Chirp laser stabilization system

Details Chirp laser stabilization system Chirp laser stabilization system

1984-07-02

1987-04-21

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Modulation

372 12, 372 21, 372 32, 372 20, H01S 310

Patent

active

046602062

ABSTRACT:
A chirp laser system includes an intracavity electro-optical crystal modulated at a relatively high frequency, for example 250 kilohertz, to sweep the frequency of the transmitter laser above and below its nominal center frequency. One of the mirrors of the laser transmitter is adjustable to vary the length of the cavity and to shift the frequency of the transmitter laser. When the frequency of the transmitter laser is shifted, the output amplitude of the laser changes. With the center frequency of the laser at a maximum gain point, the amplitude of the output signals during positive and negative frequency excursions of the transmitter laser will be substantially symmetrical. However, if thermal or other effects cause the frequency of the laser to shift away from the maximum gain point, the output during positive and negative excursions will be asymmetrical. A small part of the output from the transmitter laser is sampled, and the amplitude during positive and negative frequency shift excursions is compared, using a square wave derived from the chirp modulating driver. Where the detected signals for the positive and negative frequency excursions are substantially equal, no change in the position of the mirror is accomplished; however, when the excursions result in a difference in the amplitude of the detected signals, the position of the piezoelectrically adjustable mirror is shifted to restore the nominal center frequency of the laser to its maximum amplitude point on the gain curve.

REFERENCES:
patent: 3431514 (1969-03-01), Oshman et al.
patent: 3586997 (1971-06-01), Kinsel
patent: 3713042 (1973-01-01), Kinsel
patent: 3921099 (1975-11-01), Abrams et al.
patent: 3965440 (1976-06-01), Graves
patent: 4314210 (1982-02-01), Everett

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