Coherent light generators – Particular component circuitry – Optical pumping
Patent
1994-09-15
1995-07-04
Bovernick, Rodney B.
Coherent light generators
Particular component circuitry
Optical pumping
H01S 300
Patent
active
054307490
ABSTRACT:
An inverter inverts the polarity of a laser diode driving signal LDS, and a delay circuit delays the laser diode driving signal LDS by the time required for the polarity inversion by the delay circuit. Conduction of first and second switching elements are differentially controlled in accordance with the inversion signal *LDS and a delay signal LDD. When the first switching element is on and the second switching element is off, a driving current Id is supplied to a laser diode so as to emit light. On the other hand, when the first switching element is off and the second switching element is on, a current is supplied to an impedance element, while the driving current Id becomes zero, and the light is extinct. Thus, it is possible to adjust the time for rise and the time for fall of the inversion signal *LDS to be respectively equal to the time for fall and the time for rise of the delay signal LDD, to prevent overshoot of the driving current Id and, hence, overshoot of a light emission power, and to adjust the light emission time of the laser diode to the preset time.
REFERENCES:
patent: 3925735 (1975-12-01), Ozeki et al.
patent: 4807239 (1989-02-01), Takano et al.
patent: 5349595 (1994-09-01), Ogawa et al.
Bovernick Rodney B.
Fujitsu Limited
Wise Robert E.
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