The photorefractive effect studied by nondegenerate optical phase conjugation: theoretical and experimental aspects

Mark Cronin‐Golomb, Baruch Fischer, Jeffrey Owen White +1 more

Q. Byron He, Joseph Shamir, H. John Caulfield +1 more

Abdul-Azeez R. Al-Rashed, Bradley M. Jost, Bahaa E. A. Saleh

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 mum 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.

Amnon Yariv, Mark Cronin‐Golomb

Cailong Bao, Jingjiang Zhang, Shuying Wang

This paper demonstrates dual-frequency phase conjugation waves via the high-order nonlinear effect by nondegenerate six-wave mixing in iron-doped lithium niobate. In the experiment, two conjugation waves of different frequency are generated. Conjugation wave 1 is similar to nondegenerate four-wave mixing; conjugation wave 2 is completely different. The experiments measure the relationships between two conjugation wave intensities and parameters, respectively, and compare the differences of the two conjugation waves. To explain the experimental results, we assume that there is a fifth-order nonlinear interaction in crystal, and we believe the two conjugation waves are generated via different level nonlinear interactions. The theory agrees with the experimental results.

Mark Cronin‐Golomb, Amnon Yariv