Fixing of a photorefractive grating in KTa(1-x)Nb(x)O(3) by cooling through the ferroelectric phase transition.
We report the fixing of a photorefractive grating in KTa(1-x)Nb(x)O(3). The procedure involves the writing of a photorefractive grating in the cubic phase and the cooling of the sample under an applied field into the rhombohedral phase. We discuss possible mechanisms responsible for the effect.
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Leyva
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Agranat
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Yariv