Clamped–unclamped electro-optic coefficient dilemma in photorefractive phenomena

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Abstract
In a usual photorefractive experiment neither the unclamped nor the clamped linear electro-optic coefficients should be used for calculating the refractive-index change. We show that a crystal deformation in a form of a static plane wave is produced by the space-charge electric-field grating. The total refractive-index change is then calculated by adding together the strain-free electro-optic contribution and the elasto-optic contribution, properly taking into account also the rotation of the axes of the optical indicatrix that is produced by shear deformations. This roto-optic contribution to the photorefractive effect has been overlooked until now.

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