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Efficient 2 μ m Tm 3 + -doped tellurite fiber laser

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Abstract

Laser emission in the range of 1.881.99μm from a Tm3+-doped tellurite fiber is demonstrated when pumped with a diode-pumped Er3+Yb3+-doped silica fiber laser operating at 1.571.61μm. This pump source excites the Tm3+ ions directly into the F43 upper laser level and yields an output power of 280mW with a slope efficiency of 76% in a 99%–12% laser cavity arrangement and a 32cm long fiber. This result is very close to the Stokes efficiency limit of 80%. This is, to the authors’ knowledge, the first demonstration of high efficiency lasing in a tellurite fiber at wavelengths longer than 1.56μm.

© 2008 Optical Society of America

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