高功率双包层光纤激光器的受激拉曼散射

Stimulated Raman Scattering in High Power Double Clad Fiber Laser

受激拉曼散射(SRS)会限制光纤激光器功率的提高。利用光纤激光器的功率传输方程,理论分析了高功率掺Yb3+双包层光纤激光器中的受激拉曼散射效应,得到了纤芯直径、光纤长度、掺杂浓度以及抽运方式对光纤激光器特性的影响。通过分析,得到了增大纤芯直径、减小光纤长度、降低掺杂浓度以及合理的抽运方式可以有效地减小拉曼散射的影响。利用已有的实验结果对理论模型进行了对比,证明了理论模型的正确性。所得的结果对设计实现高功率双包层光纤激光器提供了理论依据。

Stimulated Raman scattering （SRS） can affect the power scaling of high power fiber laser. According to the power transfer equations, SRS effect in high power Yb^3＋ doped double clad fiber laser is studied. The effect of core diameter, fiber length, doped concentration and pumping method on the characteristic of fiber laser is studied. The way for suppressing SRS, such as increasing core diameter, decreasing fiber length, reducing doped concentration and using reasonable pumping method, is discussed. The theoretical model is proved by the experimental result.