Abstract

A heterogeneous fiber with a ${\mathrm{Yb}}^{3+}$-doped fluorophosphate core and phosphate cladding was fabricated by the rod-in-tube and stacking technique. The concentration of ${\mathrm{Yb}}^{3+}$ in the core glass can be up to $6\times {10}^{20}\mathrm{ions}/{\mathrm{cm}}^3$. The lasing threshold was 900 mW, and the lasing wavelength was centered at 1043 nm. A single-mode laser output with a slope efficiency of 13.6% with respect to the absorbed pump power was obtained, for the first time to our knowledge. The beam quality factor (${\mathrm{M}}^2$) was measured to be 1.25. Thus, a fluorophosphate glass fiber is a good alternative for a gain medium in a short-linear-cavity single-frequency fiber laser.

© 2016 Optical Society of America

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