Abstract

Theoretical analyses show that the use of high-numerical-aperture (NA) fibers can significantly increase the conversion efficiency of a blue ${\mathrm{Pr}}^{3+}$-doped fluoride fiber upconversion laser and reduce the pump-power threshold. A record high efficiency of $\sim 14\%$ and a low 1017-nm threshold of $\sim 30 \mathrm{mW}$ were achieved experimentally with a fiber with a NA of $\sim 0.39$.

© 1998 Optical Society of America

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