Self-pumped phase conjugation in rhodium-doped BaTiO_3 with 106-µm nanosecond pulses

Efficient internal-loop self-pumped phase conjugation is demonstrated in a photorefractive rhodium-doped barium titanate crystal by repetitively pulsed nanosecond pulses from a Q-switched Nd:YAG laser operating at 1.06 microm . Phase-conjugate reflectivities as high as 32% are obtained with a response time of ~5 min at a repetition rate of 30 Hz. The ability of the phase conjugator to correct severe phase distortions is also demonstrated.