研究了连续波高功率掺镱双包层光纤放大器中, 信号光和放大自发辐射光的变化规律, 模拟了信号光和抽运光功率、抽运方式以及增益光纤长度对输出功率的影响。搭建了光纤放大器系统, 在信号光为2 W, 抽运光为72.9 W时, 得到了48.2 W的放大激光。数值模拟和实验结果吻合得较好, 模拟计算为连续波高功率双包层光纤放大器的优化设计提供了理论依据。

The power distributions of signal and amplified spontaneous emission in continuous- wave high-power ytterbium-doped double-clad fiber amplifier are studied. The relationships between the output power and the signal power, pump power, pump schemes, fiber length are studied. The system of ytterbium-doped double-clad fiber amplifier is set up and amplified laser of 48.2 W is obtained when the powers of signal and pump are 2 W and 72.9 W, respectively. The resoults of theoretical study and experiment are in good agreement. And the results of numerical simulation provide a theoretical guide to optimal design of continuous-wave high-power double-clad fiber amplifier.