Abstract
We report, for the first time to the best of our knowledge, a watt level cw fiber laser at from a piece of 40-cm-long newly developed highly thulium-doped () tungsten tellurite glass double cladding fiber pumped by a commercial laser diode. The maximum output power of the fiber laser reaches . The slope efficiency and the optical–optical efficiency with respect to the absorbed pump are 20% and 16%, respectively. The lasing threshold is , and the lasing wavelength is centered at .
© 2010 Optical Society of America
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