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18 June 2004 Applications of photorefractive liquid crystals
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In this paper we present experimental results of study of liquid crystal panels (LCP) designed for dynamic holography, with new photoconducting and photorefractive elements as their parts. We used either microcrystals or photochromic molecules which were added to the liquid crystal mixture, alternatively photoaligning polymers or polyvinyl carbazole doped with trinitroflourenone (PVK:TNF) and polyoctylthiophene as photoconducting layers were employed. Studies of light diffraction efficiency (η) were made in a typical degenerate two-wave mixing experiments (DTWM). We report here results of maximum diffraction efficiencies obtained for different type of LCPs. The highest η was measured in LCP with PVK:TNF layer (η=32%) and the lowest were reported for LCP containing microcrystals (η=0.01%). Best of developed LCPs were used as media for dynamic holographic applications. Elimination of phase distortion in degenerate four-wave mixing (DFWM) experiment, reconstruction of binary holograms and optical correlation are only few representative examples of applications demonstrated recently in our laboratory.
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Stanislaw Bartkiewicz, Jaroslaw Mysliwiec, and Andrzej Miniewicz "Applications of photorefractive liquid crystals", Proc. SPIE 5351, Organic Photonic Materials and Devices VI, (18 June 2004);

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