Servo-controlled optical length of mode-locked lasers

Details Servo-controlled optical length of mode-locked lasers Servo-controlled optical length of mode-locked lasers

1980-01-24

1982-02-02

Sikes, William L.

Coherent light generators

Particular beam control device

Optical output stabilization

372 38, 372102, H01S 313

Patent

active

043142117

ABSTRACT:
An acousto-optic modulator (2) is inserted into a laser cavity so that when the Bragg condition is satisfied, light will be scattered out of the cavity into two beams (101 and 102) at the same angle on opposite sides of an internal laser cavity pulse (100). Detectors (21 and 22) are disposed to intercept the two scattered pulses and yield electrical signals responsive to their intensity. When the internal laser cavity pulse is in phase with the excitation the time average intensities obtained by the detectors will be small and equal. However, should the internal laser cavity pulse be a bit late, the intensity of one of the scattered beams will increase while the other will decrease. If the internal laser cavity pulse is early, the opposite will be observed. The electrical signals are arranged to have opposite signs and their sum is used as an error signal for a closed feedback loop to adjust the optical path length of the laser cavity. A second embodiment for generating the electrical signals using dichroic pulse retarders and product detectors is also disclosed.

REFERENCES:
patent: 3529263 (1970-09-01), Simmons
patent: 3611181 (1971-10-01), Lary et al.
patent: 3613024 (1971-10-01), Gensic et al.
patent: 3686585 (1972-08-01), Javan et al.
patent: 3775699 (1973-11-01), Cassels
patent: 4103254 (1978-07-01), Chikami

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