强泵浦下掺Yb3+双包层光纤激光器输出特性数值分析和实验研究

对强泵浦下线形腔掺Yb3+双包层光纤激光器输出特性进行了理论和实验研究。通过数值模拟,分析了泵浦光及激光在光纤中的分布、输出功率与泵浦功率的关系、光纤长度及腔镜反射率对激光输出功率的影响。在实验中,利用D型掺Yb3+双包层光纤获得了输出功率10 6W的光纤激光输出,斜率效率达86%。测量了在不同输出耦合条件下的输出功率、阈值泵浦功率和斜率效率,理论分析与实验结果基本一致,为进一步提高光纤激光器功率提供了理论和实验依据。

Numerical analysis and experimental results of output characteristics for strongly pumped Yb3+-doped double-clad fiber laser

The output characteristics of strongly end-pumped Yb~(3+)-doped double-clad fiber lasers with linear cavity are studied in theories and experiments. Based on the rate equations of fiber lasers, the distributions of pump light and laser power along the DCF fiber, the relations of output power with pump power, as well as the effects of fiber length and cavity reflectivity on output power are got by means of numerical analysis. The maximum cw output power of 10.6W and slope efficiency of 86% is obtained by the Yb~(3+)-doped D-shaped double-clad fiber laser in experiments. With different output couplers, the output power, threshold pump power and slope efficiencies of the fiber laser were measured. Experimental results are coincident with theoretical analysis very well. It will be helpful for scaling the power of fiber lasers in theories and experiments.