研究了阶跃折射率分布的百微米芯径双包层光纤激光器的输出特性及其模式控制技术。理论上对光纤缠绕法模式控制技术应用于百微米芯径光纤激光器的可行性进行了分析。实验中, 采用腔内小孔法对百微米芯径光纤激光器的输出激光模式进行控制, 研究了不同孔径对输出激光光束质量的影响。在腔内不加小孔时输出激光x,y方向的光束质量因子M2分别为4.67和4.60, 在腔内加入直径为2 mm的小孔后, x,y方向的光束质量因子M2分别为1.96和2.01, 腔内小孔对输出激光的光束质量有明显的改善。

The output characteristic of hundred-micron core diameter fiber laser and its mode control technique are researched. In theory, feasibility of which using winding to control the modes of hundred-micron core diameter fiber laser is analyzed. In experiment, output modes of hundred-micron core diameter fiber laser are controled by the hole in the laser cavity, and the effects to beam quality are researched with holes of different diameters.When there is no hole in the laser cavity, the beam quality factors M2 are 4.67 and 4.60 in x and y direction. After adding 2 mm diameter holes in the cavity, the beam quality factors M2 are 1.96 and 2.01 in x and y direction.The beam quality is improved remarkably by the holes.