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题名	数字全息光存储光致聚合物材料的研究
作者	姚华文
学位类别	博士
答辩日期	2003
授予单位	中国科学院上海光学精密机械研究所
导师	干福熹
关键词	光全息存储 光致聚合物 优化 角度复用
其他题名	Research of acrylamide based photopolymer for digital holographic storage
中文摘要	本文在综述光全息存储技术发展和有机光致聚合物材料的光存储原理、材料性能和当前光聚物材料的最新发展的基础上，通过测试了本课题组制备的光聚物材料的光存储性质，探讨了光致聚合物材料的聚合化原理，材料组成对光聚物全息、存储性能的影响。利用制备的光聚物进行了全息、存储实验，理论上探讨了利用光聚物材料进行全自、存储的可能性，为光聚物材料进行大容量体全息存储提供了实验依据。系统研究了以AA、BAA为单体，以TEA为电荷转移剂，ErB为光引发剂，PVA为粘结剂的光致聚合物材料。我们推测光化学反应经历了一个三步过程。通过对光化学反应动力学的研究，我们初步得出了吸收强度与时间之间的关系、单体浓度变化与时间及单体浓度与折射率调制之间的关系。通过对光聚物中各种组成成分的优化实验，我们对组分在光聚物中的作用有了较明确的认识。即各种组分在光聚物材料都有一个最佳浓度，超过或低于这个浓度值都使光聚物材料的性能有所下降。样品中染料的浓度最佳值为5*10~(-4)M，光聚物中染料浓度过高会发生二聚现象。TEA在样品中的量为O.27M时，样品的灵敏度最大。对单体的优化发现，AA与BAA之间有一种相互促进的作用，当固定BAA浓度时，AA的浓度低时，样品的衍射效率也很低，但随着AA量的增加，材料的衍射效率不断上升，但当AA浓度达到O.25M后，衍射效率就比较稳定。当BAA的浓度为0.0324M，AA的浓度为0.25M时材料的衍射效率便可以达到最大。我们保持BAA：AA为1:6不变，当单体的浓度很低时，样品的衍射效率和灵敏度也都很低，但当单体浓度逐渐增加，则样品的衍射效率与灵敏度快速增大，这充分说明了材料的灵敏度随单体浓度增加而提高。材料中掺杂少量的塑性剂二亚甲飒（DMSO）时，光聚物材料更加均匀，同时增大了光聚物的折射率调制度。但掺杂较多DMSO时材料的衍射效率下降，但对材料的灵敏度影响不是很大。戊二醛（GA）的掺杂明显的增加了材料的折 射率调制度△n，折射率调制度的增大是由于GA促进了光聚物材料的光聚合化反应的进行，从而导致了衍射效率的增加。通过对电荷转移剂TEA与DPI进行的研究，我们发现二者之间有超掺杂效应。此外，研究发现，TEA在光引发阶段有更强的作用，并且传输染料的生成物时更有效，而DPI的主要作用是在光聚合的传输阶段，DPI能够有效提高光聚物的量子产率，并且使单体自由基更加稳定。实验制备了对多波长敏感的光聚物材料，材料中MB的最大吸收峰在666nm处，而ErB的最大吸收峰在528nm，可以用633nln和514.5nm的波长分别曝光。论文具体讨论了材料中同时掺杂了ErB与MB后，材料的最大衍射效率比单独掺杂某种染料时的低，且灵敏度也降低的主要原因。此外通过使用实验室制备的材料进行了光全息的模拟存储和数字存储实验，以及角度复用全息存储实验，结果发现，再现像与原始像之间的区别不大。全息图的角度选择性实验结果与Kogelnik的藕合波理论较好符合，充分说明我们的材料具有较好的光学性质，适宜于大容量体全息存储。
英文摘要	On the base of reviewing the progress of holographic storage technology, the principle of the photopolymerization of photopolymer, the performance of materials and development of modern photopolymers, and by measuring the characterization of photopolymers made in our laboratory, the principle of photopolymerization process, the influence of photopolymer's composition to the storage performance were discussed in this paper. And by using the photopolymers prepared in our laboratory, we theoretically discussed the possibility of holographic storage by photopolymers, and which have provided experimental proofs for high-density volume holographic storage. Photopolymer constituted by AA and BAA as monomers, TEA as charge transfer reagent, ErB as photo initiator and PVA as binder was systemically studied. We suspected the photopolymerization reaction as a 3-step process. After researched the photopolymerization dynamics, we elementary got the relationship of absorption intensity to the time, the change of monomers' concentration to time, and the monomer's concentration to the refractive index modulation. By optimization the contents of photopolymer, we have attained a clear knowledge of every components' function in the material. Each component have a optimal concentration value, the performance of photopolymer will decrease when the concentration of component is higher or lower than this concentration value. The optimal concentration of dye in the sample is 5xlO~4M, if the concentration of dye get too high, the dye will become dimeric polymer which will decrease the performance of photopolymer greatly. When the concentration of TEA in the material is 0.27M, we can get highest sensitivity. To the monomers, we found that there was a mutual promotion mechanism between AA and BAA. When we fixed the concentration of BAA and change the AA, if the concentration of AA was very low, then the maxim diffraction efficiency was low too, but the maxim diffraction efficiency increased as the concentration of AA increased, when the concentration of AA was 0.25M, the maxim diffraction efficiency become stable. When the concentration of BAA in the material is 0.0324M, and AA, 0.25M, we can get the highest diffraction efficiency. When we keep the ratio of BAA to AA as 1:6, when the concentration of monomers are very low, the diffraction efficiency and sensitivity of material are all very low, but when the concentration increased, the diffraction efficiency and sensitivity increased quickly, which sufficiently proved that the sensitivity of photopolymer increased as the concentration of monomers increased. When we doped some plasticizer dimethyl sulfoxide (DMSO) in the photopolymer, the material would become more uniformed, and at the same time, the photopolymer's refractive index modulation increased. But too much DMSO will decrease the material's diffraction efficiency, but the sensitivity is little influence. The doping of glutaraldehyde (GA) clearly improved the refractive index modulation of photopolymer. The reason of this is because GA promoted the photopolymerization process of the material, and which leading to higher diffraction efficiency. We studied the mechanics of charge transfer agents TEA and DPI in the photopolymer, and found that there are super adulteration effects in them. After that, we found that TEA has more intense effect in photoinitiate process and more effective in transferring the resultant of dye, while the main effect of DPI is in the photopolymerization's transferring process, DPI can effectively increase the quantum yield efficiency and make the radical of monomer's more stable. We also prepared photopolymer sensitive to multi-wavelength. The maxim absorption peak of methylene blue in photopolymer is 666nm, while the absorption peak of erythrosine B in the photopolymer is 528nm, so we can use 633nm and 514.Sum's wavelength laser to exposure the photopolymer respectively. We particularly discussed the reason why the maxim diffraction efficiency and sensitivity of the photopolymer doped with two kinds of dye is lower than those doped with only one dye. Furthermore, we did experiments of simulation hologram; digital hologram and angle multiplexed holographic storage using photopolymers made in our laboratory. And we found that the distinguish between reconstruction image and prime image was small. The result of angle selective experiment can fix with Kogelnik's couple wave theory preferably that effectively proved our material has excellent optical performance and is suitable for large content volume holographic storage.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/15353]
专题	上海光学精密机械研究所_学位论文
推荐引用方式 GB/T 7714	姚华文. 数字全息光存储光致聚合物材料的研究[D]. 中国科学院上海光学精密机械研究所. 2003.

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