Abstract

We report on the characterization of photodarkening (PD) kinetics of Yb-doped fiber samples in a wide temperature range from 77 to $773\mathrm{K}$ and with respect to different ${\mathrm{Yb}}_2{\mathrm{O}}_3$ concentrations from 0.09 up to $0.68\text{\hspace{0.17em} mol}\%$. The thermal dependency of important PD parameters is presented for a uniform Yb inversion of about 0.46. We have found out that PD kinetics is affected remarkably by temperature during pumping and that PD saturation is an equilibrium of optical and thermal processes, achieved after passing a loss maximum. The saturated loss for time tending to infinity obviously depends on the fiber temperature.

© 2010 Optical Society of America

Photodarkening rate in Yb-doped silica fibers

Joona Koponen, Mikko Söderlund, Hanna J. Hoffman, Dahv A. V. Kliner, Jeffrey P. Koplow, and Mircea Hotoleanu
Appl. Opt. 47(9) 1247-1256 (2008)

Non-isothermal bleaching of photodarkened Yb-doped fibers

Martin Leich, Ulrich Röpke, Sylvia Jetschke, Sonja Unger, Volker Reichel, and Johannes Kirchhof
Opt. Express 17(15) 12588-12593 (2009)

Influence of Tm- or Er-codoping on the photodarkening kinetics in Yb fibers

Sylvia Jetschke, Martin Leich, Sonja Unger, Anka Schwuchow, and Johannes Kirchhof
Opt. Express 19(15) 14473-14478 (2011)

Photodarkening-induced increase of fiber temperature

Joan J. Montiel i Ponsoda, Mikko J. Söderlund, Jeffrey P. Koplow, Joona J. Koponen, and Seppo Honkanen
Appl. Opt. 49(22) 4139-4143 (2010)

Combined effect of Yb inversion and pump photons on photodarkening in Yb laser fibers: experiments and model considerations

Sylvia Jetschke, Martin Leich, Sonja Unger, and Ulrich Röpke
J. Opt. Soc. Am. B 36(9) 2438-2444 (2019)