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-9fluorenylidene)malononitrile (TNFM) led to a significant increase in the two-beam coupling gain coefficient, reaching a net value of ∼370 cm−1 at an electric field of 45 V/μm at 1% TNFM, and resulted in an improvement in photorefractive speed.
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Ostroverkhova et al. (2003) studied this question.
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