基于模式调谐移位复用的共光轴体全息光盘技术研究

项目名称： 基于模式调谐移位复用的共光轴体全息光盘技术研究

项目编号： No.61275013

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 曹良才

作者单位： 清华大学

项目金额： 75万元

中文摘要： 体全息光盘可以达到TB量级，是下一代绿色海量存储技术之一。参考光和信号光共光轴的新型存储方案由于结构紧凑和鲁棒性强，一经提出就成为研究热点，已被列为体全息存储迈向实用化的关键技术。本项目在共光轴体全息光盘中首次提出模式调谐移位复用技术的概念，对参考光采用正交模式调谐，有望将存储密度提高一个数量级。首先建立离散化数字式共光轴全息图的光场分布模型，研究参考光模式调谐的噪声抑制机理和移位复用参数优化方法；探索相位和波长模式调谐方法，改善光场分布并实现多阶与多维高密度存储；研究温度变化时由于材料形变导致光栅退化与记录点移位后的噪声形成机理，研究参考光模式精细调谐方法和记录点精密移位锁定方法，实现对光盘系统工作温度变化的自动补偿。最后采用高数值孔径超长工作距物镜，构建共光轴体全息光盘实验平台，基于模式调谐移位复用技术，实现16阶相位存储、单盘容量达到10TB、系统工作温度适应范围达到室温正负20度。

中文关键词： 体全息存储；同轴全息；全息聚合物；多层存储；布拉格选择性

英文摘要： As one of the next generation large scale data storage technologies, volume holographic storage can hold the capacity of about one tera bytes per disk. The new coaxial volume holographic storage architecture has been listed as the key technology for the commercialization because of its compact and robust features soon after it is invented. In this project, for the first time we propose a concept of pattern-modulated shift multiplexing for the coaxial volume holographic disk system. The capacity could be enhanced by one order when the reference pattern is elaborately modulated. The physical model of the discrete digital coaxial hologram will be proposed and analyzed. The noise suppression function of the reference pattern modulation method will be investigated and the parameters of the shift multiplexing method will be optimized. The phase and wavelength pattern modulation method will also be invented for high density multi-level and multi-dimensional storage. When the temperature varies, the deformation of the media could make the Bragg grating distorted and the recording spot could shift at a very small pitch. Thus the noise of the readout signal could be serious. We will propose a fine modulation method of the reference pattern and high precision positioning method to automatically compensate the temperature

英文关键词： Volume holographic storage；collinear holography；holographic photopolymer；multilayer storage；Bragg selectivity