Abstract

In this Letter, we report for the first time, to the best of our knowledge, on an emission at 8 μm from ${\mathrm{Tb}}^{3+}$-doped ${\mathrm{Ga}}_5{\mathrm{Ge}}_{20}{\mathrm{Sb}}_{10}{\mathrm{Se}}_{65}$ chalcogenide fibers with doping levels at 1000 ppm and 500 ppm. These fibers were drawn following conventional melt-quenching methods and pumped at 2.05 μm using a ${\mathrm{Tm}}^{3+}$: YAG laser. The spectroscopic properties of the emitting ${}^7{\mathrm{F}}_4$ manifold are investigated to rule out any parasitic signal mimicking the real ${\mathrm{Tb}}^{3+}$ 8 μm emission. Time-resolved spectroscopic experiments are presented to build a comprehensive study of this 8 μm fluorescence recorded with a clear signal-to-noise ratio.

© 2018 Optical Society of America

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