Abstract

Fluoroindate glass fibers with an ${{\rm Er}^{3 +}}$ doping concentration of ${\sim}{0.5}\;{\rm mol}\%$ were fabricated by using a rod-in-tube method. Pumped by a 976 nm laser diode, intense emission at ${\sim}{3.3}\;\unicode{x00B5}{\rm m}$ was obtained from a 40 cm long ${{\rm Er}^{3 +}}$-doped fiber, which could be attributed to the transition ${^4{{\rm S}}_{3/2}}\to {^4{{\rm F}}_{9/2}}$ of ${{\rm Er}^{3 +}}$ ions. The calculated emission cross section at ${\sim}{3.3}\;\unicode{x00B5}{\rm m}$ was ${\sim}{3} \times {{10}^{- 26}}\;{{\rm m}^2}$, which was ${\sim}{1.5}$ times larger than that of transitions ${{\rm Er}^{3 +}}:{^4{{\rm F}}_{9/2}}\to {^4{{\rm I}}_{9/2}}$ and ${{\rm Dy}^{3 +}}:{^6{{\rm H}}_{13/2}}\to {^6{{\rm H}}_{15/2}}$. In addition, broad emissions ranging from 3.1 µm to 3.85 µm were obtained in the ${{\rm Er}^{3 +}}$-doped fiber under a 976 nm/1973 nm dual-wavelength pumping scheme. Our results indicated that ${{\rm Er}^{3 +}}$-doped fluoroindate glass fibers had the potential for constructing efficient ${\sim}{3.3}\;\unicode{x00B5}{\rm m}$ fiber lasers.

© 2021 Optical Society of America

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