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采用基于速率方程的离散算法,对双包层Er3+/Yb3+共掺光纤激光器增益介质在不同位置的动态特性进行了分析。研究了增益介质在不同位置上的能级粒子数、激光功率随时间的变化。结果表明:增益介质在不同位置振荡达到稳态前上能级粒子数随时间的变化是不同的,并呈现出了不同的变化特点;不同位置处振荡开始时的最大峰值功率与达到稳态时的功率也不同;不同位置开始振荡的时间相同,达到稳态的时间也基本相同。对这一算法的稳态结果同简化速率方程的稳态分析值进行了对比,显示了泵浦功率较大且光纤长度较长时两者所具有的差异。
The dynamic characteristics of the gain medium in double-clad Er3 + / Yb3 + codoped fiber lasers at different positions were analyzed by the discrete algorithm based on rate equation. The number of energy level particles in different positions of the gain medium and the variation of laser power with time are studied. The results show that when the gain medium oscillates at different positions and reaches the steady-state, the variation of the upper upper level particle number with time is different and shows different variation characteristics. The maximum peak power at the beginning of the oscillation at different positions reaches the steady state Of the power is also different; different locations start the same oscillation time to reach steady-state time is basically the same. The steady-state result of this algorithm is compared with the steady-state value of the simplified rate equation, which shows the difference between the two when the pump power is larger and the fiber length is longer.