光折变晶体中全息图的热固定过程研究  

Study on Thermal Fixing Process of Holograms in Photorefractive Crystals

作　　者：宋雪华[1] 陶世荃 江竹青[1] 刘国庆[1] 

机构地区：[1]北京工业大学应用物理系,北京100022

出　　处：《中国激光》2001年第1期59-62,共4页Chinese Journal of Lasers

摘　　要：报道了Fe∶LiNbO3和Ce∶Fe∶LiNbO3晶体中红光波段记录的光栅的热固定实验 ,详细描述了光折变晶体中全息图热固定的定影和显影工艺。在定影过程中测量了光栅峰值衍射效率随温度的变化。显影实验表明用原参考光显影会引起光栅的自增强衍射、布拉格角偏移、选择角增宽和背景噪声增加 ,采用非相干光显影可避免这些缺点。提出了一种降低光相干性的方法 ,从而可以采用原记录光路进行显影。The technology of fixing and developing for thermal fixing test of holograms in photorefractive LiNbO3 crystals was described. The dependence of the peak diffraction efficiency of grating on the temperature was measured at fixing stage. The experimental results of developing show that developing by reference beam would lead to self-enhancement diffraction, Bragg-angle shift, selective angle broadening and scattering noise increasing. Developing by incoherent light can avoid these disadvantages. A method of decreasing coherent degree of light was proposed for developing by original recording optical set-up.

关 键 词：光栅 全息存储 光折变晶体 全息图 热固定过程 

分 类 号：O438[机械工程—光学工程]