掺镱双包层光纤放大器高功率脉冲放大特性

从放大器速率方程出发，分析了掺镱双包层光纤放大器的放大特性。模拟计算了无信号输入时放大器上能级粒子数、泵浦功率和放大自发辐射（ASE）在放大器中的稳态分布。分析了前向和后向泵浦时，高功率高斯脉冲放大时的脉冲波形畸变、上能级粒子数的时间特性、放大器存储能量和脉冲能量演化等动态特性。讨论了掺镱双包层光纤放大器输出脉冲能量随不同输入脉冲峰值功率和泵浦功率的关系。该模型和结论对高功率脉冲放大器的设计和优化具有一定的理论指导意义。

By solving a set of time-dependent equations, the characteristics of the ytterbium-doped double-clad fiber amplifier are presented. Besides the steady state in the fiber of the upper-state population, pump power and amplified spontaneous emission without the input signal, the dynamic characteristics of the high power Gaussian pulse amplification like the evolution of pulse waveform distortion, upper-state population distribution and stored energy and pulse energy of the amplifier under the forward and backward pump, are simulated. The relations between the output pulse energy of the amplifier and the different input pulse peak power or pump power are also discussed. The models and results can provide important guide for the design and optimization of the high power pulse amplification.