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由稳态条件下描述光纤中受激拉曼散射(SRS)效应的光功率耦合方程出发,采用解析方法对多阶级联拉曼光纤激光器(CRFLs)进行了理论分析。根据拉曼光纤激光器级联阶数的奇偶性分别推导出了多阶级联拉曼光纤激光器的输出功率、光-光转换效率最大时的拉曼光纤长度和输出耦合器反射率。通过忽略反射回谐振腔输入端的剩余抽运光功率,计算了5阶级联拉曼光纤激光器的输出特性和光-光转换效率随光纤长度和输出耦合器反射率的变化。利用已有的5阶级联掺锗拉曼光纤激光器输出特性实验数据与理论分析结果进行了对比。
Based on the optical power coupling equation describing the stimulated Raman scattering (SRS) effect in fiber under steady-state conditions, a theoretical analysis of the multi-order cascaded Raman fiber lasers (CRFLs) is made. The output power of multi-order cascaded Raman fiber laser, the Raman fiber length and the output coupler reflectivity of the multi-order cascaded Raman fiber laser are deduced according to the parity of Raman fiber laser cascade. By neglecting the residual pump power reflected back to the input of the resonator, the output characteristics and the optical-optical conversion efficiency of the fifth-order cascaded Raman fiber lasers with the fiber length and the output coupler reflectivity were calculated. The experimental results of the output characteristics of the existing 5-order cascaded Raman fiber laser are compared with those of the theoretical analysis.