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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

,
 and *
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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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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