Spectrophone stabilized laser with line center offset frequency

Details Spectrophone stabilized laser with line center offset frequency Spectrophone stabilized laser with line center offset frequency

1982-03-31

1984-02-28

Sikes, William L.

Coherent light generators

Particular beam control device

Tuning

372 28, 372 32, H01S 310

Patent

active

044344902

ABSTRACT:
Continuous offset tuning of a frequency stabilized cw gas laser (10) is achieved by using a spectrophone (14) filled with the same gas as the laser for sensing a dither modulation, detecting a first or second derivative of the spectrophone output with a lock-in amplifier (28), the detected output of which is integrated (36), and applying the integrator output as a correction signal through a circuit (24) which adds to the dither signal from an oscillator (22) a dc offset (B1) that is adjusted with a potentiometer (26) to a frequency offset from the absorption line center of the gas, but within the spectral linewidth of the gas. Tuning about that offset frequency is achieved by adding a dc value (B2) to the detected output of the dither modulation before integration using a potentiometer (30). Tuning may also be achieved by changing the amplitude of dither modulation, or changing the pressure of the spectrophone gas, or any combination of these three tuning parameters which affect the amount of offset of the stabilized frequency from line center.

REFERENCES:
patent: 3686585 (1972-08-01), Javan et al.
patent: 3711786 (1973-01-01), Vautier et al.
patent: 3938365 (1976-02-01), Dewey, Jr.

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