Fiber fuse behavior in kW-level continuous-wave double-clad field laser  

作　　者：孙骏逸 肖起榕 李丹 王雪娇 张海涛 巩马理 闫平 

机构地区：[1]Center for Photonics and Eleconics,Department of Precision Instrument,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Physics B》2016年第1期600-603,共4页中国物理B（英文版）

基　　金：supported by the Key Laboratory of Science and Technology on High Energy Laser and China Academy of Engineering Physics(Grant No.2014HEL02);the National Natural Science Foundation of China(Grant No.61307057)

摘　　要：In this study, original experimental data for fiber fuse in kW-level continuous-wave （CW） high power double-clad fiber （DCF） laser are reported. The propagating velocity of the fuse is 9.68 m/s in a 3.1-kW Yb-doped DCF laser. Three other cases in Yb-doped DCF are also observed. We think that the ignition of fiber fuse is caused by thermal mechanism, and the formation of bullet-shaped tracks is attributed to the optical discharge and temperature gradient. The inducements of initial fuse and formation of bullet-shaped voids are analyzed. This investigation of fiber fuse helps better understand the fiber fuse behavior, in order to avoid the catastrophic destruction caused by fiber fuse in high power fiber laser.In this study, original experimental data for fiber fuse in kW-level continuous-wave （CW） high power double-clad fiber （DCF） laser are reported. The propagating velocity of the fuse is 9.68 m/s in a 3.1-kW Yb-doped DCF laser. Three other cases in Yb-doped DCF are also observed. We think that the ignition of fiber fuse is caused by thermal mechanism, and the formation of bullet-shaped tracks is attributed to the optical discharge and temperature gradient. The inducements of initial fuse and formation of bullet-shaped voids are analyzed. This investigation of fiber fuse helps better understand the fiber fuse behavior, in order to avoid the catastrophic destruction caused by fiber fuse in high power fiber laser.

关 键 词：fiber lasers high power lasers laser damage 

分 类 号：TN248[电子电信—物理电子学]