Coherent light generators – Particular component circuitry – Optical pumping
Patent
1996-09-12
1997-12-02
Bovernick, Rodney B.
Coherent light generators
Particular component circuitry
Optical pumping
H01S 300
Patent
active
056944098
ABSTRACT:
A semiconductor laser apparatus comprises a semiconductor laser, a photodetector, first and second variable gain units, a controllable amplifying unit, a driving unit, and a compensation unit. A control signal is supplied to one of input terminals of each of the first and second variable gain units and an output signal of the photodetector is negative-fed back to the other of the input terminals of each of the first and second variable gain units. A varied gain of an error between the control signal and the output signal is output independently of each of the first and second variable gain units. The controllable amplifying unit amplifies the error signal from the first variable gain unit with desired frequency characteristics. The driving unit includes a plurality of driving elements connected in parallel and supplies a driving current to the semiconductor laser in accordance with a drive control signal from the controllable amplifying unit. The compensation unit negatively feeds back a compensation current to the negative feedback terminals to compensate a phase delay on the basis of the error signal output from the second variable gain unit.
REFERENCES:
patent: 5280536 (1994-01-01), Dumond et al.
Taguchi, et al., "High-Precision Laser Control System (11)" Optical Disk Apparatuses of Electronics, Information and Communications Engineering, C-372, 1991 (no month). In Japanese only.
Bovernick Rodney B.
Kabushiki Kaisha Toshiba
Wise Robert E.
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