KNSBN晶体全息再现像质量的研究  

Study on the Reproduced Image Quality of Volume Holographic in Crystal KNSBN

作　　者：范蕾[1] 王晓颖[1] 李武军[1] 孙平平[1] 

机构地区：[1]西安工业大学理学院,西安710021

出　　处：《西安工业大学学报》2014年第12期960-963,974,共5页Journal of Xi’an Technological University

摘　　要：为了研究钾钠铌酸锶钡KNSBN晶体的全息存储特性,设计了相关实验结构,通过改变物光与参考光在KNSBN晶体中形成的体相位栅的位置,研究了体相位栅在晶体内不同位置对体全息再现像质量的影响及再现时的衍射效率.研究结果表明：当体相位栅到晶体前端的距离为2.0-3.5mm时,再现图像质量相对稳定;当距离L=3.0mm时衍射效率达到最大值31%,此时再现像保持时间最长,可达到262s;图像质量最好,亮度大,稳定性好且再现像不失真.实验结果证实了KNSBN晶体可作为一种优良的体全息存储介质,且在体全息存储中,尽可能的将物光与参考光叠加形成的体相位栅置于晶体内部时,再现时将能得到较高的衍射效率和质量较高的再现图像.The self-designed experiment system was established to research the holographic storage properties of potassium sodium strontium barium niobate crystal-KNSBN.The different position of the volume grating in the crystal,which affected the quality of reproduced image and diffraction efficiency of reproduction,was studied by changing the position of object light and reference light in crystal KNSBN.The reproduced image quality was best and the reconstructed image kept a longest time and relatively stable,when the distance between volume phase grating and the front of crystal was in the range of 2.0-3.5mm,especially the diffraction efficiency was 31% when the distance L=3.0mm.This time produced image duration was longest,262 seconds,image quality was best,luminance was biggest,stability was best and produced image did not distortion.The experimental results confirmed that the crystal KNSBN could be used as an excellent volume holographic storage media,and it obtained high diffraction efficiency and high quality image reproduction when the position of volume phase grating,which was formed by the overlapping of the object light and reference light,was completely in the crystal.

关 键 词：体光栅 KNSBN 衍射效应 再现像质量 

分 类 号：O438.1[机械工程—光学工程]