Abstract

We report on an efficient mid-infrared thulium (Tm) fiber laser operating on the $^3{{\rm H}_4} \to {^3{\rm H}_5}$ transition and featuring an upconversion pumping scheme. This laser comprises a heavily ${{\rm Tm}^{3 +}}$-doped (2.50 mol. %) zirconium fluoride glass fiber pumped by a tunable Yb fiber laser around 1.05 µm corresponding to the $^3{{\rm F}_4}\to{^3{\rm F}_{2,3}}$ excited-state absorption transition. The laser generates 1.24 W at 2269–2282 nm with a slope efficiency of 37% in the quasi-continuous-wave regime. The Tm-glass fiber exhibits a broadband ${^3{\rm H}_4}\; \to{^3{\rm H}_5}$ emission with a bandwidth of 173 nm, making it very promising for femtosecond fiber oscillators at ${\sim}{2.3}\;\unicode{x00B5}{\rm m}$.

© 2020 Optical Society of America

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