多波长与横模可切换掺镱光纤激光器的研究  

Multi-wavelength and Transverse-mode-switchable Yb-doped Fiber Laser

作　　者：彭剑傲 陈伟[1,2] 侯超奇[3] 刘丹丹 庞拂飞[1,2] 黄素娟[1,2] 王廷云[1,2] PENG Jianao;CHEN Wei;HOU Chaoqi;LIU Dandan;PANG Fufei;HUANG Sujuan;WANG Tingyun(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China;Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,Shanghai University,Shanghai 200444,China;Xi′an Institute of Optics and Precision Mechanics of CAS,Xi′an 710119,China)

机构地区：[1]上海大学特种光纤与光接入网重点实验室,上海200444 [2]上海大学特种光纤与先进通信国际合作联合实验室,上海200444 [3]中国科学院西安光学精密机械研究所,西安710119

出　　处：《光子学报》2024年第8期140-147,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.62275148,U2241237);江苏省产业前瞻与关键核心技术-重点项目(No.BE2022055-4);中国船舶航海保障技术实验室开放基金项目(No.2023010102);111计划(No.D20031)。

摘　　要：设计并制备了一种具有环形掺镱纤芯的光纤波导结构,并提出了一种基于该环芯掺镱光纤和少模光纤布拉格光栅的多波长与横模可切换光纤激光器。在这种光纤激光器中,只需简单调整腔内的偏振控制器,就可以实现单波长和双波长的激光稳定振荡。当激光器在单波长下工作时,可以切换两种横模输出,包括LP01模和LP11模,两种模式都获得了小于0.08 nm的3 dB窄线宽和大于45 dB的高边模抑制比,中心波长和光强的波动分别为±0.01 nm和±1 dB。试验表明:该环芯掺镱光纤有助于LP11模获得的增益高于LP01模,LP01模式激光的斜率效率为34.34%,而LP11模式激光的斜率效率高达49.09%。该光纤激光器可以在模分复用系统和激光加工等领域发挥重要的作用。Multi-wavelength lasers and transverse-mode-switchable lasers are expected to find applications in Wavelength Division Multiplexing(WDM)and Mode Division Multiplexing(MDM)systems.High-order transverse modes play a crucial role in the generation of cylindrical vector beams and vortex beams,making them suitable for applications such as micro-particle manipulation,quantum information,and laser material processing.While in solid-state lasers,specific transverse modes can be excited through phase and amplitude modulation,the entire laser system is relatively underdeveloped,with limited mode scalability.Therefore,the all-fiber structure of multi-wavelength and transverse-mode-switchable fiber lasers has sparked significant interest among scientists.Various technological approaches have been proposed to achieve multi-wavelength or transverse mode outputs from fiber lasers.However,there has been limited reporting on fiber lasers capable of simultaneously operating at multiple wavelengths while generating switchable transverse modes.Reported multi-wavelength and transverse mode-switchable fiber lasers often employ gain media consisting of traditional doped fibers,where the competitive advantage of the fundamental mode within the resonant cavity is significantly greater than that of higher-order modes.Consequently,these fiber lasers struggle to maintain stable and efficient output of higher-order modes.In this study,a Ring-Core Yb-Doped Fiber(RCYDF)was designed and fabricated.The unique structure of the ring-shaped doping region aligns well with the dual-peak spatial electromagnetic field distribution of the LP11 mode,prioritizing the gain acquisition for the LP11 mode within the gain fiber.This design facilitates stable oscillation and efficient output of the LP11 mode laser.Few-Mode Fiber Bragg Gratings(FMFBGs)serve not only as ideal wavelength-selective elements but also as components for achieving transverse mode switching.U tilizing a pair of FMFBGs as the laser resonant cavity and the fabricated RCYDF as the laser ga

关 键 词：光纤激光器 多波长 横模可切换 环芯掺镱光纤 少模光纤光栅 

分 类 号：TN248.1[电子电信—物理电子学]