余弦高斯光束在梯度折射率介质中的传输特性  

Propagation properties of cosine-Gaussian beams in gradient-index medium

作　　者：宋宏远[1] 张廷蓉[1] 陈森会[1] 黄永超[1] 李艳桃[1] 张伟林[1] 

机构地区：[1]四川师范大学物理与电子工程学院,成都610066

出　　处：《强激光与粒子束》2011年第4期890-894,共5页High Power Laser and Particle Beams

基　　金：四川省教育厅重点项目(09ZA089)

摘　　要：为了研究光束在梯度折射率介质中的传输规律,利用广义惠更斯-菲涅耳衍射积分法,推导出余弦高斯光束在梯度折射率介质中传输的解析表达式,对余弦高斯光束在梯度折射率介质中的传输特性进行了分析,并进一步讨论了介质梯度折射率系数和调制参数对传输特性的影响。结果表明,余弦高斯光束在梯度折射率介质中传输时,轴上光强分布呈现周期性变化,横向光强分布受梯度折射率系数和调制参数影响较大。余弦高斯光束传输时具有不稳定性,通过适当调节参数,可在空间某位置实现余弦高斯光束的整形。Using the method of generalized Huygens-Fresnel diffraction integral,this paper deduces the analytical expression of cosine-Gaussian beams propagating in a gradient-index medium,and analyzes the corresponding propagation properties of cosine-Gaussian beams.The influence of the medium＇s gradient-index parameter and the modulation parameter on the propagation properties is also discussed.The results show that the intensity of cosine-Gaussian beams propagating in a gradient-index medium varies periodically on axis.The transverse intensity distribution is largely influenced by the modulation parameter.The transmission of cosine-Gaussian beams is unstable,but the cosine-Gaussian beams can be reshaped through appropriately adjusting the modulation parameter at some spatial position.

关 键 词：余弦高斯光束 广义衍射积分法 梯度折射率介质 传输特性 近轴光学系统 

分 类 号：O436[机械工程—光学工程]