Observation of Self-pumped Phase Conjugation for Two Mutually Coherent Input Beams in a KNSBN Crystal

Two coherent or incoherent stable self-pumped phase conjugations have been obtained simultaneously in a Ce-doped (K_0.5Na_0.5)_2y (Sr_0.61 Ba_0.39)_1-y Nb₂O₆(KNSBN) crystal by using two mutually coherent input beams from a He-Ne laser, and energy translation from one beam to another induces self-pumped phase conjugative reflectivity of one beam above 100%.