Method and device for controlling semiconductor laser

Details Method and device for controlling semiconductor laser Method and device for controlling semiconductor laser

1995-06-02

1997-06-03

Bovernick, Rodney B.

Coherent light generators

Particular beam control device

Optical output stabilization

372 38, H01S 313

Patent

active

056362331

ABSTRACT:
The present invention relates to a semiconductor laser control method used preferably for a reading control system such as a bar code reading device and to a semiconductor laser control device employing the above method. The object of the invention is to provide a semiconductor laser control device which can be controlled based on the output of a semiconductor laser, provides a stable laser output in a noise environment, enables easy output adjustment, and is immune to external thermal or electrical noises. In the semiconductor laser control method where the light amount of a light amount to current controllable semiconductor laser is subjected to a feedback control with a predetermined time constant while it is monitored, when the light amount is less than a predetermined value, the semiconductor laser is subjected to an feedback control with a first time constant. When the light amount is more than a predetermined value, the semiconductor laser is subjected to a feedback control with a second time constant.

REFERENCES:
patent: 4884280 (1989-11-01), Kinoshita
patent: 4916705 (1990-04-01), Glance
patent: 4995045 (1991-02-01), Burley et al.
patent: 5138621 (1992-08-01), Goto et al.
patent: 5253267 (1993-10-01), Johnson
patent: 5309458 (1994-05-01), Carl
patent: 5396361 (1995-03-01), Sasaki et al.
patent: 5412677 (1995-05-01), Guerin et al.

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