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 paper, the photorefractive properties of mixtures of a ferroelectric liquid crystal and a photoconductive polymer were investigated by two-beam coupling experiments, and the effect of reorientation of spontaneous polarization vector was induced in these mixtures.
Abstract: The photorefractive properties of mixtures of a ferroelectric liquid crystal and a photoconductive polymer were investigated by two-beam coupling experiments. A photorefractive effect based on reorientation of spontaneous polarization vector was induced in these mixtures. Asymmetric energy exchange was observed, and gain coefficients of 20−50 cm-1 were obtained. The dependences of the gain coefficient on temperature and external electric field were examined.
8 citations
TL;DR: In this article, the effect of synchrotron light on the refractive index of poly(methyl methacrylate) (PMMA) has been investigated and shown to allow the manufacturing of waveguides in PMMA.
Abstract: Synchrotron light changes the refractive index of poly(methyl methacrylate) (PMMA). Refractive-index enhancements as well as reductions depending on dose and energy of the radiation used can be observed. This effect allows the manufacturing of, for example integrated-optical components, as is demonstrated by realization of waveguides in PMMA.
8 citations
TL;DR: In this paper, the photorefractive recording dynamics of two-beam coupling in semi-insulating semiconductors by beams with slightly different frequencies are studied theoretically and experimentally.
Abstract: The photorefractive recording dynamics of two-beam coupling in semi-insulating semiconductors by beams with slightly different frequencies are studied theoretically and experimentally. The influences of bulk absorption, Gaussian beam profiles, and experimental geometry on the temporal response are analyzed. These effects act to narrow the bandwidth. Measurement of the material photorefractive time constant is discussed.
7 citations
TL;DR: In this article, the authors reported on the holographic recording on photorefractive Bi2TeO5 crystals using λ=633 nm wavelength light and found out the presence of a fast and a slow hologram, both of which exhibited rather high diffraction efficiencies.
Abstract: We report on the holographic recording on photorefractive Bi2TeO5 crystals using λ=633 nm wavelength light. We studied the behavior of this material under the action of this low photonic energy light and found out the presence of a fast and a slow hologram, both of photorefractive nature and exhibiting rather high diffraction efficiencies. The faster and the slower holograms are based on the excitation and diffusion of oppositely charged carriers (likely electrons and holes). Relevant parameters for the photoactive centers responsible for both kind of holograms were characterized using purely holographic techniques. No evidences of non-photosensitive ionic charge carriers being involved in the recording process at room temperature nor self-fixing effects were found.
7 citations
TL;DR: In this paper, the photorefractive properties of KNbO3 were improved by electrochemical reduction, such as photoconductivity, beam coupling gain and response time, and anisotropic self-diffraction was used to obtain a resolution of up to 10 linepairs per mm.
Abstract: With the electro-chemical reduction method developed recently we are able to improve the photorefractive properties of KNbO3 such as photoconductivity, beam coupling gain and response time. The preparation of large monodomain crystals with good optical and photorefractive homogeneity for photorefractive incoherent optical conversion (PICOC) is described. The image conversion was achieved by the anisotropic self-diffraction technique. The optimal crystal configuration for this application was verified experimentally. A resolution of up to 10 linepairs per mm was achieved for modulating a laser beam by a white light image.
7 citations