 (1976-02-01), White
Guser et al.; "Temperature Stabilization of Optical FM-AM Discriminator", Izu Vyssh Uchebn Zaved Priborostr., vol. 23, No. 8, Aug. 1980, p.66.
Skolnik, M. I., Introduction to Radar Systems (2d ed. 1980), McGraw-Hill Book Company, pp. 95-100.

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