We demonstrate that the phase conjugation of a beam during nondegenerate four-wave mixing is accompanied by a spatial shift relative to the degenerate conjugate-beam location. Experiments with a photorefractive phase-conjugate mirror reveal that the phase-conjugate beam shifts have a nonmonotonic dependence on the probe’s detuning frequency and comprise both lateral displacements of up to 218 μm and angular tilts of up to 34 arc sec. An approximate theory based on spatial dispersion coefficients is in partial agreement with the experimental results.
© 1998 Optical Society of America
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.4420) Nonlinear optics : Nonlinear optics, transverse effects in
(190.5040) Nonlinear optics : Phase conjugation
(190.5330) Nonlinear optics : Photorefractive optics
Abdul-Azeez R. Al-Rashed, Bradley M. Jost, and Bahaa E. A. Saleh, "Spatial Shifts of the Conjugate Beam Generated by a Nondegenerate Photorefractive Phase-Conjugate Mirror," Appl. Opt. 37, 7821-7826 (1998)