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Tunable radiation in the 0.43–0.52-μm spectral region was produced by frequency doubling a tunable dye laser in ZnSe. At wavelengths shorter than the band gap of ZnSe (λ<0.46 μm), second-harmonic power was limited by crystal absorption, whereas for longer wavelengths the second-harmonic power was as much as 1500 times larger than that predicted for a single-domain crystal. This enhancement is predicted by a simple theory which accounts for the favorable nonlinear optical effects of rotational twins and crystal defects.
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Hocker et al. (1976) studied this question.
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