Mid IR Fiber Lasers based on Rare Earth Ions doped Chalcogenide Glasses

We demonstrate chalcogenide glass fiber lasers emitting at $4.6-5.4 \mu \mathrm{m}$. The fibers had $\boldsymbol{\emptyset} 20 \mu \mathrm{m}$ selenide core with of $\mathbf{T b}^{3+}$ or $\mathrm{Ce}^{3+}$ doping and undoped $\boldsymbol{\varrho} 240-250 ~ \mu \mathrm{m}$ sulfide cladding. The 200 and 7 mW output power with 8 and $17 \%$ slope efficiency was obtained for $\mathrm{Tb}^{3+}$ - and $\mathrm{Ce}^{3+}$-doped fibers respectively.