Laser beam recording apparatus

Details Laser beam recording apparatus Laser beam recording apparatus

1988-02-19

1989-05-16

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Having particular beam control circuit component

369 33, 372 38, H01S 313

Patent

active

048316261

ABSTRACT:
A laser beam recording apparatus is provided with a laser operation control circuit for controlling a drive current for a semiconductor laser based on a light emission level instructing signal to modulate the optical intensity of a laser beam emitted by the semiconductor laser, an optical output stabilizing circuit for feeding a feedback signal corresponding to a detected intensity of the laser beam to the light emission level instructing signal, a gain adjuster provided in the optical output stabilizing circuit, and a gain controller for controlling the gain adjuster based on the light emission level instructing signal to compensate for fluctuations in a differential quantum efficiency of the semiconductor laser, and maintaining constant the gain of the optical output stabilizing circuit. Or, the laser operation control circuit is provided with the optical output stabilizing circuit, and a gain adjuster is provided in the optical output stabilizing circuit.

REFERENCES:
patent: 4516242 (1985-05-01), Yokota
patent: 4581617 (1986-04-01), Yoshimoto et al.
patent: 4663760 (1987-05-01), Shimada et al.
patent: 4710779 (1987-12-01), Funaki et al.
patent: 4740939 (1988-04-01), Kimura et al.

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