1.6 kW 8 GHz线宽线偏振窄线宽全光纤激光器  

1.6⁃kW 8⁃GHz Linearly⁃Polarized Narrow⁃Linewidth All⁃Fiber Laser

作　　者：许阳 房强 崔雪龙 赵一柱 丁香栋 许海鑫 陈鲁兵 侯博文 史伟[1,2] Xu Yang;Fang Qiang;Cui Xuelong;Zhao Yizhu;Ding Xiangdong;Xu Haixin;Chen Lubing;Hou Bowen;Shi Wei(School of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China;HFB Photonics Co.,Ltd.,Weihai 264209,Shandong,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]山东海富光子科技股份有限公司,山东威海264209

出　　处：《中国激光》2024年第13期79-86,共8页Chinese Journal of Lasers

基　　金：国家重点研发计划(2022YFB3606000,2022YFB4601805);山东省泰山产业领军人才项目(2020);山东省重点研发计划(2021CXGC010202,2020CXGC010104,2019JZZY020206)。

摘　　要：以白噪声调制的单频激光器作为种子源,基于主振荡功率放大结构搭建了1053 nm窄线宽光纤激光系统,该系统由一级种子源和三级放大器构成。在主放大器中对大模场保偏光纤进行合理的盘绕设计,通过结合976 nm全反向泵浦方式,成功地抑制了模式不稳定效应。最终实现了1053 nm的1.6 k W、8 GHz线偏振窄线宽激光输出,横向光束质量因子(M_(x)^(2))、纵向光束质量因子(M_(y)^(2))和偏振消光比分别为1.090、1.166和~14 d B。实验中未观测到明显的受激布里渊散射效应。Objective Polarization-maintaining ytterbium-doped fiber (PMYDF) lasers with smaller core diameters can suppress transverse mode instability (TMI) more effectively.However,reducing the core size also decreases the stimulated Brillouin scattering (SBS)threshold,which is a major challenge for narrow linewidth (<10 GHz) linear-polarized PMYDF lasers.To suppress SBS while still suppressing TMI,larger core fibers are a better choice.In this study,SBS is effectively suppressed in a 1.6-k W 8-GHz spectral width linear-polarized fiber laser,adopting gain fiber with 25-μm core diameter and a white-noise-broadened phase-modulated singlefrequency laser (PMSFL).In addition,TMI is effectively suppressed by careful application of the fiber-coiling method.The results indicate that 25-μm core diameter PMYDF has great application potential for high-power ultra-narrow linewidth (<10 GHz) linearpolarized fiber lasers.Methods The seed source used in this study is a white-noise-broadened PMSFL.The seed power is initially amplified from~20 m W to~20 W by a two-stage pre-amplifier,and then injected into a primary amplifier.The primary amplifier uses a 25-μm core diameter PMYDF with a gain-fiber length of~5.5 m,a mode field area of~340μm~2,and 976-nm pump light absorption of~2 d B/m.The design of the primary amplifier is based on a backward-pumping scheme,and six non-wavelength-stabilized 976-nm fiber-coupled semiconductor lasers (LDs) with a maximum output power of>400 W serve as the pumping sources.After amplification,the output laser beam is stripped by a cladding power stripper (CPS) to remove the cladding light,and then output through a fiber endcap.The total length of the output fiber is~1.5 m.Between the pre-and primary amplifiers,a high power fiber isolator (ISO) with a backward power monitoring port (TAP) is used to isolate and leak the backward light.A mode-field adapter (MFA) is inserted between the preand primary amplifiers to realize mode-field matching between different fibers.The laser system has an all-fiber structur

关 键 词：光纤激光器 线偏振 窄线宽 高功率 

分 类 号：TN248.1[电子电信—物理电子学]