Abstract
The photorefractive effect has been observed and documented for decades1,2. This effect is typically observed in impurity doped electrooptic crystals. When the crystal is illuminated, charge carriers are excited from occupied donor states to the conduction band. These excited charge carriers migrate under the influence of diffusion, and any internal or external electric fields, until they are trapped by empty donors thereby causing a space-charge field to be formed within the crystal. The electric field that results from the charge separation acts to modulate the index of refraction through the electrooptic Pockels effect.
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Guenther, B.D., Wood, M.V., Khoo, I.C. (1998). Photorefractivity and Optical Wave Mixing Effects in Nematic Liquid Crystals Doped with Fullerene Derivatives and Dyes. In: Prasad, P.N., Mark, J.E., Kandil, S.H., Kafafi, Z.H. (eds) Science and Technology of Polymers and Advanced Materials. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0112-5_20
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DOI: https://doi.org/10.1007/978-1-4899-0112-5_20
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