Apparatus and method for controlling the light intensity of a la

Details Apparatus and method for controlling the light intensity of a la Apparatus and method for controlling the light intensity of a la

1991-08-06

1992-06-16

Lee, John D.

Coherent light generators

Particular component circuitry

Optical pumping

372 31, H01S 314

Patent

active

051230240

ABSTRACT:
A closed loop circuit for controlling the intensity of light emitted by a laser diode. A portion of the light emitted by the laser diode is used as an optical feedback signal and applied to a photodetector. The difference between a current produced by the photodetector and a reference current is an error current which is passed via a low impedance path to an integrating amplifier. The integrated error current is used to control the current flowing through the laser diode, thereby controlling the intensity of light emitted.

REFERENCES:
patent: 4625315 (1986-11-01), Lemberger et al.
patent: 4709369 (1987-11-01), Howard
patent: 4733398 (1988-03-01), Shibagaki et al.
patent: 4768198 (1988-08-01), Deki
patent: 4837787 (1989-06-01), Takesue et al.
patent: 4887271 (1989-12-01), Taylor
patent: 4916706 (1990-04-01), Ohashi
patent: 4945541 (1990-07-01), Nakayama
patent: 4949345 (1990-08-01), Luijtjes
patent: 5019769 (1991-05-01), Levinson
patent: 5050177 (1991-09-01), Ema
"Laser Diode User's Manual", Sharp Corporation, Sep. 1988, pp. 31-32.

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