棒状光子晶体光纤种子光透镜耦合分析

摘要

The single-lens coupling system was analyzed.The relationship between the coupling efficiency and the position of the lens is calculated when focal length of the lens is 103.26 mm,and the relationship between the coupling efficiency and the focal length of the lens is calculated when the distance between the lens and the end of fiber is 120 mm.The coupling experiment was conducted by using single-lens coupling system,and the seed in the experiment is a 1030 nm SESAM mode-locked solid-state laser(M2≤ 1.2) and the diameter of ROD-PCF core is 85 μm (DMF =65 μm).Finally,the measured coupling efficiency is about 35％ ～ 42％.Because the doped Yb3 + ions in the fiber has a certain absorption effect on the 1030 nm laser,the actual coupling efficiency should be greater than the measured value.%本文对单透镜耦合系统进行了分析.分别模拟计算了当耦合透镜F=103.26 mm时耦合效率与透镜位置的关系,以及当透镜与光纤端面的距离为120 mm时耦合效率与透镜焦距的关系.利用单透镜耦合方式对棒状光子晶体光纤进行了耦合实验,实验所用种子源是波长λ=1030 nm的SESAM锁模固体激光器(M2≤1.2),所用棒状光子晶体光纤的芯径D=85 μm(模场直径DMF=65 μm),测得耦合效率约为35％ ～ 42％.由于光纤中掺杂的yb3+离子对1030 nm波长的激光有一定的吸收作用,因此实际的耦合效率应该大于测定值.