高功率窄线宽光纤激光器研究进展

Progress in High-Power Narrow-Linewidth Fiber Lasers

高功率窄线宽光纤激光器在地球科学、光束合成、非线性频率转换等领域有重要的应用价值,近几年已经成为激光领域的研究热点。受激布里渊散射(SBS)、自相位调制(SPM)、四波混频(FWM)等非线性效应限制了窄线宽光纤激光器输出功率的提升。随着各种非线性效应抑制技术的发展,窄线宽光纤激光器的输出功率也得到了大幅提升,目前已经达到了千瓦量级。对1μm波段高功率窄线宽光纤激光器的研究进行了详细的介绍,重点介绍了限制窄线宽激光器功率提升的非线性效应及其抑制方法、高功率窄线宽光纤激光器的种子源技术以及国内外典型的高功率窄线宽光纤激光器的研究成果。

Narrow linewidth fiber lasers have gained extensive attention as their important applications in geoscience,nonlinear frequency conversion,and beam combining.Unfortunately,the output power of narrow linewidth fiber lasers is limited by nonlinear effects such as stimulated Brillouin scattering（SBS）,self-phase modulation（SPM）,and four wave mixing（FWM）.Lots of methods have been proposed to suppress the nonlinear effects,which boost the output power of narrow linewidth fiber lasers up to kW level.In this paper,we give an overview of the research on high power narrow linewidth fiber lasers at the wavelength of 1μm.The nonlinear effects and corresponding suppressing methods are introduced,as well as the recent progress and key factors of high power narrow linewidth fiber lasers.