The nonlinear coefficient d31 of K.6Li.4NbO3 is equal to d31 of LiNbO3. Also, the serious problem of optically induced refractive-index inhomogeneities which has been observed in many nonlinear materials, notably LiNbO3, is not observed in this new material. The electro-optic half-wave voltage of this new material is 930 V.
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Uitert et al. (1967) studied this question.
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