利用相切条件研究TeO_2晶体反常声光衍射几何关系  

Study of Anisotropic Acousto-optic Diffraction Geometry in TeO2 Crystal by Tangent Condition

作　　者：俞宽新[1] 史先军[1] 赵宝森[1] 何士雅[1] 

机构地区：[1]北京工业大学应用数理学院,北京100022

出　　处：《北京工业大学学报》2002年第2期211-215,共5页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(60077017);北京市教委基金资助项目(P06040101).

摘　　要：利用相切条件推出了计算TeO2晶体反常声光衍射几何关系的方程,给出了zt平面内光波矢量的入射角和衍射角、超声极值频率、声光优值等参数随超声离轴角而变化的曲线.该计算方法比传统的求解Dixon方程的方法更简捷和精确.计算结果表明,TeO2反常声光器件的中心频率存在最小阈值;对于相同的中心频率,+1级衍射状态优于-1级衍射状态.为了设计器件的方便,还列出了中心频率在200MHz以下 TeO2反常声光器件的各设计参数及性能参数.Some equations of anisotropic acousto-optic (AO) diffraction geometry have been derived by the aid of tangent condition. The relationships of incident angle of optic wave vector, diffraction angle of optic wave vector, acoustic extremum frequency and AO merit vs acoustic deviation angle in z-t plane are given in detail. These equations are more simple and accurate than traditional Dixon equations. The calculation results indicate that the center frequencies of the TeO2 anisotropic AO devices have a minimum threshold, and the mode of the +1 order diffraction is better than -1 order to same center frequency. For the convenience of the device design, some design parameters and function parameters are showed for the TeO2 anisotropic AO device below the center frequency of 200 MHz.

关 键 词：反常声光衍射 TeO2晶体 相切条件 

分 类 号：TN65[电子电信—电路与系统]