Abstract

Recently, three new double phase-conjugate mirrors¹ using barium titanate have been reported. These mirrors involve two mutually incoherent laser beams which are independently directed into a passive photorefractive crystal. There they interact and cause the phase conjugate of each beam to form. We report on another configuration which is particularly suited for strontium barium niobate. This new configuration utilizes two extraordinary polarized laser beams entering the crystal from opposing faces along a common plane of incidence containing the c axis. The two opposing faces are parallel to the c axis. For certain incident angles, the laser beams which cross in the crystal bridge together forming a single beam which runs nearly perpendicular to the c axis. Shortly afterward, the phase-conjugate beams appear. This effect occurs for incident beam angles of +10 to +65° (where a beam at +90° points in the positive c-axis direction).

© 1988 Optical Society of America