Abstract
We report the results of experimental investigations of the mechanism transformation from four-wave mixing and stimulated photorefractive backscattering to four-wave mixing and total internal reflection during self-pumped phase conjugation in a photorefractive crystal by varying the plane of polarization of the input beam. The use of a mixed-polarization input beam can change the fanning pattern, which leads to the mechanism transformation and an enhancement of the phase-conjugation reflectivity. The temporal dynamics of the buildup process indicate that such an enhancement is due to the presence of both types of mechanism during phase conjugation. In addition, we compare the contributions of 2k gratings with the phase conjugation during both mechanisms.
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