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We investigated the influence of the atmosphere during preform collapsing (Cl2/O2, He, reducing gases as CO and H2)
on the photodarkening process in ytterbium doped silica fibers. The measurements were performed for a probe
wavelength of 633nm in-situ during cladding pumping at 915 nm in dependence on the Yb inversion. The equilibrium
values of the core excess loss were found to be remarkably lower in the fibers from preforms collapsed with the
treatment of He or reducing gases, whereas the photodarkening rate constants are rather similar. Subsequent
measurements of the fluorescence properties (pump wavelength 915nm or 976 nm) were carried out at the
photodarkened fibers and compared to earlier results obtained at fibers as drawn.
Laser experiments with the different fibers at low Yb inversion (no photodarkening) show a decrease of the laser slope
efficiency in parallel to the degree of reduction of the doped core glasses. For the He treatment, an optimum of lowered
photodarkening loss and reasonable laser efficiency can be obtained.
S. Jetschke,S. Unger,A. Schwuchow,M. Leich,V. Reichel, andJ. Kirchhof
"Photodarkening in Yb-doped silica fibers: influence of the atmosphere during preform collapsing", Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68731G (22 February 2008); https://doi.org/10.1117/12.776638
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S. Jetschke, S. Unger, A. Schwuchow, M. Leich, V. Reichel, J. Kirchhof, "Photodarkening in Yb-doped silica fibers: influence of the atmosphere during preform collapsing," Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68731G (22 February 2008); https://doi.org/10.1117/12.776638