Coordinated theoretical and experimental investigations were made of the conditions for achieving high energy exchange in three-wave parametric interaction of temporally and spatially modulated picosecond light packets. An efficiency of 50% was achieved for conversion of pump energy into radiation with continuously tunable wavelengths under optimal conditions in a KDP crystal. In this case, a spatial pump-radiation profile without random amplitude-phase distortions was an extremely important factor.
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Kabelka et al. (1979) studied this question.
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