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We describe the steady-state enhancement of the phase-conjugate reflectivity that occurs with linear absorption near self-oscillation in four-wave mixing systems. Using a simplified general model, we show that this effect can arise in a variety of phase conjugators including those based on photorefractive and Kerr media. A new expression is introduced for the optimal reflectivity condition, which...
The optical field of unidirectional photorefractive ring resonators is described by a complex Ginzburg-Landau equation and, when limited to variations in a single transverse dimension, is described by an extended Kuramoto-Sivashinsky equation. Parameter dependences are examined and it is shown that complex time constants are necessary for spatiotemporal chaos.
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