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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17 Jun 2003
TL;DR: In this paper, two-wave and four-wave mixing experiments are performed on semiconductor with DX centers, CdF2:Ga,Y, and the experimental results reveal strong nonlinearity of this crystal and remarkable dynamic photorefractive effect at ambient temperature.
Abstract: Two-wave and four-wave mixing experiments are performed on semiconductor with DX centers, CdF2:Ga,Y. The crystal is known to exhibit strong modification of optical constants when exposed to light as a result of optically induced transformation of DX-centers. Our experimental results reveal strong ?(3) nonlinearity of this crystal and remarkable dynamic photorefractive effect at ambient temperature. With the z-scan technique we found that the 10 ?W green light beam induces the negative change of refractive index of 10-5. The diffraction efficiency reaches 50%. The grating decays in a few seconds at room temperature but the decay time decreases with temperature. The phase conjugate wave is generated with nearly 40% reflectivity, and the coherent oscillation is observed in semilinear cavity with two counter-propagating pump beams. Centro-symmetric and optically isotropic CdF2:Ga,Y is equivalent to or surpasses in some properties the well-known polar photorefractive crystals.
03 May 1998
TL;DR: A comparison between theory and experiment for high-intensity steady-state screening solitons shows that the excited free carrier densities are high and produce index variations that can no longer be neglected in the theoretical model.
Abstract: We report a comparison between theory and experiment for high-intensity steady-state screening solitons. Although the low-intensity feature of photorefractive spatial solitons is attractive for applications, high intensity photorefractive solitons are also interesting, because the speed with which the steady-state screening soliton forms is intensity dependent and can occur at nanosecond speeds or faster for GW/cm/sup 2/ intensities. For these intensities, however, the excited free carrier densities are high and produce index variations that can no longer be neglected in the theoretical model.
TL;DR: In this paper, the photorefractive nonlinearity possesses a big potential for manipulating light pulses, including their slowing down, long term storage and release on demand, and it is shown theoretically and experimentally that it possesses the potential to manipulate light pulses.
14 Sep 1998
TL;DR: In this paper, the authors report multiple weakly interactins in photorefractire oscillator with sathrablc absorber where the gain element and saturable absorber were placed in Foumer-conjugate planer such configuration leads to strong tompetition between localised structures.
Abstract: Transverse pattern formation in optical systems becomes attractive due to potential applications for Qaltem recopition and optical information processing Recently the idea of bistable spatially localized %tmcmres (LS) started 10 be considered for oarallel infomation processing Localised stmctuies were predicted theoretically [ I ] and realised in lasers with sathrablc absorber [Z] where the gain element and saturable absorber were placed in Foumer-conjugate planer Such configuration leads to strong tompetition between localised structures.thus only one soliton-like beam can be excited. We report multiple weakly interactins l.S's in photorefractire oscillator u i th saturable absorber
07 May 2000
TL;DR: In this article, the authors report on the fabrication of photorefractive InGaAs-GaAs MQW and its performance at the wavelength of 1064 nm and its applications to proposed measurement systems.
Abstract: Summary form only given.Summary from only given. Photorefractive multiple quantum wells (MQWs) have been applied to the ultrasound detection, the depth-resolved image recognition through turbid media, and so on. The fabrication of photorefractive MQW devices at 1064 nm and its applications to proposed measurement systems are very attractive and interesting. Furthermore, the realization of these devices may create the new area of applications of photorefractive MQWs. Here, we report on the fabrication of photorefractive InGaAs-GaAs MQWs and its performance at the wavelength of 1064 nm.