红敏聚乙烯醇/丙烯酰胺体系光致聚合物全息记录材料的空间分辨力增强研究

针对目前聚乙烯醇/丙烯酰胺体系光致聚合物材料的空间分辨力不高的问题,提出了一种采用低相对分子质量的聚乙烯醇作为成膜剂来改进光致聚合物分辨力的新方法.采用不同相对分子质量(72000,15000,9000)的聚乙烯醇成膜剂制成光致聚合物,对其衍射效率和空间分辨力等指标进行了对比实验.实验表明选用低相对分子质量(9000)的成膜剂可将该体系光致聚合物的分辨力提高到3000 line/mm以上,实验中仅需40 mJ/cm2左右的曝光量即可获得85%的衍射效率.另外,还对该材料的全息存储特性及其在角度复用全息存储方面的初步应用结果进行了报道.

Spatial Resolution of Polyvinyl Alcohol/Acrylamide Based Photopolymer Holographic Recording Material

Polyvinyl alcohol/acrylamide based photopolymer system has a relatively low spatial resolution,which limits its wide applications in the fields such as reflection display holography,high-density holographic data storage,etc.A new strategy of employing low molecular-weight polyvinyl alcohol as binder to improve the spatial resolution of such photosensitive system is proposed.The comparative experiments of different photosensitive system with various molecular weights(72000,15000,9000 are conducted to study their effects on the diffraction efficiency and spatial resolution.The experimental results show that the photosensitive system with low molecular weight of 9000 has much higher resolution and diffraction efficiency,and bright volume transmission grating with spatial frequency of 3000 line/mm and diffraction efficiency higher than 85% can be recorded successfully on the optimum photopolymer material at the exposure level of 40 mJ/cm2.Finally,the preliminary applications of angular multiplexing holographic storage are successfully demonstrated.