Abstract
The highest diffraction efficiency(DE) value after illumination and post-curing of photopolymer films were obtained at the <TEX>$SeO_2$</TEX>/Acrylamide(AA) Ratios of AA 3.0 g, <TEX>$SeO_2$</TEX> 1.0g and the DE's were stable values of over 90%. By the addition of <TEX>$SeO_2$</TEX>, the maximum DE at the initial stage of illumination was reached at 300 seconds, which suggests <TEX>$SeO_2$</TEX> slows down the photopolymerization of AA, which enhances the maximum DE value by giving more migration time. DE variation curve for the optimum composition during extended-time illumination of 9,000 seconds resembles a sine curve due to the combination of the monomer diffusion and the photopolymerization, and the photopolymer film expanded by about 8% after photopolymerization due to monomer migration.
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