Phase conjugator with two coherent beams in a BaTiO3 : Ce crystal

A phase conjugator which includes two coherent beams that are incident upon one of a-faces of a BaTiO3:Ce crystal without internal reflection is perfo rmed experimentally. Based on the four-wave mixing, the mechanism of this c onjugator is investigated numerically. In comparison with the corresponding self-pumped phase conjugator, the phase-conjugate behavior of this conjuga tor is established much more quickly, its phase conjugate reflectivity is g reater in some cases and the intensity threshold is lower by over two order s of magnitude. The configuration of this conjugator is easy to perform bec ause the output response exists over a wide range of angular and lateral po sitions of the two incident beams on the crystal.