Coherent light generators – Particular beam control device – Optical output stabilization
Patent
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.
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Iwaguchi Isao
Ohtsuki Munenori
Sato Shin'ichi
Shinoda Ichiro
Bovernick Rodney B.
Fujitsu Limited
Song Yisun
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