Parametric Oscillation in Photorefractive Crystals with Local Response in Unclosed Optical Cavities,
UKRAINIAN SSR ACADEMY OF SCIENCES KIEV
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Steady-state coherent oscillation in the ring-loop and double-side mirror geometries is first observed and studied in media with local nonlinear response. The results of calculation are presented stating that the oscillation becomes possible providing two necessary conditions are met the oscillation waves appear 1 misaligned with respect to strictly backward to pumps directions to restore the phase matching, and 2 they are shifted in frequency with respect to the pump waves. By appropriate choice of frequencies of two incident waves in double-side mirror geometry one of oscillating waves may be done a perfect conjugate replica of an input wave with limited spatial spectrum.