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Proceedings Paper

Characterization of photodarkening processes in Yb doped fibers
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Paper Abstract

The time-dependence of photodarkening (PD) in Yb-doped fibers is commonly fitted with a stretched exponential function to determine typical parameters of the process. But, the experimental conditions to obtain consistent results from the comparison of PD for different pump powers, various concentrations of the dopants, or fibers from different manufacturers are not adequately regarded up to now. We discuss the requirements concerning the measurement method as well as the impact of the initial state of the fiber under test. Further on, the experimental results of PD characteristics are discussed in the framework of a kinetic model of the observed processes. The discussion of the measurable PD loss is expanded by introducing the concept of the "PD state" that defines the PD loss as a weighted mean and takes effect on the further evolution of the process. In this way, the basis of fiber characterization and the understanding of the PD kinetics will be improved.

Paper Details

Date Published: 19 February 2009
PDF: 12 pages
Proc. SPIE 7195, Fiber Lasers VI: Technology, Systems, and Applications, 71952B (19 February 2009); doi: 10.1117/12.807544
Show Author Affiliations
S. Jetschke, Institute of Photonic Technology (Germany)
U. Röpke, Institute of Photonic Technology (Germany)
S. Unger, Institute of Photonic Technology (Germany)
J. Kirchhof, Institute of Photonic Technology (Germany)

Published in SPIE Proceedings Vol. 7195:
Fiber Lasers VI: Technology, Systems, and Applications
Denis V. Gapontsev; Dahv A. Kliner; Jay W. Dawson; Kanishka Tankala, Editor(s)

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