We report on the first diode-pumped laser operation of thulium-doped ${\mathrm{Lu}}_2{\mathrm{O}}_3$ . With a very compact setup an output power of $75\mathrm{W}$ and slope efficiencies of around 40% with respect to the incident pump power were achieved at room temperature. Free running laser operation was observed at wavelengths of $2065\mathrm{nm}$ and $1965\mathrm{nm}$ . With a birefringent filter the wavelength could continuously be tuned from $1922\mathrm{nm}$ to $2134\mathrm{nm}$ . The thermal conductivity of $\mathrm{Tm}\text{:}{\mathrm{Lu}}_2{\mathrm{O}}_3$ was measured for different dopant concentrations and is compared to the one of thulium-doped YAG.

© 2011 Optical Society of America

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