Optical frequency modulation demodulator

Details Optical frequency modulation demodulator Optical frequency modulation demodulator

1975-09-08

1976-09-07

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

250199, 329144, 329DIG1, G02F 200

Patent

active

039796868

ABSTRACT:
A laser beam frequency modulation demodulator is disclosed utilizing the highly linear frequency versus voltage characteristic of the absorption resonance provided by a Stark-effect cell. An error signal, generated by dither modulation of the Stark-effect cell voltage, is fed back to the Stark-effect cell via a low-pass filter to cause the absorption resonance to track the instantaneous frequency of the laser beam. The feedback signal applied to the Stark-effect cell has an amplitude proportional to the frequency modulation on the laser beam.

REFERENCES:
patent: 3654473 (1972-04-01), Nussmeier
patent: 3921099 (1975-11-01), Abrams et al.
patent: 3939341 (1976-02-01), Graves

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