同带泵浦的万瓦级三包层掺镱光纤  

Yb-Doped Triple-Clad Fiber for Nearly 10 kW Level Tandem-Pumped Output

作　　者：张磊[1] 楼风光 王孟[1] 于春雷[1,3] 胡丽丽 肖起榕[2] 李丹 闫平[2] 巩马理[2] Zhang Lei;Lou Fengguang;Wang Meng;Yu Chunlei;Hu Lili;Xiao Qirong;Li Dan;Yan Ping;Gong Mali(Key Laboratory of Materials for High Power Laser,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Department of Precision Instruments,Tsinghua University,Beijing 100084,China;Hangzhou Institute for Advanced Study,UCAS,Hangzhou,Zhejiang 310024,China)

机构地区：[1]中国科学院上海光学精密机械研究所强激光材料重点实验室,上海201800 [2]清华大学精密仪器系,北京100084 [3]国科大杭州高等研究院,浙江杭州310024

出　　处：《中国激光》2021年第13期203-206,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(61775224)。

摘　　要：同带泵浦是提升单纤输出能力的有效手段。在传统双包层光纤研究的基础上,为了进一步提高涂覆层的耐受性,本课题组制备了适用于同带泵浦的三包层大模场掺镱光纤,使大部分泵浦光束缚在含氟石英层内传输,大大减轻了泵浦光对低折射率涂层的冲击。基于所研制的三包层光纤搭建了全光纤化主控振荡功率放大器,实现了9010 W激光输出,激光中心波长为1080 nm,斜率效率为80.5%。三包层光纤的使用对万瓦级以上高功率激光光纤的长期可靠运行具有重要意义。Objective Since the development of Yb-doped fiber laser, increasing the output of a single fiber has been one of the most important directions. The output of a single fiber has now been able to attain 10 kW-level or above. However, these results are mainly laboratory reports, and few fibers have been adopted in practical applications because the coating material of these double cladding fibers age quickly due to the injected high pump power and large amount of quantum defect heating. To minimize the impact of high pump power on coating materials, triple-clad Yb-doped fibers, with an addition of fluorine-doped fused silica between silica and low-index coating, have been suggested. For a given fiber, high brightness of the tandem-pumping can not only reduce the quantum defect heating, but also further increase the pump injection and output-power scaling. To achieve a more reliable and higher laser output, a highly Yb-doped triple-clad fiber used for tandem-pumping is proposed.Methods The Yb-doped fiber preform has been prepared by modified chemical vapor deposition(MCVD)in combination with sol-gel solution-doping method to improve the Yb-doped concentration without clusters.The doped preform was overcladded and shaped via grinding in an octagonal shape to form the pump cladding.The preform was further surrounded by the second highly fluorine-doped synthetic fused silica cladding with a depressed refractive index to form the out cladding.Then,the preform was drawn and coated as conventional double cladding fiber to obtain the triple-clad fiber(Fig.1).The fiber was characterized by refractive index profiling,electron probe microanalysis(EPMA),loss,and absorption.Finally,the fiber laser performance was characterized.Results and Discussions The fiber is 50/350/400μm core-clad diameter,0.06/0.22/0.46 NA,and approximately0.6 dB/m inner cladding absorption at 1018 nm.The EPMA results showed that the homemade triple-clad fiber has a much higher Yb-doped concentration than the commonly used 20/400μm double cladding fiber(

关 键 词：光纤光学 掺镱光纤 三包层光纤 同带泵浦 主振荡功率放大器 

分 类 号：TN244[电子电信—物理电子学]