透镜球差对光纤输出激光器耦合效率的影响  

Effect of spherical aberration on coupling efficiency of a fiber-output laser

作　　者：余神求[1] 文建国[1] 

机构地区：[1]国湖南大学计算机与通信学院,湖南长沙410082

出　　处：《激光与红外》2009年第5期524-527,533,共5页Laser & Infrared

基　　金：湖南省自然科学基金(No.05JJ30114)资助

摘　　要：使用光线追迹法分析高斯光束的透镜变换过程。首先使用高斯光束的透镜变换公式计算透镜的焦距及放置位置等耦合系统的参数,然后建立直角坐标系并利用耦合系统的参数构建方程,对边缘光线追迹,计算出像方束腰半径值。根据两种不同方法计算的束腰值计算激光束与光纤的耦合效率并进行比较,得出透镜的球差使得耦合效率降低的结论。最后采用双胶合透镜对球差适当的消除,耦合效率得到提高。Being not considerated the influence of spherical aberration, the coupling efficiency of fiber-output laser computed by Gaussian beam lens formula is higher. In this paper,the ray-tracing method is used to analyze the Gaussian beam lens trannspositional process. Firstly, to abtain the parameters of coupling system, such as the focal length and the position of the lens, computing the Gaussian lens formula,then establishing the rectangular coordinate system and constructing equation and tracing the marginal ray to compute the parameter of the radius of the image beam waist. Calculating the coupling efficiency between fiber and beam by different waist beam which computed by different method, then comparing. The result indicates that the spherical aberration of positive lens reduce the coupling efficiency. At last, the coupling efficiency is improved by using doublets rathar than single lens.

关 键 词：耦合效率 球差 光线追迹 束腰半径 

分 类 号：O437[机械工程—光学工程]