The physical origin of frequency shift and dynamic instability in a photorefractive self-pumped phase conjugator is analyzed by use of four-wave mixing and multi-four-wave mixing. We show that the frequency shift and the instability result from the requirement of the maximal energy transfer between the interacting beams. Two examples of numerical results in a cat self-pumped phase conjugator are given, which are in good agreement with previous experimental results. A simple method is proposed to change an unstable phase-conjugate output to a stable one.
© 2000 Optical Society of America
(190.0190) Nonlinear optics : Nonlinear optics
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(190.3100) Nonlinear optics : Instabilities and chaos
(190.5040) Nonlinear optics : Phase conjugation
(190.5330) Nonlinear optics : Photorefractive optics
Ping Xie, Peng-Ye Wang, and Jian-Hua Dai, "Origin of frequency shift and temporal instability in photorefractive self-pumped phase conjugators," J. Opt. Soc. Am. B 17, 1182-1187 (2000)