PROCESS AND DEVICE FOR THE GENERATION OF A SINGLE-FREQUENCY LIGHT RAY

摘要

A method of generating a single frequency laser light ray comprising: frequency modulating two oscillating modes or self-oscillations of a laser oscillator at a modulation frequency which approximates the frequency distance of adjacent modes; orthogonally polarizing these rays and passing them through an optically non-linear, birefringeant element the optical axis of which is inclined to their path at such an angle as to produce a maximum interaction therebetween. Due to the maximum non-linear interaction an unmodulated, single frequency output ray is obtained the frequency of which equals the sum of the carrier frequencies of respective rays.