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Elimination of Dynamic Instabilities in the +c-face Incident Photorefractive BaTiO3 Mutually Pumped Phase Conjugator

Experimental observations of the dynamic instabilities in the +c-face incident mutually pumped phase conjugator (MPPC) of a BaTiO3 crystal are reported for the first time. Experiments show that it is possible to stabilize the phase-conjugate output by choosing a proper geometry formed from the crystal and two incident beams. By choosing the proper geometry the essential configuration of the MPPC attained is a “kite” rather than a “fish head”. Data also indicate that the phase-conjugate output can reach a very steady state with a high value (∼32%) and is insensitive to angular and positional variations.