A new geometry for third-order nonlinear, noncollinear difference-frequency generation is presented and experimentally verified. It is shown to be equal to a polychromatic phase conjugation. The coupled-wave equations are solved for steady-state cw pumping and for transient pumping without reconjugation. Applications to image processing and to tunable generation of coherent light are discussed.
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Göran Manneberg (1986) studied this question.
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