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Resonantly enhanced surface second-harmonic generation and sum-frequency generation have been demonstrated on Rhodamine 6G-coated glass substrates using a noncollinear excitation geometry. This geometry yields an output beam that is spatially separated from the input beams. The relative efficiency of nonlinear generation as a function of the angular dependence and spatial overlap of the input beams is calculated and compared with experiment.
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Muenchausen et al. (1987) studied this question.
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