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A physical model of the electro-optic effect is presented which is based on an extension of Bloembergen's anharmonic oscillator model for nonlinear optical processes. Expressions for the electro-optic coefficients of centrosymmetric and noncentrosymmetric crystals are derived and shown to be in good agreement with experiment. Miller's empirical relation between the linear and nonlinear susceptibilities is also explained for the electro-optic case.
Kurtz et al. (Sun,) studied this question.