An important physical phenomenon, quasinondestructive reading, has been observed for the first time in a photorefractive polymeric material, PMMA (poly-methylmethacrylate):DTNBI (1,3-dimethyl-2,2-tetramethylene-5-nitrobenzimidazoline):C₆₀. In addition, a maximum steady-state diffraction efficiency of 7% (125 {μ}m sample thickness) and a net two-beam coupling gain of 16 cm^-1 are observed in this polymer. A two-trap-level model, in which the levels are populated sequentially, qualitatively mimics the intensity-dependent decay rate and the transition to quasinondestructive reading.
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Silence et al. (1994) studied this question.
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