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Fixing of photorefractive volume holograms in K1−yLiyTa1−xO3

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Abstract

We report the fixing of photorefractive holographic gratings with high efficiency in a sample of K1−yLiyTa1−xNbxO3 doped with Cu, V, and Ti. Holograms are thermally fixed through the screening of a photorefractive space-charge field by a nonphotoactive species at elevated temperatures. Fixed holograms are revealed by illumination at lower temperatures. Diffraction efficiencies of 25% in a 0.54-cm-thick sample are measured. Holograms undergo thermal decay with a 0.67-eV activation energy.

© 1995 Optical Society of America

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