Thermal Fixation of the Photorefractive Holograms Recorded in Lithium Niobate and Related Crystals
Thermal Fixation of the Photorefractive Holograms Recorded in Lithium Niobate and Related Crystals
复制标题
铌酸锂及相关晶体中记录的光折变全息图的热固定
DOI：
10.1080/10408430500198631
复制
发表时间：
2005
影响因子：
10.8
通讯作者：
M. Wöhlecke
中科院分区：
文献类型：
--
作者：
T. Volk;M. Wöhlecke
以LiNbO3为重点，综述了光折变全息图热固定的基本原理、40多年来的发展和最新应用。热固定是在光折变介质中实现光学稳定存储的最有前途的方法。热固定的微观起源主要是由在120°C左右热激活的质子屏蔽电子空间电荷引起的。在固定之后，实现了与未处理的晶体相当的衍射效率，并且已经观察到至少2年的寿命，而对于特殊的布置，科学合理的估计指向高达100年的长期。理论上的描述是相当完善的，并将指导进一步的改进。热固定全息图已经在基于全息图复用的非易失性光学存储系统中进行了测试，并且是具有非常高的角度选择性的窄带设备的基础。
With emphasis on LiNbO 3 the basic principles, the developments over four decades, and recent applications of the thermal fixation of photorefractive holograms are reviewed. Thermal fixing is the most promising method to realize optically stable memories in photorefractive media. The microscopic origin of thermal fixing is mainly caused by screening the electronic space-charges by protons thermally activated at about 120°C. After fixing a diffraction efficiency comparable to that of untreated crystals is achieved and lifetimes of at least 2 years have been observed, whereas for special arrangements scientific sound estimates point to long terms as high as 100 years. A theoretical description is quite well established and will guide further improvements. Thermally fixed holograms have been tested in nonvolatile optical storage systems based on hologram multiplexing and are the basis in narrow-band devices with very high angular selectivity.