High-performance photorefractive organic glass with near-infrared sensitivity

A high-performance organic glass mixture comprised of two dicyanomethylenedihydrofuran derivatives is presented. A pronounced two-beam coupling effect was observed at a wavelength of 830 nm in an unsensitized composition. Sensitization with (2,4,7-trinitro-9-fluorenylidene)malononitrile (TNFM) led to a significant increase in the two-beam coupling gain coefficient, reaching a net value of similar to370 cm(-1) at an electric field of 45 V/mum m at 1% TNFM, and resulted in an improvement in photorefractive speed. (C) 2003 American Institute of Physics.