System for transmitter frequency control in coherent ladar

Details System for transmitter frequency control in coherent ladar System for transmitter frequency control in coherent ladar

1979-08-06

1980-12-23

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

331 945C, 331 945M, 331 945S, G01C 308, H01S 300

Patent

active

042407460

ABSTRACT:
A system for ensuring that the transmitted pulse of a coherent ladar is at the correct frequency for coherent detection of received echoes. A hybrid laser transmitter has its continuous mode signal frequency swept through the stabilized frequency of a local oscillator laser. At the instant when the frequency of the transmitter is at a predetermined difference from the frequency of the local oscillator, a high powered output signal is pulsed in the hybrid laser. The resulting reflected, received signals can be mixed with the continuous local oscillator signal in a crystal mixer to produce pulses at the intermediate frequency for amplification and detection. The effect of random variation in frequency of both the local oscillator and hybrid laser is thus avoided.

REFERENCES:
patent: 3471803 (1969-10-01), Forster
patent: 3790278 (1974-02-01), Buczek et al.
patent: 3950100 (1976-04-01), Keene et al.

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