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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 6 — Mar. 25, 2013
  • pp: 6681–6688

Experimental evidence for the formation of divalent ytterbium in the photodarkening process of Yb-doped fiber lasers

S. Rydberg and M. Engholm  »View Author Affiliations

Optics Express, Vol. 21, Issue 6, pp. 6681-6688 (2013)

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In this work we present experimental evidence that the valence instability of the ytterbium ion play a key role for the observed photodarkening mechanism in Yb-doped fiber lasers. Luminescence and excitation spectroscopy performed on UV irradiated Yb/Al doped silica glass preforms and near-infrared diode pumped photodarkened fibers show a concentration increase of Yb2+ ions. A concentration decrease in Yb3+ could also be observed for the UV irradiated preform. The findings contribute to an increased understanding of the kinetic processes related to photodarkening in Yb-doped high power fiber lasers.

© 2013 OSA

OCIS Codes
(140.3510) Lasers and laser optics : Lasers, fiber
(160.5690) Materials : Rare-earth-doped materials
(260.5210) Physical optics : Photoionization
(140.3615) Lasers and laser optics : Lasers, ytterbium

ToC Category:
Lasers and Laser Optics

Original Manuscript: January 11, 2013
Revised Manuscript: March 3, 2013
Manuscript Accepted: March 4, 2013
Published: March 11, 2013

S. Rydberg and M. Engholm, "Experimental evidence for the formation of divalent ytterbium in the photodarkening process of Yb-doped fiber lasers," Opt. Express 21, 6681-6688 (2013)

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  1. A. Shubin, M. Yashkov, M. Melkumov, S. Smirnov, I. Bufetov, and E. Dianov, “Photodarkening of aluminosilicate and phosphosilicate Yb-doped fibers,” CLEO Europe Conference pp. CJ3–1–THU (2007).
  2. S. Jetschke, S. Unger, A. Schwuchow, M. Leich, and J. Kirchhof, “Efficient Yb laser fibers with low photodarkening by optimization of the core composition,” Opt. Express16, 15540–15545 (2008). [CrossRef] [PubMed]
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  11. Y.-S. Liu, T. C. Galvin, T. Hawkins, J. Ballato, L. Dong, P. Foy, P. Dragic, and J. G. Eden, “Linkage of oxygen deficiency defects and rare earth concentrations in silica glass optical fiber probed by ultraviolet absorption and laser excitation spectroscopy,” Opt. Express20, 14494–14507 (2012). [CrossRef] [PubMed]
  12. J. Jasapara, M. Andrejco, D. DiGiovanni, and R. Windeler, “Effect of heat and H2 gas on the photo-darkening of Yb3+ fibers,” Conf. Digest of CLEO p. CTuq5 (2005).
  13. F. Mady, M. Benabdesselam, and W. Blanc, “Termoluminescence characterization of traps involved in the photodarkening of ytterbium-doped silica fibers,” Opt. Lett.35, 3542–3543 (2010). [CrossRef]
  14. M. Engholm and L. Norin, “Preventing photodarkening in ytterbium-doped high power fiber lasers; correlation to the UV-transparency of the core glass,” Opt. Express2, 1260–1268 (2008). [CrossRef]
  15. S. Rydberg and M. Engholm, “Charge transfer processes and UV induced absorption in Yb:YAG single crystal laser materials,” To be submitted (2013).
  16. J. Kirchhof, S. Unger, A. Schwuchow, S. Grimm, and V. Reichel, “Materials for high-power fiber lasers,” J. Non. Cryst. Solids352, 2399–2403 (2006). [CrossRef]
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  18. A. Guzman Chávez, A. Kir’yanov, Y. Barmenkov, and N. Il’ichev, “Reversible photo-darkening and resonant photobleaching of ytterbium-doped silica fiber at in-core 977-nm and 543-nm irradiation,” Laser Phys. Lett.4, 734–739 (2007). [CrossRef]
  19. I. Manek-Hönninger, J. Boullet, T. Cardinal, F. Guillen, S. Ermeneux, M. Podgorski, R. B. Doua, and F. Sallin, “Photodarkening and photobleaching of an ytterbium-doped silica double clad LMA fiber,” Opt. Express15, 1606–1611 (2007). [CrossRef] [PubMed]
  20. R. Peretti, A.-M. Jurdyc, B. Jacquier, C. Gonnet, A. Pastouret, E. Burov, and O. Cavani, “How do traces of thulium explain photodarkening in Yb doped fibers?,” Opt. Express18, 20455–20460 (2010). [CrossRef] [PubMed]
  21. R. Peretti, C. Gonnet, and A.-M. Jurdyc, “A new vision of photodarkening in Yb3+-doped fibers,” J. of Appl. Phys. 112 093511 (2012).
  22. S. Jetschke, M. Leich, S. Unger, A. Schwuchow, and J. Kirchhof, “Influence of Tm- or Er-codoping on the photodarkening kinetics in Yb fibers,” Opt. Express 19, 14473–14478 (2011). [CrossRef] [PubMed]
  23. M. Engholm and S. Rydberg, “Strong excited state absorption (ESA) in Yb-doped fiber lasers,” Proc. of SPIE8601, (2013).

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