| 题名 | 光聚物高度全息存储性能及其盘状数字及其盘状数字全息存储技术的研究 |
| 作者 | 黄明举 |
| 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 | 盘状数字全息存储 全息光盘 光致聚合物 角度复用技术 动态范围 曝光灵敏度 |
| 其他题名 | Studies of High-density Holographic Characteristic and Disk-type Digital Holographic Recording Technique of Photopolymer |
| 中文摘要 | 本论文在总结了当前高密度光学信息、存储特别是数字全息存储技术及用于数字全息存储的光致聚合物的全息性能研究现状的基础上，主要论述了作者在基于丙烯酞胺及亚甲基双丙烯酞胺单体的光聚物高密度数字全息存储性能及其盘状数字全息存储技术方面的研究工作：1．研究了材料的最大衍射效率、曝光灵敏度和分辨率等静态参数随曝光时间、曝光能量、记录时参物光的分光比等记录参数对这些参量的影响规律，并根据样品的光致聚合机理对这些规律进行了解释。2．研究了光聚物材料高密度全息存储所需参量如样品的最大折射率调制度、动态范围、曝光时间常数和曝光能量常数的表征和测试方法，建立了一套利用曝光特性曲线确定上述参量的系统方法，并与实验结合具体研究了样品的静态参量、高密度存储参数随光聚物样品厚度的变化规律及其光化学反应机理。在样品中用ASM方法进行了数字全息存储的实验，获得了较高存储密度、低误码率的实验结果。3．用实验的方法比较详细地研究了光聚物样品在O-40℃范围内其全息性能的变化规律，并对结果进行了合理的理论分析，结果发现在材料的玻璃化温度左右样品的全，氯胜能有较大的变化。4．分别用理论和实验的方法研究了光聚物全息样品曝光过程布拉格偏移与样品厚度收缩的百分比、折射率调制度、记录时参物光的入射角度曝光光强和曝光时间等之间关系。给出了记录过程中导致的样品布拉格偏移的理论公式及相应的计算结果，并与实验进行了比较。5．选择了适用于有机厚膜高密度数字全息存储的记录方案-ASM（角度复用加空间移位复用）方法，导出了该方案下数字全息光盘的记录容量和密度随记录条件变化规律的公式，计算了120mm盘状数字全息光盘的容量和密度，并与适用于无机光折变晶体的盘状数字全息存储方案-SAM（移位复用技术）方法进行了比较，计算结果显示ASM方法对具有较小厚度的有机厚膜存储介质能够获得比SAM方法更高的存储容量和密度。6．通过计算对光路的设置进行了优化和选择。计算表明，如果在参考光支路采用相同孔径比的透镜，对相同介质厚度和大小的数字全息光盘，由于采用双透镜4f系统实现角度复用的平面波做参考光束的方法参考光的记录扫描范围比采用单透镜实现角度复用的球而波方法要大，从而增加了系统能够实现的角度复用度，所以前者可以获得更高的存储容量和密度；同时还表明无论是球面波还是平面波做参考光，参考光的平均入射角度相对存储容量和密度均存在最佳值。 |
| 英文摘要 | The studies of high-density holographic characteristic and disk-type digital holographic recording technique of photopolymer are presented, especially the digital holographic recording techniques of photopolymers are investigated in this dissertation: 1. The changes of the maximum diffraction efficiency, exposure sensitivity, and the resolution of the photopolymer on the exposure time, exposure energy, the ratio of the recording intensity of reference beam to object beam are investigated. The causes of these changes are presented considering the mechanism of photo- polymerization of photopolymer. 2. The methods of describing and measuring of the static holographic parameters of photopolymers such as maximum refraction index, dynamic range, exposure time constant, and exposure energy constant are studied. A systematic method of calculating these constants based on the exposure characteristic curves is presented, and the changes and their mechanism of these static parameters on the thickness of photopolymer sample are investigated. The experiment of digital holographic recording is carried out, and the high recording density and low bit error rate (BER) are obtained. 3. The changes of the holographic characteristics of photopolymer sample between temperature 0-40°C are measured. It shows that the holographic characteristics change greatly near the glass transition temperature, 4. The relationships of the Bragg-mismatch caused by recording and parameters such as thickness shrinkage percent of sample, refraction index modulation, incidence angle of recording beams, exposure power and exposure time are investigated by experimental and theoretical methods respectively. The formula of Bragg- mismatch caused by exposure is deduced. The numerical results of the formula are presented, and are compared with experimental measurements. 5. ASM (angular multiplexing and shift multiplexing) method is used as the method of high-density digital disk-type holographic storage of photopolymer. The recording capacity and density of holographic disk are deduced. The results of calculation of the recording capacity and density of 120mm diameter holographic disk shows that ASM method can get higher recording capacity and density than that of SAM (spatial-angular multiplexing) method. 6. The optical setup of the high-density digital holographic recording system is optimized by numerical method. The calculating results show that we can get higher recording capacity and density by using plane wave reference beam caused by 4f optical system than that by using spherical wave reference beam caused by single lens. This is because the prior method can get a larger scanning angular if the same lenses are used in reference branch. It also shows that an optimal average incidence angle of reference beam exists to achieve maximum recording capacity and density no matter what kind of reference beam is selected. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15357]  |
| 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 | 黄明举. 光聚物高度全息存储性能及其盘状数字及其盘状数字全息存储技术的研究[D]. 中国科学院上海光学精密机械研究所. 2003. |
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