Laser emission in the range of from a -doped tellurite fiber is demonstrated when pumped with a diode-pumped -doped silica fiber laser operating at . This pump source excites the ions directly into the upper laser level and yields an output power of with a slope efficiency of 76% in a 99%–12% laser cavity arrangement and a long fiber. This result is very close to the Stokes efficiency limit of . This is, to the authors’ knowledge, the first demonstration of high efficiency lasing in a tellurite fiber at wavelengths longer than .
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