Photorefractive properties and self-pumped phase conjugation in a series of BaTiO3 crystals

This paper presents the experimental results of two-wave mixing and self-pu mped phase conjugation (SPPC) in barium titanate (BaTiO3) crystals doped wi th Rh or Ce. It has been shown that the main parameters of SPPC depend very strongly on the concentrations of dopants, the incident angles and the cry stal cut used. High gain in two-wave mixing corresponds to low phase-conjug ate reflectivity in all samples. It is impossible to maintain the highest r eflectivity and gain simultaneously, because the gain will definitely be li mited when we try to get the highest reflectivity, and vice versa. Some qua litative explanation of the experimental results is also given.