Automatic optical bias control for light modulators

Details Automatic optical bias control for light modulators Automatic optical bias control for light modulators

1976-06-23

1978-01-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

350157, 331 945S, 250225, G01J 120

Patent

active

040717518

ABSTRACT:
In an electro-optic laser beam modulation system wherein the polarization modulation of the laser beam is converted into intensity modulation by an analyzer positioned in the path of the beam, a pair of photo-electric detectors detects a portion of the input and output beams. A divisor registers the ratio between the intensities detected. A compensator rotates the polarization of the output beam to establish a desired ratio, and a comparison system is connected to the divisor and the compensator to maintain the desired ratio.

REFERENCES:
patent: 3556663 (1971-01-01), Cary
patent: 3742382 (1973-06-01), Smith
patent: 3780296 (1973-12-01), Waksberg et al.
patent: 3925603 (1975-12-01), Naruse

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