Highly efficient Yb-doped silica fibers prepared by powder sinter technology

in: Optics Letters (2011)
Leich, Martin; Just, Florian; Langner, Andreas; Such, Mario; Schötz, Gerhard; Eschrich, Tina; Grimm, Stephan
We report on the characteristics of an active fiber with core material made by sintering of Yb-doped silica powders as an alternative to conventional modified chemical vapor deposition (MCVD) technique. This material provides the possibility to design very large and homogenously rare-earth doped active fiber cores. We have determined a fiber background attenuation of 20 dB/km and measured a slope efficiency of 80 %. These values are comparable to established fibers made by MCVD technology.

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