Semiconductor laser operating circuit

Details Semiconductor laser operating circuit Semiconductor laser operating circuit

1990-02-06

1991-01-01

Davie, James W.

Coherent light generators

Particular beam control device

Optical output stabilization

372 29, 372 38, H01S 313

Patent

active

049824074

ABSTRACT:
A semiconductor laser operating circuit comprises a signal limiting circuit which receives a beam intensity instructing signal, and limits values of the beam intensity instructing signal, which are larger than a predetermined value, to the predetermined value. A high-pass filter extracts high frequency components from the output of the signal limiting circuit. A monitor circuit detects the intensity of a laser beam produced by a semiconductor laser, and generates a signal representing the detected intensity. An adding and subtracting circuit adds the value of the output of the high-pass filter to the value of the beam intensity instructing signal, and calculates the difference between the value obtained from the addition and the value of the signal representing the detected intensity, which signal has been generated by the monitor circuit. The semiconductor laser is controlled by the output of the adding and subtracting circuit.

REFERENCES:
patent: 4733398 (1988-03-01), Shibagaki et al.
patent: 4796267 (1989-01-01), Yamada et al.
patent: 4849989 (1989-07-01), Shoji et al.

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