绿敏光致聚合物的脉冲全息记录性能增强研究

The enhancement of pulse holographic recording characteristics of green-sensitive photopolymer

对绿敏聚乙烯醇/丙烯酰胺体系的光致聚合物材料开展了光敏剂浓度、单脉冲能量密度、脉冲重复频率、非相干光预曝光等参数优化及脉冲全息记录性能增强研究,发现曙红Y染料浓度为3×10-5w/v时需要310 mJ/cm2的曝光量可达到79%的衍射效率,单脉冲能量密度为0.35mJ/cm2时仅需122.5mJ/cm2的曝光量即可获得92%的衍射效率,提高脉冲激光重复频率及采用非相干预曝光对材料的最大衍射效率无明显提高,但可以有效提高材料的感光灵敏度,预曝光量为50mJ/cm2时可将光致聚合物材料的感光灵敏度从105mJ/cm2提高到52.5mJ/cm2。

By optimizing the parameters including pholosensitizer concentration, single pulse energy density, pulse repetition rate and preillumination with incoherent light and studying the enhancement of pulse holographic recording characteristics in green - sensitive photopolymer, diffraction efficiency can achieve to 79% after exposuring 310 mJ/cm2 with the Eosin Y sensitizer at the concentration level of 3 × 10-5w/v, and with the optimized single pulse energy density of 0. 35 mJ/cm2, the diffraction efficiency up to 92% can be obtained at the exposure of 122.5mJ/cm2, and improving the pulse repetition rate and using preiUumination won＇t contribute to the maximum diffraction efficiency of the hologram, but the photosensitivity will effectively improved, the photosensitivity of the material will improve from 105mJ/cm2 to 52.5mJ/cm2 with the preillumination of 50 mJ/cm2.