钾钠铌酸锶钡的全息存储特性研究

发布时间：2018-02-13 02:35

本文关键词： 全息存储体相位栅衍射效应钾钠铌酸锶钡晶体　出处：《西安工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：全息存储作为一种具有很大潜力的信息存储技术一直以来都是人们研究的热点之一。尽可能的实现信息的海量存储以及数据的高速寻址也是现今该领域研究的主要关注点,因此,对全息存储介质的研究具有十分重要的意义。理想的全息存储介质不仅要能够满足信息的大容量存储,同时还要能够及快速的响应数据信息以及获得高保真的再现像。在已有的对全息存储材料的研究中,能够同时满足存储容量、存储性能以及低成本价格的理想材料仍处于探索阶段。对于早日实现全息存储的广泛商业化应用而言,首先需要解决的问题就是发现理想的全息存储材料。本文主要针对钾钠铌酸锶钡晶体的全息存储特性进行了理论分析与实验研究。其主要的研究内容包括：(1)理论研究了全息存储技术、全息存储机理、光折变效应及耦合波理论等。通过理论研究提出钾钠铌酸锶钡晶体可作为全息存储介质的猜想,并进一步通过实验证实。(2)入射光斑大小对于全息再现像像质的影响。通过改变物光与参考光的入射光斑大小,分别对物光光斑大于参考光光斑大小；物光光斑等于参考光光斑大小；物光光斑小于参考光光斑大小三种条件下的全息再现像进行像质分析,实验结果显示当物光光斑大于参考光光斑大小时全息再现像像质最好。(3)钾钠铌酸锶钡晶体的全息存储入射角度范围(动态范围)研究。实验保证单一变量,通过对实验光路中参考光入射角度的改变对其对应的全息再现像像质进行分析,研究结果表明,钾钠铌酸锶钡晶体的可存储入射角度范围为20°36‘～40007’,该结构间接反映了钾钠铌酸锶钡晶体的动态范围。(4)钾钠铌酸锶钡晶体的衍射效率研究。首先研究了体相位栅在晶体内的不同位置下全息再现像的持续时间变化,随后跟进研究结果进一步对再现像衍射效率进行研究,得出结论：当晶体内形成的体相位栅完全在晶体内部时,再现像持续时间最长为262s,此时的衍射效率达到最大值31%。(5)钾钠铌酸锶钡晶体的响应时间研究。通过控制晶体的曝光时间对不同的曝光时间下得出的全息再现像衍射效率进行研究,结合响应时间定义得出钾钠铌酸锶钡晶体的响应时间为3s。(6)钾钠铌酸锶钡晶体的存储持久性研究。在晶体记录信息后不改变任何实验条件将其放置于黑暗条件下,分析存储不同时间后再现像情况,最终得到钾钠铌酸锶钡晶体的存储持久性为16小时。
[Abstract]:As a kind of information storage technology with great potential, holographic storage has always been one of the research hotspots. The realization of mass storage of information and the high-speed addressing of data are also the main concerns in this field. Therefore, the study of holographic storage media is of great significance. At the same time, it must be able to respond to the data information and obtain high fidelity images. In the existing research on holographic storage materials, it can satisfy the storage capacity at the same time. Storage performance and low-cost ideal materials are still in the exploration stage. The first problem to be solved is to find the ideal holographic storage material. In this paper, the holographic storage characteristics of potassium sodium strontium barium niobate crystal are studied theoretically and experimentally. The main research contents include: 1) theory. The holographic storage technology is studied. The holographic storage mechanism, photorefractive effect and coupling wave theory are studied. The hypothesis that potassium sodium strontium barium niobate crystal can be used as holographic storage medium is proposed. The effect of incident spot size on the image quality of holographic reconstruction is further verified by experiments. By changing the incident spot size of object light and reference light, the size of object light spot is larger than that of reference light spot. The object light spot is equal to the reference light spot size, the object light spot is smaller than the reference light spot size, and the holographic reconstruction image is analyzed for image quality under three conditions: the object light spot is smaller than the reference light spot size. The experimental results show that the holographic reconstruction image has the best image quality when the object light spot is larger than the reference light spot.) the holographic storage angle range (dynamic range) of the potassium sodium strontium barium niobate crystal is studied. By analyzing the change of the incident angle of the reference light in the experimental light path, the corresponding image quality of holographic reconstruction is analyzed, and the results show that, The storable incidence angle range of strontium barium potassium sodium niobate crystal is 20 掳36 / 40007, which indirectly reflects the dynamic range of potassium sodium strontium barium niobate crystal. (4) diffraction efficiency of strontium barium potassium sodium niobate crystal is studied. First, the diffraction efficiency of bulk phase grating in crystal is studied. The duration of holographic reconstruction at different positions within, The diffraction efficiency of the reconstructed image is further studied by following up the research results. It is concluded that when the bulk phase gate formed in the crystal is completely inside the crystal, The maximum duration of the reconstructed image is 262 s, and the diffraction efficiency reaches the maximum of 31and 5) the response time of strontium barium potassium sodium niobate crystal is studied. By controlling the exposure time of the crystal, the diffraction efficiency of the holographic reconstruction image obtained at different exposure times is studied. Combined with the definition of response time, it is obtained that the response time of strontium barium potassium sodium niobate crystal is 3s. 6) the storage persistence of potassium sodium strontium barium niobate crystal is studied. After recording the information of the crystal, it is placed under dark conditions without changing any experimental conditions. Finally, the storage persistence of potassium sodium strontium barium niobate crystal is 16 hours.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O438.1;TP333

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