Laser Doppler frequency control

Details Laser Doppler frequency control Laser Doppler frequency control

1988-12-28

1994-01-04

Bentley, Stephen C.

Coherent light generators

Particular beam control device

Optical output stabilization

372020, H01S 310

Patent

active

052766969

ABSTRACT:
A pulse Doppler, laser radar as described which includes master laser whose output Fo is shifted in frequency by dF(t) during its amplification. The dF(t) frequency shift is compensated by providing a modulator which modulates the master laser output frequency Fo with a local oscillator signal Fl. A first mixer is provided which combines the shifted master laser frequency signal and the local oscillator modulated, master laser output so as to eliminate the master laser frequency Fo from the combined signals. A second mixer is provided for combining the reflected, Doppler shifted laser signal with the local oscillator modulated, master laser output signal Fo+Fl to eliminate the master laser output frequency Fo from the combined signal. Additional detection circuitry is provided to determine the difference in frequencies of the combined signals from the first and second mixers so as to isolate the Doppler shift signal from the amplifier-induced shift dF(t). An additional frequency control subsystem for the master laser is also described which employs an absorption cell in the feedback loop.

REFERENCES:
patent: 3686585 (1972-08-01), Javan et al.
patent: 3899748 (1975-08-01), Bodlaj
patent: 4823354 (1989-04-01), Znotins et al.
patent: 4833681 (1989-05-01), Akiyama et al.
patent: 4912716 (1990-03-01), Mead

Affiliated with

Also associated with

Rating

Laser Doppler frequency control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Laser Doppler frequency control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laser Doppler frequency control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-313316