Abstract
We investigate the phase-conjugate fidelity of the image beam produced from a nonplanar object beam by means of degenerate four-wave mixing with two strong plane-wave pump beams. We represent the object wave by an angular superposition of plane-wave components and derive reflection coefficients for each of the components. As the equations are linearized in the strong pump-beam case, the image wave can be found by a linear superposition of the reflected plane-wave components. The result of this analysis shows that in general perfect phase conjugation does not occur because of the unequal interaction length of each plane-wave component in the nonlinear material.
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