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利用1565nm激光作为Tm3+:Ho3+共掺石英光纤激光器的泵浦带是一项较新的研究内容,动态特性能够有效反映激光振荡机制建立过程中能级粒子数和激光功率的变化情况,为系统实验的优化提供理论依据。建立了该泵浦带下系统的理论模型,基于速率方程和功率传输方程,采用离散算法,在Matlab软件中设置泵浦功率为3W、光纤长度2.5m条件下,分别对Tm3+:Ho3+共掺石英光纤的输入端、中点处和输出端的动态变化特性进行理论研究。结果表明:不同位置处,光纤对泵浦功率的吸收程度不同;光纤中粒子数和激光功率的弛豫振荡开始和持续的时间表现出较大差异,信号光振荡峰值远大于达到稳态时的功率;系统的光-光转化效率达到56%。
The use of a 1565nm laser as a pump band for a Tm3 +: Ho3 + co-doped silica fiber laser is a relatively new study. Dynamic characteristics can effectively reflect the changes of energy level particles and laser power during the laser oscillation mechanism establishment. The optimization provides the theoretical basis. The theoretical model of the pumping system is established. Based on the velocity equation and power transmission equation, the discrete algorithm is used. In the Matlab software, the pump power is 3W and the optical fiber length is 2.5m. Tm3 +: Ho3 + Fiber input, midpoint and output of the dynamic characteristics of a theoretical study. The results show that the optical fiber has different absorption power to the pump at different positions. The start and the duration of relaxation oscillation of the number of particles and the laser power in the optical fiber show a big difference, and the peak value of the signal light oscillation is much larger than that at the steady state Power; The system’s light - light conversion efficiency of 56%.