Abstract

Efficient operation of diode-pumped single-frequency fiber lasers at wavelengths from 1740 to $2017\mathrm{nm}$ has been demonstrated by using a very short piece of newly developed single-mode active fiber, i.e., heavily thulium-doped germanate glass fiber. At $1893\mathrm{nm}$, the single-frequency fiber laser has a pump threshold of $30\mathrm{mW}$, a slope efficiency of 35%, and maximum output power of $50\mathrm{mW}$ with respect to the launched power of single-mode pump diodes at $805\mathrm{nm}$. To the best of our knowledge, this is the highest lasing efficiency achieved in single-frequency fiber lasers operating near $2\mathrm{\mu }\mathrm{m}$. Frequency noise of the single-frequency fiber laser at $1893\mathrm{nm}$ has been characterized and compared with that of single-frequency fiber lasers at 1 and $1.55\mathrm{\mu }\mathrm{m}$.

© 2007 Optical Society of America

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