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We present an analytical description of the degenerate multiwave diffraction of an independent probe beam incident at an arbitrary angle upon a population grating created by two resonant and coherent pump beams in a saturable absorbing medium. We have also undertaken experimental verification of some of the features, using a thin-film sample of Rhodamine 6G-doped boric acid glass. It is found that the three-beam configuration provides a broader angular bandwidth for observing nonlinear effects.
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Rao et al. (1995) studied this question.
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