Method and apparatus for frequency modulation stabilization of a

Details Method and apparatus for frequency modulation stabilization of a Method and apparatus for frequency modulation stabilization of a

1988-11-16

1990-03-27

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Optical output stabilization

372 18, 372 28, 372 92, 372 12, 372 13, 372 38, H01S 313

Patent

active

049127160

ABSTRACT:
A microwave oscillator frequency modulates the output of the laser system to be controlled. The modulated output passes through a molecular gas cell. The output of the molecular gas cell is detected by a square law device, which produces a signal at the desired microwave frequency only when a sideband of the modulated laser output coincides with the desired molecular transition frequency. A quadrature signal pair is produced by mixing the filtered output of the square law device with two phase-shifted signals from the microwave oscillator. The dispersion signal can be used to control the output frequency of the laser system, since its magnitude and sign are uniquely related to the required direction of correction.

REFERENCES:
patent: 3711786 (1973-01-01), Vautier et al.
patent: 4398293 (1983-08-01), Hall et al.
patent: 4468773 (1984-08-01), Seaton
patent: 4660206 (1987-04-01), Halmos et al.
patent: 4672618 (1987-06-01), Wijnzjes et al.

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