3.5μm Er:ZBLAN光纤激光器及放大器数值仿真

Numerical simulation of a 3.5μm Er:ZBLAN fiber laser and amplifier

本文利用双波长泵浦(DWP)技术建立了3.5μm Er:ZBALN光纤激光器及光纤放大器的理论模型。研究了光纤不同参数下激光器及放大器的能级粒子数动力学行为及沿光纤长度上光功率分布特征,计算分析了光纤长度、输出端反射率、钾离子掺杂浓度对于3.5μm激光功率的影响。研究结果显示了光纤长度、输出端反射率存在的最佳范围,高掺杂饵离子浓度光纤相对于低掺杂仅需要较低的976nm泵浦功率即可实现有效的3.5μm激光输出,且高掺杂浓度下的交叉驰豫过程能阻止猝灭行为,模拟实现了3.5μm光纤激光的高效放大。数值模拟结果对3.5um激光振荡器及高功率放大的参数设计具有指导意义。

This paper establishes the theoretical model of 3.5μm-Er:ZBALN fiber laser and fiber amplifier using dual-wavelength pumping(DWP)technology.The kinetic behavior of the energy level particle number for the laser oscillator and amplifier and the laser power distribution along the fiber length under different fiber parameters are investigated.The effects of fiber length,output reflectivity,and erbium-doping concentration on the 3.5μm laser power are calculated and analyzed.The results show that an optimal range of fiber length and output reflectivity.High erbiumdoped fibers require only a lower 976 nm pump power compared to low erbium-doping to achieve an effective 3.5μm laser output.The cross-relaxation process of high doped concentration prevents the quenching behavior.Simulations achieve an efficient amplification of the 3.5μm fiber laser.The numerical simulation results are instructive for the 3.5μm laser oscillator parameter design and high power amplification.