Method of and apparatus for measuring optical frequency variatio

Details Method of and apparatus for measuring optical frequency variatio Method of and apparatus for measuring optical frequency variatio

1980-12-01

1984-05-29

Sikes, William L.

Coherent light generators

Particular beam control device

Optical output stabilization

372 27, 372 29, 350394, 350393, 350385, H01S 313

Patent

active

044519230

ABSTRACT:
Herein is disclosed a method of and apparatus for measuring optical frequency variations wherein linearly-polarized incident light generated by a tunable laser or the like is delivered to a passive resonant cavity incorporating a linear polarizer such as a Brewster plate so that the reflected light acquires a frequency-dependent elliptical polarization which can be detected by a simple polarization analyzer providing a signal correlated with the frequency variation of the laser. Such signal can be utilized as a feedback error signal to stabilize the laser frequency, or to adjust the cavity resonance. If the cavity is tunable, tuning thereof will in turn provide a precision method for tuning of the laser itself.

REFERENCES:
patent: 3594659 (1971-07-01), Brandli
"Frequency Stabilization of Gas Lasers", by White, IEEE Jour. Quant. Elect., vol. QE-1, No. 8, Nov. 1965.

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