Holographic Storage in Quadratic PLZT Ceramics

With 31 FiguresThe light-induced changes of refractive indices in electro-optic crystals are based on the spatial modulation of photocurrents by nonuniform illumination. The generation of photocurrents at low light intensity depends on the presence of suitable donors, because most of the crystals of interest are intrinsically transparent in the visible. The electrons or holes, which are excited from the impurity centers by light of a suitable wavelength, are upon migration, retrapped at other locations, leaving behind positive or negative charges of ionized trap centers. The photoexcited charges will be reexcited and retrapped until they finally drift out of the illuminated region and are trapped. The resulting spacecharge field between the ionized donor centers and the trapped charges modulates the refractive indices via the electro-optic effect. Uniform illumination erases the space-charge fields and brings the crystal back to its original state (which process is known as optical erasure).

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Holographic Storage in Quadratic PLZT Ceramics

Abstract: material B. The trace of the crack front in vitreous carbon (material A) is compared with that of soda-lime glass in Fig. 5 ( C ) . The trailing part of the crack front approaches the grooved side of the. specimen much more slowly in vitreous carbon than in soda-lime glass.

Cited by 17 publications

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ChemInform Abstract: HALOGRAPHIC STORAGE IN QUADRATIC PLZT CERAMICS

ChemInform Abstract: HALOGRAPHIC STORAGE IN QUADRATIC PLZT CERAMICS

Ferroelectric crystals

Photorefractive effects and materials

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