Efficient induced mutual pumped phase conjugation in Cu:KNSBN

Abstract

ABSTRACTThe mutually pumped phase conjugate reflection induced by a sell-pumped phase conjugate reflection of anothermutually coherent beam has been demonstrated in a photorefractive Cu-doped KNSBN crystal. The dependence of the mutually pumped phase conjugate reflectivity on the intensity ratio of the two incident beams and on the incident position ofthe signal beam was measured. We obtain phase conjugate reflectivities of greater than 90% at 488nm. 1. INTRODUCTIONSince its discovery, optical phase conjugation has been studied in great detail for various nonlinear phenomena andtechniques. Both self-pumped phase conjugate reflection (SPPCR) and mutually pumped phase conjugate reflec-tion(MPPCR)35 have been the candidates for applications to generate a phase conjugate replica of an incident beam. They have been researched extensively in photorefractive crystals such as BaTiO3 and SBN, and the SPPCR in barium strontiumpotassium sodium niobate (KNSBN)6 crystals. Recent experiments have also shown that the SPPCR may appear due to the