Non-isothermal bleaching of photodarkened Yb-doped fibers.
We report on the thermal treatment of photodarkened Yb-doped fiber samples. The method of non-isothermal bleaching at different temperature ramp rates can be used to determine the thermal energy distribution of photodarkening induced color centers. A distributed activation energy with a mean value of about 1.3 eV and a FWHM of 0.5 eV was found. Spectral changes during thermal treatment were observed and could be interpreted, e.g. as an enhancement of the absorption cross section.
Leich
Martin
M
Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany. martin.leich@ipht-jena.de
Röpke
Ulrich
U
Jetschke
Sylvia
S
Unger
Sonja
S
Reichel
Volker
V
Kirchhof
Johannes
J