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

Sun Jun-Yi, Xiao Qi-Rong, Li Dan, Wang Xue-Jiao, Zhang Hai-Tao, Gong Ma-Li, Yan Ping^†,

Unstable patterns in Yb-doped DCF with laser intensity being 438 MW/cm². (a) Dot-shaped track; (b) line-shaped track; (c) distorted bullet shaped track; (d) indiscrete damage track.