Semiconductor laser driving apparatus to be used for optical inf

Details Semiconductor laser driving apparatus to be used for optical inf Semiconductor laser driving apparatus to be used for optical inf

1990-09-20

1991-05-21

Gonzalez, Frank

Coherent light generators

Particular beam control device

Optical output stabilization

372 26, 372 29, 372 38, H01S 3131

Patent

active

050181556

ABSTRACT:
This semiconductor laser driving apparatus for driving a semiconductor laser and to be used for an optical information recording and reproducing apparatus doing at least one of recording and reproducing information in an information recording medium by using a light from the semiconductor laser comprises an emitted light amount detecting device for detecting the emitted light amount of the semiconductor laser, an output controlling device for controlling the output of the semiconductor laser on the basis of the detected output of the emitted light amount detecting device so as to be kept constant, a driving device for feeding said semiconductor laser with an operating direct current, a high frequency superimposing device for superimposing a high frequency current on the operating direct current from the driving means, a measuring device for measuring the variation of the emitted light amount of the semiconductor laser with the variation of the operating current of the semiconductor laser in the absence of the information recording medium in the focus position of the semiconductor laser and a superimposed amount controlling device for controlling the superimposed amount by the high frequency superimposing device in response to the measured result of the measuring means.

REFERENCES:
patent: 4611352 (1986-09-01), Fujito et al.
patent: 4819240 (1989-04-01), Takiguchi et al.
patent: 4819242 (1989-04-01), Kaku et al.
patent: 47999069 (1989-01-01), Sasaki et al.

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