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结合光纤干涉环原理和受激布里渊散射效应数值求解描述双包层掺镱光纤激光器的速率方程,得到构建光纤干涉环的耦合器耦合率及泵浦功率与输出脉冲重频的关系;进一步采用掺镱双包层光纤激光器中光子数守恒的半数值模型得到耦合器耦合率、泵浦功率与输出平均功率、脉冲能量的关系。实验测试了不同泵浦功率对输出平均功率和脉冲能量的影响,实验结果与仿真结果吻合。研究表明:提高泵浦功率只能提高脉冲重复频率和平均功率,并不能提高脉冲能量;选择合适耦合率的耦合器构建光纤干涉环才能获得较高脉冲能量;泵浦功率较高时会激发二阶斯托克斯光脉冲。
Based on the principle of fiber interference ring and the stimulated Brillouin scattering effect, the rate equations of double-clad ytterbium-doped fiber lasers are numerically solved to obtain the coupling coupling ratio and the relationship between pump power and output pulse repetition rate. The relationship between coupler coupling rate, pump power, output average power and pulse energy was obtained by using a half-value model of photon conservation in the Yb-doped double-clad fiber laser. The effects of pump power on output average power and pulse energy were experimentally tested. The experimental results are in good agreement with the simulation results. The research shows that increasing the pump power can only increase the pulse repetition frequency and average power, and can not increase the pulse energy. Choosing the coupler with the proper coupling ratio to construct the fiber interference ring can obtain higher pulse energy. When the pumping power is higher, Stokes light pulse.