Abstract

A new, highly efficient and power scalable pump scheme for 3 μm class fiber lasers is presented. Using the free-running 2.8 μm emission from an ${\mathrm{Er}}^{3+}$-doped fluoride fiber laser to directly excite the upper laser level of the ${}^6{\mathrm{H}}_{13/2}\to {}^6{\mathrm{H}}_{15/2}$ transition of the ${\mathrm{Dy}}^{3+}$ ion, output at 3.04 μm was produced with a record slope efficiency of 51%. Using comparatively long lengths of ${\mathrm{Dy}}^{3+}$-doped fluoride fiber, a maximum emission wavelength of 3.26 μm was measured.

© 2016 Optical Society of America

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