机构地区: 天津大学精密仪器与光电子工程学院
出 处: 《激光杂志》 2005年第5期42-43,共2页
摘 要: 准直一聚焦双透镜系统是光纤激光器中常用的一种泵浦耦合技术,但是对于大功率LD泵浦源尾纤输出的多模类高斯光束,难以解析表达其中高阶模式的透镜变换规律,根据此设计透镜耦合系统过程也很复杂。本文用几何光学的方法保证数值孔径的匹配,以类高斯光束光斑尺寸作为基模高斯光束束腰,用基模高斯光束传播规律来简化大功率光纤激光器透镜耦合系统的优化设计.最后给出了一个利用MAT-LAB优化工具函数设计双透镜聚焦耦合系统的实例。 The collimating- focusing teehnique by two lens often applies to the coupling system of fiber lasers, while for the mixed mode or Gaussian - like beam output from LD of high power it is difficult to accurately determine the changes through lens, so that leads to a knotted design process of lens - coupling system. NA- match was realized in terms of ray optics, and by assuming a fundamental Gaussian beam (FGB) with same spot size as the Gaussian - like beam, the propagation principle of FGB was used to simplify the optimum design process of lens - coupling system in high power fiber lasers. Finally by using MATLAB's optimum tools, an instance was involved to illustrate.