Coherent light generators – Particular beam control device – Having particular beam control circuit component
Patent
1988-11-14
1989-08-01
Davie, James W.
Coherent light generators
Particular beam control device
Having particular beam control circuit component
250205, 372 31, H01S 313
Patent
active
048539341
ABSTRACT:
A semiconductor laser control apparatus comprises a light receiving part for receiving a laser beam emitted from a semiconductor laser, a comparator for comparing an output signal of the light receiving part and a reference signal having a level corresponding to a desired target value of the optical output, a clock generator for generating clock pulses, an up-down counter for counting the clock pulses and carrying out one of an up-count and a down-count responsive to a first control signal, a control part for controlling the clock generator and the up-down counter responsive to an error signal from the comparator, and a driving part for driving the semiconductor laser by supplying a current proportional to a counted value of the up-down counter. The control part outputs the first control signal which determines one of the up-count and the down-count depending on whether an output signal level of the light receiving part is lower or higher than the level of the reference signal and outputs a second control signal which is supplied to the clock generator and variably controls a frequency of the clock pulses depending on an absolute value of the error signal.
REFERENCES:
patent: 4618958 (1986-10-01), Shibata et al.
patent: 4718068 (1988-01-01), Yoshikawa
patent: 4734914 (1988-03-01), Yoshikawa
patent: 4745609 (1988-05-01), Yoshikawa
patent: 4754460 (1988-06-01), Kimura et al.
patent: 4763334 (1988-08-01), Shimada et al.
Davie James W.
Ricoh & Company, Ltd.
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