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Definition of "photorefractive crystal" |
crystalline solids that exhibit photorefractive effect. The photorefractive effect is observed in many electro-optic crystals, including BaTiO3, KNbO3, LiNbO3, Sr1−xBaxxNb2O6 (SBN), Ba2−xSrxK1−yNay Nb5O15 (KNSBN), Bi12SiO20 (BSO), Bi12GeO20 (BGO), GaAs,InP, CdTe, etc. These crystals are referred to as photorefractive crystals. They are by far the most efficient medium for the generation of phase conjugation and real-time holography using relatively lowintensity levels (e.g., 1 W/cm²). In addition to the efficient holographic response, beam coupling known as two-wave mixing also occurs naturally in photorefractive crystals. |
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