Sensitization of photopolymer materials by halogenated derivatives of xanthene and thioxanthene dyes in the pulsed recording mode

Abstract

A holographic photopolymer material based on a poly(vinyl alcohol) matrix, the acrylamide monomer, and triethanolamine as an initiator was sensitized by the xanthene dyes erythrosine; thioeryth-rosine; eosin; thioeosin; thiofluorescein, 4-iodo-, 4,5-diiodo-, and 2,4,5-triiodofluorescein; and 4-bromo-, 4,5-dibromo-, and 2,4,5-tribromothiofluorescein. The quantum yields of photobleaching of these dyes in the polymer matrix were determined. Transmission phase gratings were recorded in the pulse mode (λ = 532 nm, tp = 10 ns). The levels of the diffraction efficiency of holograms were measured, and the 4-bromo- or 4,5-dibromothiofluorescein-triethanolamine system was found to be the most effective photoinitiator.