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Higher Education Press

graphical abstract

Caption

(a) Energy level diagram and some important transitions of 3.5 μm Er-doped fluoride fiber laser. (b) Experimental setup of the 3.5 μm Er-doped fluoride fiber laser. (c) Intense fluorescence at high pump power.

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Lu Zhang, Shijie Fu, Quan Sheng, Xuewen Luo, Junxiang Zhang, Wei Shi, Jianquan Yao

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