Phase conjugation of BaTiO3:Ce by backward stimulated photorefractive scattering

We present a self-pumped phase conjugator (SPPC) based on backward stimulated photorefractive scattering in a BaTiO3:Ce crystal in air without any external seed beam. Stable reflectivities of as much as 70% and good phase conjugate fidelity have been demonstrated in the 0°-cut crystals. Over 50% reflectivities at 515 nm have been obtained at an incident angle between 20° and 70°. In comparison with undoped 0°-cut and 45°-cut crystals, the buildup time of SPPC is much faster for the same intensity.