利用可变光阑实现双轴晶体动态外锥折射  

Realization of Biaxial Crystal Dynamic Outer Conic Refraction by Using Iris

作　　者：凌铭[1] 董渊[1] 金光勇[1] 梁柱[1] 

机构地区：[1]长春理工大学激光技术研究所,长春130012

出　　处：《光子学报》2009年第12期3261-3263,共3页Acta Photonica Sinica

基　　金：吉林省杰出青年科技发展项目(20060121)资助

摘　　要：介绍了一种获得晶体动态外锥折射的方法.用全固态绿光激光器和双轴晶体kNbO3,通过改变位于已消球差的双胶合透镜后表面处可变光阑的通光孔径,即改变入射光束的会聚角度,来实现入射光会聚角对外锥折射锥角的调制,由此得出双轴晶体kNbO3外锥折射的锥角表达式.实验结果表明,周期性改变孔径光阑通光孔径的大小(入射光束的会聚角度)时,外锥折射锥角也同步地发生周期性的改变;外锥折射锥角等于入射于双轴晶体端面上的光线的会聚角.利用可变光阑可实现双轴晶体动态外锥折射并获得可控激光环,实验所测锥角角度与理论计算符合较好.The biaxial crystal dynamic outer conical refraction is obtaieded. After using kNbO3 and the solid- state laser emitted green beam, the transmission aperture of iris located in the back surface of aplanatic cemented double lens, is alternated in order to carry out that the incident light convergent angle modulate the outer conic refraction angle,so that the angle expression about outer conic refraction of biaxial crystal kNbO3 is accomplished. The experiment shows that the outer conical refraction angle synchronously varies when the size of iris aperture is alternated in periods and the angle is equal to the convergence angle of the beams,which incident to the end face of the biaxial crystal. The biaxial crystal dynamic outer conic refraction can be applied in the fields of laser radar and photric scanning. The theory calculation is coincident with the tested data.

关 键 词：双轴晶体 动态外锥折射 可变光阑 锥角 

分 类 号：O436.3[机械工程—光学工程]