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对掺铒光纤激光器的时域瞬态特性进行了理论与实验研究。理论模型从激光器的基本速率方程出发,通过求解增益光纤中的功率传输方程,得到激光器的时域输出结果。数值模拟了脉冲泵浦注入后激光器的瞬态特性,分析了激光器时域输出特性随泵浦功率及腔内损耗的变化规律。实验中采用上下沿功率均可调的方波泵浦掺铒光纤,通过可变光衰减器调解腔内损耗,观察激光器驰豫振荡特性,研究了激光建立的延迟时间与泵浦功率及腔损耗的关系。数值模拟与实验结果一致。
The time-domain transient characteristics of erbium-doped fiber lasers are studied theoretically and experimentally. The theoretical model starts from the basic rate equation of the laser and obtains the time-domain output of the laser by solving the power transfer equation in the gain fiber. The transient characteristics of the laser after pulsed pumping are numerically simulated. The variation of laser output characteristics in time domain with pump power and cavity loss is analyzed. In the experiment, a square-wave pump erbium-doped fiber with adjustable power is used, the cavity loss is controlled by a variable optical attenuator, and the relaxation oscillation characteristics of the laser are observed. The delay time, pump power and cavity loss Relationship. The numerical simulation is consistent with the experimental results.