Abstract
The description of the photodarkening (PD) kinetics of Yb-doped silica fibers with a stretched exponential function is analyzed in more detail, revealing a dependence of the determined PD parameter values on the measurement time. Thereby, serious uncertainties may occur in advanced interpretations of the results, e.g., the discussion of the rate constant as a function of the Yb inversion, if the measurement time is too short. A method to circumvent the problems of the fitting procedure is suggested, taking advantage of the self-similarity of the PD curves for different inversions. An exponent of in the power-law dependence of the PD rate constant on the Yb inversion was found for a typical aluminium-codoped fiber.
© 2008 Optical Society of America
Full Article | PDF ArticleMore Like This
Joona Koponen, Mikko Söderlund, Hanna J. Hoffman, Dahv A. V. Kliner, Jeffrey P. Koplow, and Mircea Hotoleanu
Appl. Opt. 47(9) 1247-1256 (2008)
Sylvia Jetschke, Sonja Unger, Ulrich Röpke, and Johannes Kirchhof
Opt. Express 15(22) 14838-14843 (2007)
Sylvia Jetschke, Martin Leich, Sonja Unger, and Ulrich Röpke
J. Opt. Soc. Am. B 36(9) 2438-2444 (2019)