余弦高斯光束被无光阑透镜聚焦后的焦开关  

Focal switch of cosine-Gaussian beams focused by a thin lens without aperture

作　　者：季小玲[1] 吕百达[2] 

机构地区：[1]四川师范大学电子工程学院,成都610066 [2]四川大学激光物理与化学研究所,成都610064

出　　处：《激光技术》2005年第6期654-656,共3页Laser Technology

基　　金：四川省教育厅自然科学基金资助项目(2002A089)

摘　　要：研究了余弦高斯光束通过无光阑透镜后的焦开关现象。推导出了轴上最大光强位置满足的一元三次方程和相对跃迁量公式,并做了大量的数值计算。研究表明,当光束参数β>1时,聚焦余弦高斯光束会有焦开关现象出现。The focal switch of cosine-Gaussian beams focused by a thin lens without aperture is studied in detail. The thirdorder equation governing the position of axial maximum intensity and the formula of the relative transition height is derived. A large number of numerical calculation results are presented. It is shown that the focal switch of focused cosine-Gaussian beams can take place as the beam parameterβ is larger than 1.

关 键 词：焦开关 余弦高斯光束 光束参数β 无光阑透镜 

分 类 号：O435[机械工程—光学工程]