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考虑拉曼光纤纤芯有效面积随 Stokes 光波长变化,提出了一种改进的 N 阶级联拉曼光纤激光器理论模型。根据该理论模型,按照拉曼光纤激光器级联阶数 N 的奇偶性分别推导出了第 N 阶 Stokes 光输出功率的解析表达式。通过忽略经输出耦合器反射回拉曼光纤输入端的残余泵浦光功率,计算了5阶级联拉曼光纤激光器的输出特性,并与相关文献上的实验数据进行了比较,结果显示文中的计算结果与实验结果相吻合。文中的理论模型对于设计 N 阶级联拉曼光纤激光器有一定指导意义。
Considering the change of the effective area of Raman fiber core with the wavelength of Stokes light, an improved theoretical model of cascaded Raman fiber lasers is proposed. According to the theoretical model, the analytical expression of the Stokes light output power of the Nth order is deduced according to the parity of the order N of the Raman fiber laser. By neglecting the residual pump power reflected back to the input of Raman fiber by the output coupler, the output characteristic of the fifth-order cascaded Raman fiber laser was calculated and compared with the experimental data in the literature. The results show that the calculation results And experimental results match. The theoretical model in this paper is of guiding significance for the design of N-order cascaded Raman fiber lasers.