Drooping elimination device for semiconductor laser

Details Drooping elimination device for semiconductor laser Drooping elimination device for semiconductor laser

1988-02-25

1989-05-30

Sikes, William L.

Coherent light generators

Particular beam control device

Having particular beam control circuit component

372 33, 372 38, H01S 313

Patent

active

048357812

ABSTRACT:
A drooping elimination device for a semiconductor laser is provided in a laser beam recording apparatus comprising a laser operation control circuit for producing a light emission level instructing signal corresponding to an image signal, and controlling a drive current for the semiconductor laser based on the light emission level instructing signal to modulate the intensity of a laser beam emitted by the semiconductor laser, and an optical output stabilizing circuit for detecting the intensity of the laser beam, and feeding a feedback signal corresponding to the detected intensity to the light emission level instructing signal. The drooping elimination device comprises a feedback line for detecting the drive current for the semiconductor laser and feeding a signal corresponding to the detected drive current to the light emission level instructing signal, and a high-pass filter having a time constant equal to the time constant of drooping characteristics of the semiconductor laser, and provided in the feedback line to receive the detected drive current.

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patent: 4647950 (1987-03-01), Nosaki et al.
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patent: 4725854 (1988-02-01), Ohtjuka et al.
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patent: 4736255 (1988-05-01), Miura et al.
patent: 4763334 (1988-08-01), Shimada et al.

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