In electro-optic crystals the dependence of directions of refracted waves and rays on the instantaneous strength of the modulating field may change the following parameters: polarization azimuths, distances covered by the divergent fast and slow waves, refractive indices, effective electro-optic coefficients, and also the extent of overlap of the partially interfering light beams. Despite the fact that in noncentrosymmetric crystals the changes may be due to the linear electro-optic effect, the dependences, when appearing simultaneously, for some directions of the light and modulating field can result in a complex indirect modulation observed on higher harmonics of the electric field. Taking as an example the LiNbO3 crystal, the indirect modulation on the second harmonic is investigated employing the Jones matrix calculus.
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Izdebski et al. (2005) studied this question.
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