国产两万瓦级同带泵浦掺镱双包层光纤  

Homemade 20 kW Yb-Doped Double-Cladding Fiber for Tandem Pumping

作　　者：衣永青[1] 刘君 沈一泽 李峰云 韩志辉[1] 杨鹏[1] 庞璐[1] 林宏奂[2] 王建军[2] Yi Yongqing;Liu Jun;Shen Yize;Li Fengyun;Han Zhihui;Yang Peng;Pang Lu;Lin Honghuan;Wang Jianjun(The 46th Research Institute,China Electronics Technology Group Corporation,Tianjin 300220,China;Laser Fusion Research Center,China Academy of Engineering Physics,Mianyang,Sichuan 621900,China)

机构地区：[1]中国电子科技集团公司第四十六研究所,天津300220 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《中国激光》2022年第7期91-96,共6页Chinese Journal of Lasers

摘　　要：同带泵浦是目前实现高功率光纤激光器的主要技术之一。报道了一种自主研制的同带泵浦掺镱双包层光纤,采用改进的化学气相沉积工艺结合液相掺杂工艺,通过纤芯组分设计和制棒工艺优化,提高了高掺杂光纤纤芯折射率的均匀性。基于所研制的47μm/400μm光纤搭建了全光纤化主振荡功率放大器,采用同带泵浦方式,实现了高受激拉曼散射(SRS)抑制比的20.88 k W激光输出,中心波长为1080 nm,斜率效率为82.7%。这是目前国产光纤以同带泵浦方式实现的最高功率。Objective With the development of Yb-doped fiber lasers,the output power of a single domestic fiber has reachedthe 10 k Wlevel.With the increase of laser output power,the thermal effect problem of traditional direct pumping isdifficult to be solved effectively.Owing to the low quantum deficit and high brightness,the tandem pumpingemploying Yb-doped fiber lasers as the pumping source can effectively reduce this thermal issue and achieve a highoutput power,which is an important trend in the research of high-power fiber laser amplification.Because of themuch lower absorption coefficient at 1018 nm than that at 976 nm,the tandem pumping configuration needs a longergain fiber to sufficiently absorb pump light,which in turn induces a severer nonlinear effect,bringing in morechallenges in fiber lasers.In 2018,the Department of Precision Instruments of Tsinghua University reported the useof a domestic gain fiber produced by China Electronics Technology Croup Corporation No.46 Research Institute toachieve a 3000 W laser output based on tandem pumping.In May 2021,the China Academy of Engineering Physics(CAEP)used the homemade Yb-doped active fiber to realize the laser output of 20 k Wb y using the tandem pumpingmethod.To achieve a higher output-power,here a highly Yb-doped double-cladding fiber is proposed used for tandempumping.Methods The Yb-doped double-cladding fiber preform is prepared by the improved chemical vapor deposition(MCVD)method combined with the solution doping technique.Based on the existing technology,the key process is improved and optimized.Through the design of fiber core components and the optimization of the multi-layer deposition technology,the doping concentration and the uniform distribution of Yb ions are improved.The background loss of an Yb-doped fiber under high doping concentration is effectively reduced.The refractive index distribution of the improved fiber is shown in Fig.3,and the doped element distribution in the improved fiber core is shown in Fig.4.Results and Discussions The cross sec

关 键 词：光纤光学 掺镱双包层光纤 气相/液相掺杂工艺 同带泵浦 

分 类 号：TN244[电子电信—物理电子学]