ORIGIN AND ELIMINATION OF DYNAMIC INSTABILITY IN A SELF-PUMPED PHASE-CONJUGATE MIRROR

The origin and the elimination of dynamic instability have been experi mentally studied in a self-pumped phase-conjugate mirror (SPPCM) of a Cu:KNSBN crystal. Experimental results show that the dynamic instabili ty of the SPPCM arises from the competition between the self-generated fanning effect and SPPCM formation. The ordinary-polarized component of a partially extraordinary-polarized incident light beam can act to decrease the self-generated fanning effect of the photorefractive crys tal. We can eliminate the dynamic instability of the SPPCM by restrain ing the self-generated fanning effect with a partially extraordinary-p olarized incident Light beam.