Abstract

We present a novel configuration for optical phase conjugation (OPC) based on +c-face incident geometry in a pentagon-shaped 0°-cut photorefractive BaTiO₃ crystal. By choosing the geometry such as the orientation between the pump beam (or beams) and the crystal’s c-axis, one phase-conjugate wave in self-pumped phase conjugation (SPPC) and two phase-conjugate waves in mutually pumped phase conjugation (MPPC) can be generated proficiently. In SPPC, a steady phase-conjugate output with a fast response time ~0.4 s is obtained when the incident beam is of intensity as low as 4 W/cm². The influences of position and angle on the temporal phase-conjugate response are investigated and a very fine structure (~128 1p/mm) in a phase-distorted image can also be recovered. In MPPC, two very steady phase-conjugate outputs of two incoherent beams can be created and are all remarkably insensitive to angular and lateral positional changes of the input beams. Two phase-distorted images are simultaneously phase conjugated and resolved in 8-micrometer features without cross talk.

© 2001 Optical Society of America