Theory of electrooptic effect in BaTiO3

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Abstract
The mechanism of electrooptic effect in BaTiO3 is discussed taking account of the dipole interaction among the constituent ions and their electronic polarizabilities. Three contributions are considered, namely; the first is caused by modified Lorentz correction for the dipole interaction, whose ratio to the whole contribution is estimated as 0.19; the second is due to the change of electronic polarizabilities due to the piezoelectric deformation, whose ratio is estimated as 0.81-(εclamp/εfree); the third contribution is related to the spontaneous Kerr effect, whose ratio is regarded as εclamp/εfree.