Functional Yb-doped fiber with a bat-type refractive index distribution for beyond kilowatt all-fiber single-frequency laser amplification by Wei Li, Wei Liu, Yu Deng, Yisha Chen, Huan Yang, Qi Chen, Junjie Zheng, Hu Xiao, Zilun Chen, Zhiyong Pan, Pengfei Ma, Zefeng Wang, Lei Si, Shanhui Xu, Jinbao Chen

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