Microwave Nonlinear Susceptibilities Due to Electronic and Ionic Anharmonicities in Acentric Crystals

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Abstract
A microwave nonlinear susceptibility analogous to the optical and electro-optical nonlinear susceptibilities is investigated in a number of acentric ferroelectric and semiconductor crystals. Contributions from ionic nonlinearities result in enormously larger nonlinear coefficients in some materials than any known for the optical or electro-optical effects. An interpretation is presented in terms of a relationship between the nonlinear coefficients and the electronic and ionic linear susceptibilities.