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7 February 2005 Compound sensitizing for improving exposure sensitivities of photopolymer system
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In this paper, a blue-sensitive photopolymer holographic recording material was prepared. The visible-light sensitive photoinitiating system was composed of sensitizer, initiator, hydrogen-donor, monomer and binder. Compound sensitizing as a new method for improving exposure sensitivity of this material was proposed. Experiments results indicate that compound sensitizing significantly increased the exposure sensitivity from about 55mJ/cm2 to 40 mJ/cm2, while without any affection to the maximum obtainable diffraction efficiency. More than 85% of transmission grating diffraction efficiency can be attained as a very simple post process was performed. Mechanisms of polymerization and hologram formation were discussed. The holograms, with a good physical and chemical stability under ambient circumstance, have much potential in optical communication, such as filters and switches.
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Yan Sheng, Heling Zhang, Xiaojing Hu, Ruiqu Zhao, and Yunzhi Wang "Compound sensitizing for improving exposure sensitivities of photopolymer system", Proc. SPIE 5636, Holography, Diffractive Optics, and Applications II, (7 February 2005);

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