TEMPORAL INSTABILITIES IN AN EXTERNALLY DRIVEN RING PHASE CONJUGATOR
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A ring self-pumped phase-conjugator mirror with an injected signal and an applied externalelectric field was studied in an experiment with a photorefractive strontium barium niobate crystal. Competition between the injected signal and free oscillation caused temporal instabilities in theoutput beam. Periodic and erratic pulsations of output intensity were observed as a function of theinjected beam intensity and electric field strength. Numerical simulations of the theoretical modelof this system confirmed the existence of the regime of unstable behavior. 1991 Optical Society of America.