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1.3 PHYSICAL SCIENCES, Condensed matter physics, Optics, Polymer science
An acrylamide-based photopolymer formulated in the Centre for Industrial and Engineering Optics has been investigated with a view to further optimisation for holographic optical storage. Series of 18 to 30 gratings were angularly multiplexed in a volume of photopolymer layer at a spatial frequency of 1500 lines/mm. Since the photopolymer is a saturable material, an exposure scheduling method was used to exploit the entire dynamic range of the material and allow equal strength holographic gratings to be recorded. This investigation yielded the photopolymer M/# for moderately thin layers. Photopolymer temporal stability was also studied by measuring variations of material shrinkage, Bragg selectivity curve, and diffraction efficiency.
Sherif, H., Naydenova, I., Martin, S., McGinn, C., Toal, V.: Characterisation of an acrylamide-based photopolymer for data storage utilizing holographic angular multiplexing, J. Opt. A: Pure Appl. Opt, 7, 255-260, 2005. doi:10.1088/1464-4258/7/5/007