<title>Build-up dynamics of fast organic photorefractive glasses</title>

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 C<SUB>60</SUB> we obtained a composite material, which shows extremely fast initial response times of 2.5 ms at writing beam intensities of I<SUB>write</SUB> equals 1 W/cm<SUP>2</SUP> and 450 microsecond(s) at I<SUB>write</SUB> equals 10.8 W/cm<SUP>2</SUP>. Combined with high refractive index modulations of up to (Delta) n equals 6 X 10<SUP>-3</SUP> and sample lifetimes of over 6 months this material exhibits an excellent overall performance.