基于Talbot效应的掺镁铌酸锂二维六角位相阵列光栅的研究  

A study of two-dimensional hexagonal phase array grating in MgO:LN based on the Talbot effect

作　　者：范天伟[1] 陈云琳[1] 张进宏[1] 

机构地区：[1]北京交通大学理学院,北京100044

出　　处：《物理学报》2013年第9期249-254,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号: 61178052);北京交通大学校基金(批准号: 2011JBM122; 2011JBZ013)资助的课题~~

摘　　要：本文系统研究了基于泰伯效应(Talbot)的位相可调掺镁铌酸锂二维六角位相阵列光栅及其光衍射成像,对光栅占空比 D、不同位相差φ、及泰伯分数β条件下的光栅近场光衍射强度分布进行了理论研究, 结果表明当光栅占空比 D = 52%、位相差φ = 0.75 π、泰伯分数β = 0.2 时, 光栅近场衍射光图像效果最佳. 实验设计与制备了掺镁铌酸锂二维六角位相阵列光栅,并对其进行了Talbot衍射光成像实验研究,得到了不同位相差和不同泰伯分数β条件下光栅近场衍射光图像,实验结果与理论研究结果相符.In this paper, theoretical researches on the MgO：LN tunable hexagonal phase array grating based on the Talbot effect were presented. Researches revealed the effects on the intensity distribution of near-field diffraction from array grating duty cycle which is defined as D, phase difference which is defined as φ and the distance coefficient which is defined as β . The results obtained show that good near-field diffraction images can be achieved at D = 52%, φ = 0.75π, β = 0.2. Based on the theoretical researches, the tunable hexagonal phase array grating is designed and fabricated from periodically poled MgO：LN crystal. Through experimental test, the Talbot effect diffraction imaging map is successfully obtained at different φ and β , which verifies the results of the theoretical researches.

关 键 词：二维六角位相阵列光栅 掺镁铌酸锂晶体 泰伯效应 

分 类 号：O436.1[机械工程—光学工程]