摘要
高功率掺镱光纤激光器在精密加工、国防、科研等领域有重要的应用价值,然而随着功率的提升,光纤内部的非线性效应开始凸显.在此,详细分析了受激布里渊散射(SBS)、受激拉曼散射(SRS)、非线性折射率、横模不稳定(TMI)等非线性效应的产生过程,并提出抑制方法.另外,从光纤振荡器和主振荡功率放大器两个角度,简述了近几年学者们在抑制非线性效应基础上不断提升掺镱光纤激光器输出功率的研究进展.目前,全光纤结构的掺镱振荡器输出功率达到8kW;单纤主振荡功率放大器激光系统输出功率已突破20kW.
Abstract
High-power ytterbium-doped fiber lasers have important application value in precision processing,national defense,scientific research and other fields,but with the increase of power,the nonlinear effects inside the fiber begins to become prominent.Here,the generation process of nonlinear effects such as stimulated Brillouin scattering(SBS),stim-ulated Raman scattering(SRS),nonlinear refractive index,and transverse mode instability(TMI)is analyzed in detail,and suppression methods are proposed.In addition,from the perspectives of fiber oscillator and main oscillation power amplifier,the research progress of scholars in recent years on the basis of suppressing nonlinear effects to continuously improve the output power of ytterbium fiber lasers is briefly described.At present,the output power of the ytterbium-doped oscillator with all-fiber structure reaches 8kW;The output power of the single-fiber main oscillation power ampli-fier laser system has exceeded 20kW.
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