Abstract
Efficient operation of diode-pumped single-frequency fiber lasers at wavelengths from 1740 to 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 , the single-frequency fiber laser has a pump threshold of , a slope efficiency of 35%, and maximum output power of with respect to the launched power of single-mode pump diodes at . To the best of our knowledge, this is the highest lasing efficiency achieved in single-frequency fiber lasers operating near . Frequency noise of the single-frequency fiber laser at has been characterized and compared with that of single-frequency fiber lasers at 1 and .
© 2007 Optical Society of America
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