Topic
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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TL;DR: In this article, the photorefractive donor and acceptor densities of BaTiO3, crysta1s are derived from a thermodynamic point defect model, and the beam coupling gain and response time are calculated using the electron-hole model.
Abstract: We present a model which can be used to predict the effects of doping and oxidation-reduction treatment on the photorefractive behavior of BaTiO3, crysta1s.1 The densities of photorefractive centers are calculated from a thermodynamic point defect model. These centers may exist in multiple charge states; the occupation of each the temperature and oxygen partial pressure of processing and dopant concentration. The beam coupling gain and response time are calculated using the electron-hole model, where the photorefractive donor and acceptor densities are derived from the defect model.
10 Oct 2013
TL;DR: In this article, the photorefractive properties of 0.88Pb(Zn1/3Nb2/3)O3-0.12PbTiO3 single crystal were investigated by the two-wave coupling experiment.
Abstract: Photorefractive properties of 0.88Pb(Zn1/3Nb2/3)O3-0.12PbTiO3 single crystal were investigated by the two-wave coupling experiment. The maximal gain coefficient is 5.5cm-1, the effective trap density is 1.21 × 1016cm-3, and the normalized photorefractive response time under 1W/cm2 illumination is 1.48s at the wavelength of He-Ne laser. The dominant charge carrier was identified as electron from the direction of two-wave coupling energy transfer.
15 Oct 2004
TL;DR: In this article, the effect of micro-domains in polymer films on the photorefractive effect was investigated using a four-wave mixing experiment and it was shown that micro-domain structures in the polymers with the hydrogen-bonding moieties were more effective than those without them.
Abstract: The effect of the introduction of micro-domains in polymer films on the photorefractive effect was investigated. The photorefractivity of side-chain liquid crystalline polymers that possess a hydrogen-bonding moiety was examined using a four-wave mixing experiment. The photorefractivity was compared to that of a polymer which has no hydrogen-bonding moiety. A significant difference was found in the photorefractivity between hydrogen-bonding polymers and non-hydrogen-bonding polymers. This difference was likely due to the presence of micro-domain structures in the polymers with the hydrogen-bonding moieties.
25 Jul 1994
TL;DR: In this paper, the role of vanadium in the photorefractive process of CdTe:V was investigated and optical absorption, photoluminescence, and electron paramagnetic resonance were reported.
Abstract: Cadmium telluride has been regarded as a material of choice for many envisioned photorefractive applications in the infrared because of its high electrooptic coefficient. We recently demonstrated high beam-coupling gains in CdTe:V using applied electric fields. The prospects of using this gain enhancement mechanism in self-pumped phase conjugators and the experimental demonstration of the theoretically predicted high sensitivity of the photorefractive process in CdTe:V has attracted more attention towards the development and the optimization of the photorefractive properties of this materia1. Experience has shown that vanadium is a proper dopant that results in both high resistivity and efficient photoconductive and photorefractive responses over a wide wavelength range in the infrared. Further development of this material requires an understanding of the role of V in the photorefractive process. We report on photorefractive characterization, optical absorption, photoluminescence and electron paramagnetic resonance of vanadium-doped CdTe. The results of these experiments outline the role of vanadium in the photorefractive process. >
TL;DR: The complexity of photorefractive polymers arises from multiple contributions to the photo-induced index grating as discussed by the authors, and it has been shown that gain enhancement can be achieved by eliminating the electron grating contribution and returning to hole gratings.
Abstract: The complexity of photorefractive polymers arises from multiple contributions to the photo-induced index grating. Analysis of the time dynamics of the two-beam coupling signal is used to extract information about the charge species responsible for the grating formation. It has been shown in a commonly used photorefractive polymer at moderate applied electric fields, the primary charge carriers (holes) establish an initial grating which, however, are followed by a subsequent competing grating (electrons) that decreases the two-beam coupling efficiency. We show by upon using higher applied bias fields, gain enhancement can be achieved by eliminating the electron grating contribution and returning to hole gratings only.