Abstract

Efficient operation of diode-pumped single-frequency fiber lasers at wavelengths from 1740 to 2017nm 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 1893nm, the single-frequency fiber laser has a pump threshold of 30mW, a slope efficiency of 35%, and maximum output power of 50mW with respect to the launched power of single-mode pump diodes at 805nm. To the best of our knowledge, this is the highest lasing efficiency achieved in single-frequency fiber lasers operating near 2μm. Frequency noise of the single-frequency fiber laser at 1893nm has been characterized and compared with that of single-frequency fiber lasers at 1 and 1.55μm.

© 2007 Optical Society of America

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