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4 May 2012 Investigations of photosensitizers in an AA/PVA-based photopolymer material
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Several studies of the time varying photon absorption effects, which occur during the photo-initiation process in photopolymer materials, have been presented. Three primary mechanisms have been identified: (i) the dye absorption, (ii) recovery, and (iii) bleaching. Based on an analysis of these mechanisms, the production of primary radicals can be physically described and modelled. In free radical photo-polymerization systems, the excited dye molecules induce the production of the primary radicals, R, which is a key factor in determining how much monomer is polymerized. This, in turn, is closely related to the refractive index modulation formed during holographic recording. In this article, we overcome the complexicy of estimating the rate constant of intersystem crossing, kst, in going from the excited singlet state dye to the excited triplet state dye, by introducing kaS and kaT into the model, which are the rate constant of photon absorption from ground state to singlet state and triplet state respectively.
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Yue Qi, Michael R. Gleeson, Jinxin Guo, and John T. Sheridan "Investigations of photosensitizers in an AA/PVA-based photopolymer material", Proc. SPIE 8429, Optical Modelling and Design II, 842921 (4 May 2012);

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