Abstract

We report the demonstration of a ${\mathrm{Dy}}^{3+}$-doped ZBLAN fiber laser directly diode-pumped at 800 nm utilizing a codoping scheme with ${\mathrm{Tm}}^{3+}$ serving as the donor ion. In this initial demonstration, a modest output power of 12 mW is generated with a slope efficiency of 0.3% at an emission wavelength of 3.23 μm. Energy transfer dynamics are investigated through excited state lifetime analysis and comparison to resonant pumping of the ${\mathrm{Dy}}^{3+}$ upper state. The likely presence of an energy transfer upconversion process is identified, which has an undesirable effect on 3 μm class lasers but may be of significant benefit for future 4 μm systems.

© 2019 Optical Society of America

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