A series of photorefractive polymethacrylates, containing a Disperse Red type chromophore and carbazole as charge transport agent with various spacer lengths, was synthesized and characterized. The photorefractive effect of these materials was studied by four-wave mixing and two beam-coupling at 780 nm after sensitization with 1 wt% TNFM. We have found a gain coefficient of Γ = 140 cm−1 at an applied electric field of 60 V µm−1 and complete internal diffraction at an applied electric field of 52 V µm−1. For fully functionalized photorefractive polymers, these values rank among the highest reported up to date.
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Engels et al. (2002) studied this question.