Anisotropic holographic light scattering has been discovered in centrosymmetric single crystals of sodiumnitroprusside, in which the photorefractive response is based on the excitation of metastable electronic states. Besides a bright homogeneous scattering corona generated by isotropic scattering, a sharp scattering ring builds up with light polarized orthogonal to that of the pump beam and the corona. This anisotropic scattering resulting from interference of scattered waves with the pump beam occurs although there is no linear electro-optic effect in centrosymmetric crystals.
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