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Materials 2012, 5(5), 784-817; doi:10.3390/ma5050784
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Semiconductor CdF2:Ga and CdF2:In Crystals as Media for Real-Time Holography

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 and
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National Research University of Information Technologies, Mechanics and Optics, 49, Kronverkskiy pr., St. Petersburg 197101, Russia
* Author to whom correspondence should be addressed.
Received: 14 March 2012 / Revised: 24 April 2012 / Accepted: 25 April 2012 / Published: 7 May 2012
(This article belongs to the Special Issue Advanced Materials for Modern Holographic Applications)
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Abstract

Monocrystalline cadmium fluoride is a dielectric solid that can be converted into a semiconductor by doping with donor impurities and subsequent heating in the reduction atmosphere. For two donor elements, Ga and In, the donor (“shallow”) state is a metastable one separated from the ground (“deep”) state by a barrier. Photoinduced deep-to-shallow state transition underlies the photochromism of CdF2:Ga and CdF2:In. Real-time phase holograms are recorded in these crystals capable of following up optical processes in a wide frequency range. The features of photochromic transformations in CdF2:Ga and CdF2:In crystals as well as holographic characteristics of these media are discussed. Exemplary applications of CdF2-based holographic elements are given.
Keywords: cadmium fluoride; bistable centers; photoinduced metastable state; holographic grating decay; real-time holography; dynamic correction of wavefronts and optical images; holographic correlator cadmium fluoride; bistable centers; photoinduced metastable state; holographic grating decay; real-time holography; dynamic correction of wavefronts and optical images; holographic correlator
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Ryskin, A.I.; Shcheulin, A.S.; Angervaks, A.E. Semiconductor CdF2:Ga and CdF2:In Crystals as Media for Real-Time Holography. Materials 2012, 5, 784-817.

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