Abstract

Holmium (${\mathrm{Ho}}^{3+}$)-doped fluorotellurite microstructured fibers based on ${\mathrm{TeO}}_2–{\mathrm{BaF}}_2–{\mathrm{Y}}_2{\mathrm{O}}_3$ glasses are fabricated by using a rod-in-tube method. By using a 1.992 μm fiber laser as the pump source, lasing at 2.077 μm is obtained from a 27 cm long ${\mathrm{Ho}}^{3+}$-doped fluorotellurite microstructured fiber. The maximum unsaturated power is about 161 mW and the corresponding slope efficiency is up to 67.4%. The influence of fiber length on lasing at 2.1 μm is also investigated. Our results show that ${\mathrm{Ho}}^{3+}$-doped fluorotellurite microstructured fibers are promising gain media for 2.1 μm laser applications.

© 2015 Optical Society of America

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