The effect of partial spatiotemporal coherence in photorefractive two-beam coupling is studied theoretically and experimentally. Coupled-wave equations and a beam-propagation method are used to study the influence of coupling on the statistical properties of the beams. The spatial coherence is found to improve for amplified and to deteriorate for deamplified beams. A two-beam coupling experiment with light of reduced spatial coherence was performed with photorefractive barium titanate. Qualitative agreement between theory and experiment was obtained.
© 1992 Optical Society of America
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