Abstract：We study the photodarkening effect in a double clad ytterbium-doped silica fiber fabricated by modified chemical vapor deposition and solution doping. A common measurement technology for photodarkening is used to study the photodarkening-induced absorption spectra. We present a fast and simple method to observe the PD effect by measurement of the fluorescence spectra. The method proposed here can be used to observe the influence for a short time, and thus reduces the requirements of system stability and heat management. It is obtained that under the condition of 45.5% Yb ion inversion level, photodarkening-induced excessive loss at an equilibrium state is above 4.5 dB/m and florescence intensity degradation is above 10% after 500 min pumping at 1041 nm for the home-made normal Yb/Al co-doped silica fiber.
[1] Mourou G, Brocklesby B, Tajima T and Limpert J 2013 Nat. Photon.7 258 [2] Shiner B 2010 Nat. Photon.4 290 [3] Gabzdyl J 2008 Nat. Photon.2 21 [4] Jeong Y, Sahu J K, Payne D N and Nilsson J 2004 Opt. Express12 6088 [5] Zhou J, Lou Q H, Kong L F, Wu Z L, Xue D, Dong J X, Wei Y R, Ye Z H, Zhu J Q and Wang Z J 2004 Chin. Phys. Lett.21 1083 [6] Gapontsev V, Gapontsev D, Platonov N, Shkurikhin O, Fomin V, Mashkin A, Abramov M and Ferin S 2005 Conf. Lasers Electro-Opt. (Baltimore, Maryland 22–27 May 2005) p 508 [7] Koponen J J, S?derlund M J, Hoffman H J and Tammela S K T 2006 Opt. Express14 11539 [8] Jetschke S, Unger S, R?pke U and Kirchhof J 2007 Opt. Express15 14838 [9] Koponen J, S?derlund M, Hoffman H J, Kliner D A V, Koplow J P and Hotoleanu M 2008 Appl. Opt.47 1247 [10] Jetschke S and R?pke U 2009 Opt. Lett.34 109 [11] S?derlund M J, Ponsoda J J M, Koplow J P and Honkanen S 2009 Opt. Express17 9940 [12] Zervas M N, Ghiringhelli F, Durkin M K and Crowe I Proc. SPIE (San Francisco, California 10 February 2011) p 79140L
2013, Vol. 30 
