Abstract
ABSTRACT We present an organic photorefractive material based on a low molar mass glass with both photoconductive and nonlinear optical properties. By implementing a novel plasticizer and doping with the well known sensitizer C60 weobtained a composite material, which shows extremely fast initial response times of 2.5 ms at writing beam intensitiesof 'write 1 W/cm2 and 450 is at 'write 10.8 W/cm2. Combined with high refractive index modulations of up toLrt = 6 . iO and sample lifetimes of over 6 months this material exhibits an excellent overall performance.In comparison to another similar composite system which was plasticized by a more polar dopand, we demonstratethe crucial role of this functionality in the dispersivity of charge transport and the photorefractive grating dynamics. The complicated temporal behavior of grating build-up and decay which was investigated by degenerate four-wavemixing experiments is discussed in detail. We propose a new way to describe these processes in a more generalmanner as it is done up to date, using an inverse Laplace transform (ILT) analysis.Keywords: photorefractive glass, photoconductivity, time-of-flight, response time, dispersive charge transport,
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