掺镱大模场光子晶体光纤研究进展(特邀)  

Research Progress on Yb-Doped Large Mode Field Photonic Crystal Fibers(Invited)

作　　者：胡丽丽[1] 冯素雅[1] 王孟[1] 王世凯[1] 王璠[1] 郭梦婷 于春雷[1] 陈丹平[1] Hu Lili;Feng Suya;Wang Meng;Wang Shikai;Wang Fan;Guo Mengting;Yu Chunlei;Chen Danping(Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800

出　　处：《中国激光》2024年第1期280-294,共15页Chinese Journal of Lasers

基　　金：JPPT项目;中俄国际合作项目(20XH1217);山东省重点研发专项(2021CXGC010202)。

摘　　要：掺镱大模场光子晶体光纤在高峰值功率超快激光放大器中有着重要的应用价值,其研究得到了广泛关注。首先简要介绍了国内外掺镱大模场光子晶体光纤的研究进展,阐述了掺镱大模场光子晶体光纤的基本设计思路,对比说明了保偏型掺镱光子晶体光纤的设计制备方法。重点介绍了近十年来中国科学院上海光学精密机械研究所在掺镱大模场光子晶体光纤方面的研究进展。包括掺镱大模场光子晶体光纤的纤芯折射率大小和均匀性控制、光子晶体光纤微结构控制等关键技术。采用自主研制的四种芯径为40~100μm的掺镱大模场光子晶体光纤开展了皮秒脉冲激光放大实验。利用40μm芯径的保偏掺镱光子晶体光纤实现了平均功率为100 W、光束质量因子(M2)小于1.4的稳定输出,偏振消光比为12 dB。利用100μm芯径的保偏掺镱大模场光子晶体光纤实现了M2小于1.5的高光束质量脉冲放大。上述研究为掺镱大模场光子晶体光纤的国产化应用奠定了基础。Significance Ytterbium-doped large-mode-area photonic crystal fibers(LMA PCFs)have attracted extensive attention owing to their important applications in high-peak-power ultrafast laser amplifiers.Fiber lasers are widely used in advanced manufacturing,medicine,national defense,and scientific research owing to their compact structure,high conversion efficiency,high reliability,and low cost.However,with the development of fiber lasers,particularly the development and application of ultrafast lasers in the field of fine processing in recent years,higher requirements have been placed on the output power and beam quality of fiber lasers.Currently,the output power of internationally commercialized fiber lasers has reached 100 kW.IPG Photonics Corporation uses a double-clad fiber with a core diameter of 30μm to achieve a 10 kW single-mode single-fiber laser output.However,owing to the limitations of the physical mechanisms,such as nonlinear effects,optical damage,and thermal damage,it is very difficult to further increase the output power of a single laser module.The nonlinear effect of the optical fiber is related to the mode field area of the optical fiber.The larger the mode field area,the weaker the nonlinear effect of the optical fiber,and the higher the threshold of the nonlinear effect.Therefore,large-mode field fibers are one of the most direct and effective ways of overcoming nonlinear effects and fiber laser damage to further increase laser power.However,an increase in the core diameter of large-mode field fibers inevitably causes competition among multiple transverse modes,degrading the beam quality of the laser.Consequently,various fiber structure designs have been proposed to maintain a satisfactory beam quality with large core diameters,such as rod-type photonic crystal fibers,photonic bandgap fibers,leakage channel fibers,large-pitch fibers,chirally coupled-core fibers,and other microstructure fibers.Among them,the Yb-doped PCF has the most classic architecture,with an ordered array of microscopic air ho

关 键 词：光纤光学 掺镱石英玻璃 大模场光子晶体光纤 皮秒脉冲激光放大 光纤激光 

分 类 号：TN244[电子电信—物理电子学]