Coherent light generators – Particular beam control device – Producing plural wavelength output
Patent
1986-03-20
1988-05-17
LaRoche, Eugene R.
Coherent light generators
Particular beam control device
Producing plural wavelength output
372 26, 372 28, 372 29, 372 32, H01S 310, H01S 313
Patent
active
047456060
ABSTRACT:
A dual-wavelength laser apparatus includes a laser emitting a laser beam consisting of two wavelength components, a methane cell for controlling and equalizing gains of the two wavelength components, a cavity length modulator including a piezoelectric element for periodically modulating 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.
REFERENCES:
patent: 4434490 (1984-02-01), Kavaya et al.
patent: 4504950 (1985-03-01), Auyeung
patent: 4606031 (1986-08-01), Beene et al.
Moore, "Gas-Laser Frequency Selection by Molecular Absorption", Applied Optics Letters to the Editor, vol. 4, No. 2, Feb. 1965, pp. 252-253.
Yocom et al., "A Study of Selective Absorbers for Single-Mode Operation of CO.sub.2 TEA Lasers", IEEE Journal of Quantum Electronics, vol. QE-16, No. 11, Nov. 1980, pp. 1192-1194.
Matsumoto, "Stabilization Method of an Infrared Two-Wavelength Laser", Applied Physics 24, No. 1, pp. 65-66, Jan. 1981.
Bagayev et al., "Narrow Resonances in Radiation Spectrum of the He-Ne Laser with Methane Absorber", Applied Physics 10, No. 3, pp. 231-235, Jul. 1976.
Tai Hideo
Tanaka Hiroaki
Uehara Kiyoji
Ueki Takashi
LaRoche Eugene R.
Shingleton Michael B.
Tokyo Gas Co. Ltd.
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