数值模拟975 nm和1975 nm双波长泵浦3.5 μm Er∶ZBLAN光纤激光器。计算给出激光功率和粒子数密度随时间和位置的二维分布,计算结果与实验报道吻合较好。模拟双波长泵浦3.5 μm Er∶ZBLAN光纤激光器实现稳定连续激光振荡的整个过程,计算分析泵浦功率、1975 nm泵浦光重叠因子、输出镜反射率、离子间相互作用等参数对3.5 μm激光功率的影响,分析ESA2产生显著影响的条件。数值模拟对深入理解双波长泵浦3.5 μm Er∶ZBLAN光纤激光器的动力学过程和优化激光器设计有一定指导意义。

975 nm and 1975 nm dual-wavelength pumped 3.5 μm Er∶ZLBAN fiber lasers have been numerically modeled. Laser power and particle density are estimated in both time and space dimensions and simulation results match well with the experimental reports. The whole process of stable continuous laser oscillation in a dual-wavelength pumped 3.5 μm Er∶ZBLAN fiber laser is showed by simulation. 3.5 μm laser characteristics are estimated and studied with different fiber parameters, such as pump power, 1975 nm pump mode overlap factor, reflectivity of output lens, and interionic interaction. The condition in which ESA₂ process has great influence on laser power is also investigated. Simulation promotes the understanding of 3.5 μm Er∶ZLBAN laser dynamics and provides valuable insight for laser designing.