Dual-wavelength laser apparatus

Details Dual-wavelength laser apparatus Dual-wavelength laser apparatus

H - Electricity

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315/24, 345/39

H01S 3/10 (2006.01) H01S 3/105 (2006.01) H01S 3/106 (2006.01) H01S 3/139 (2006.01) H01S 5/14 (2006.01) H01S 3/08 (2006.01) H01S 5/0683 (2006.01) H01S 5/40 (2006.01)

Patent

CA 1261046

ABSTRACT OF THE DISCLOSURE A dual-wavelength laser apparatus includes a laser emitting a laser beam consisting of two wavelength compo- nents, a methane cell for controlling and equalizing gains of the two wavelength components, a cavity length modulator including a piezoelectric element for periodically modulat- ing the cavity length of the laser, and a feedback circuit for controlling the modulation center such that the sum of outputs of the two modulated wavelength components is kept substantially constant. The feedback circuit includes a detector for detecting a laser output, a lock-in amplifier for detecting and amplifying an output from the detector, an integrator for integrating an output from the lock-in amplifier, and a high-voltage amplifier for generating a bias voltage set by the integrator.

505030

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