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Er3+‐doped fiber lasers operating at 2.7 μm have attracted increasing interest because of their various important applications; however, the intrinsic self‐terminating effect of Er3+ and the reliability of glass hosts hindered the development of Er3+‐doped fiber lasers. Herein, the glass‐forming regions of a series TeO2–Ga2O3–R2O (or MO) (R = Li, Na, and Rb; M = Mg, Sr, Ba, Pb, and Zn) glasses are...
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