Monitoring wavelength of laser devices

Details Monitoring wavelength of laser devices Monitoring wavelength of laser devices

1997-12-08

1999-09-21

Healy, Brian

Coherent light generators

Particular beam control device

Optical output stabilization

372 20, 372 23, 372 24, 372 29, 372 33, 372 38, H01S 313

Patent

active

059563567

ABSTRACT:
The invention is a circuit for monitoring the wavelength of a laser device such as a semiconductor laser. A piezoelectric resonator is positioned in the path of the light beam so as to form a Fabry-Perot cavity. The changes in the reflectivity of the cavity are detected as the resonator is driven by an oscillator circuit, and an error signal is produced in response thereto when the wavelength of the laser device strays from a desired value.

REFERENCES:
patent: 4309671 (1982-01-01), Malyon
patent: 4839614 (1989-06-01), Hill et al.
patent: 4914662 (1990-04-01), Nakatani et al.
patent: 5003546 (1991-03-01), Lidgard et al.
patent: 5825792 (1998-10-01), Villeneuve et al.

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