Coherent light generators – Particular component circuitry – Optical pumping
Patent
1992-09-14
1994-02-08
Bovernick, Rodney B.
Coherent light generators
Particular component circuitry
Optical pumping
H01S 300
Patent
active
052854647
ABSTRACT:
Disclosed is a driving apparatus of a laser diode, comprising a light detection circuit serial-connected with a pin diode detecting the intensity of the emission of light from the laser diode, the light detection circuit producing a signal depending on the intensity of the emission detected by the pin diode, a modulation circuit serial-connected with the laser diode, the output current of the modulation circuit varying depending on the difference between an input signal and the signal outputted from the light detection circuit, and a constant voltage drop device disposed in the series circuit including the laser diode and the modulation circuit, the constant voltage drop device causing a voltage drop of a certain degree regardless of the strength of a current flowing thereto. A Zener diode having Zener voltage equivalent to the dropped constant voltage or having at least one diode which generates forward voltage drop equivalent to the dropped constant voltage or the like is used as the above constant voltage drop device, the device being disposed, for example, between the laser diode and the modulation circuit.
REFERENCES:
patent: 4734914 (1988-03-01), Yoshikawa
patent: 4813048 (1989-03-01), Yamane et al.
patent: 5050177 (1991-09-01), Ema
patent: 5068545 (1991-11-01), Molnar
patent: 5115147 (1992-05-01), Kusano et al.
patent: 5163063 (1992-11-01), Yoshikawa et al.
patent: 5182756 (1993-01-01), Waki et al.
Bovernick Rodney B.
Minolta Camera Kabushiki Kaisha
Wise Robert E.
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