Generation of Forward Phase-Conjugate Beam by Cu:KNSBN-Cat Type Self-Pumped Phase-Conjugator

Abstract

A forward phase-conjugate beam was generated using a copper-doped (K0.5Na0.5)0.2(Sr0.61Ba0.39)0.9Nb2O6 (Cu:KNSBN) crystal with Cat type self-pumped phase-conjugator incident geometry. This Cat self-pumped phase-conjugator was formed simply with a small incident beam diameter of 0.4 mm at an incidence angle of 30°. In this configuration, the forward phase-conjugate beam could be generated at the same time with the self-pumped phase-conjugate beam. Furthermore, it was possible to generate the forward phase-conjugate beam while maintaining the high reflectivity of the self-pumped phase-conjugate beam. A forward phase-conjugate reflectivity of 0.9% was achieved at a self-pumped phase-conjugate reflectivity of 12%.