Among the nonlinear optical (NLO) materials, second harmonic generators are important because of their applications in extending the limited frequencies available from lasers. A theory is presented that makes it possible to design and synthesize new NLO materials according to need, based on an understanding of the structure–property relationships. Four inorganic NLO crystals serve as an illustration of the success of this method.
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Xia et al. (1995) studied this question.
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