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Organic photorefractive materials

About: Organic photorefractive materials is a research topic. Over the lifetime, 697 publications have been published within this topic receiving 13041 citations.


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Journal ArticleDOI
TL;DR: In this paper, a new type of optical nonlinearity based on the properties of the DX center in doped compound semiconductors is proposed and demonstrated, which exhibits a refractive index change 30 times larger than that of conventional photorefractive materials.
Abstract: We propose and demonstrate a new type of optical nonlinearity based on the properties of the DX center in doped compound semiconductors. We report measurements on samples of AlGaAs:Si which were exposed to interfering laser beams and find diffraction from a large, persistent refractive index change associated with the well‐known persistent photoconductivity effect in this material. The new effect is shown to exhibit a refractive index change 30 times larger than that of conventional photorefractive materials. We explain the origin of the refractive index change in terms of the plasma effect and show that its expected magnitude is consistent with our observations.

65 citations

Journal ArticleDOI
TL;DR: In this paper, a simple frequency-dependent ellipsometric technique for measuring the birefringence, the Pockels and Kerr properties of low glass transition temperature photorefractive polymers is proposed.
Abstract: A simple frequency‐dependent ellipsometric technique for measuring the birefringence, the Pockels and Kerr properties of low glass‐transition temperature photorefractive polymers is proposed. The technique is applied to the characterization of highly efficient DMNPAA:PVK:ECZ:TNF photorefractive polymers and the determination of the microscopic properties of the DMNPAA molecule.

60 citations

Journal Article
TL;DR: In this article, the authors reviewed recent developments involving the nonlinear interactions of light in photorefractive crystals, including the mutual light-crystal interactions which govern their operation, and all-optical applications based on these oscillators.
Abstract: Recent developments, both theoretical and experimental, involving the nonlinear interactions of light in photorefractive crystals are reviewed. When pumped by light beams in various configurations, certain crystals, such as barium titanate (BaTiO/sub 3/), respond with the self-build up of gratings in the crystal and formation of new light beams. The emphasis here is on these devices, known as photorefractive oscillators, the mutual light-crystal interactions which govern their operation, and all-optical applications which are based on these oscillators. >

60 citations

Journal ArticleDOI
TL;DR: In this paper, the photorefractive properties of congruent lithium niobate crystals codoped with HfO2 and Fe2O3 were investigated and it was found that Fe ions are still located at Li sites as photore-fractive centers when the doping concentration of Hf O2 goes above the threshold value.
Abstract: Photorefractive properties of congruent lithium niobate crystals codoped with HfO2 and Fe2O3 were investigated and it was found that Fe ions are still located at Li sites as photorefractive centers when the doping concentration of HfO2 goes above the threshold value. As a result, their photorefractive response speed and sensitivity are significantly enhanced. Meanwhile, the high saturation diffraction efficiency is still maintained. Experimental results definitely show that Hf is now the most effective doping element for LiNbO3:Fe crystal to improve its photorefractive properties.

60 citations

Journal ArticleDOI
TL;DR: A review of the field of photorefractive liquid crystals is presented in this article, where composites based on high-molar-mass liquid crystals are now capable of forming volume (Bragg) gratings with high photore-fractive gain coefficients of >600 cm−1.
Abstract: ▪ Abstract A review of the field of photorefractive liquid crystals is presented. The first reports of photorefractive liquid crystals occurred in 1994, and the performance of these materials has dramatically improved since that time. Liquid crystalline materials have proven to be highly versatile, showing photorefractive character under a wide range of conditions. For example, new composites based on high-molar-mass liquid crystals are now capable of forming volume (Bragg) gratings with high photorefractive gain coefficients of >600 cm−1. Formation times for photorefractive Bragg gratings of 15 ms with applied fields of only 0.1 V/μm have been reported. Low-molar-mass liquid crystals continue to be developed and show their largest photorefractive character in the thin (Raman-Nath) grating regime. Composites of nonmesogenic polymers and liquid crystals are also discussed. The experiments and theoretical work that have been used to characterize these materials are reviewed.

59 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231
20211
20201
20181
20172
20165