Coherent light generators – Particular component circuitry – Optical pumping
Patent
1988-11-08
1989-08-08
Laroche, Eugene R.
Coherent light generators
Particular component circuitry
Optical pumping
372 29, 372 31, 455608, 455613, 250205, 315149, H01S 300, H01S 313, G01J 132
Patent
active
048560111
ABSTRACT:
A system for controlling the operation of a semiconductor laser is provided. In one aspect of the present invention, a switching element, which is turned on and off in accordance with a signal modulated with image information, is connected in series with the semiconductor laser for controlling the operation thereof. In another aspect of the present invention, a semiconductor laser control system includes a photodetector for detecting the intensity of a laser beam emitted from the laser, a comparator for comparing the detected intensity with a predetermined refence intensity, an up/down counter which changes its count depending on the result of the comparison at the comparator, and a laser driver which supplies a driving current to the laser as modified by the count of the counter. A reset circuit is provided to reset the counter when at least the laser driver is powered up with a predetermined supply voltage. In addition, the laser driver is so structured that the supply of the driving current to the laser is disconnected for a predetermined time period after the power up thereof.
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Ostoich et al. Direct modulation of D. H. GaAlAs lasers with GaAs M.E.S.F.E.T.S Electronics Letters Oct. 16, 1975, vol. 11, No. 21, pp. 515-516.
Shibata Isamu
Shimada Kazuyuki
LaRoche Eugene R.
Ricoh & Company, Ltd.
Shingleton Michael B.
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