Applied Physics B

, 123:227 | Cite as

Modelling the competition between photo-darkening and photo-bleaching effects in high-power ytterbium-doped fibre amplifiers

  • A. JollyEmail author
  • C. Vinçont
  • Ch. Pierre
  • J. Boullet


We propose an innovative, fully space–time model to take into account the seed-dependent nature of ageing penalties in high-power ytterbium-doped fibre amplifiers. Ageing is shown to be based on the on-going competition between photo-darkening and photo-bleaching phenomena. Our approach is based on the natural interplay between the excited states of co-existing ytterbium pairs and colour centres in highly doped fibres, in the presence of thermal coupling between the closely spaced excited states. As initiated from IR photons, the excitation of colour centres up to the UV band is supposed to be governed by multi-photon absorption. The interactions of interest in the kinetics of photo-bleaching then take the form of highly efficient charge transfers, which imply the reduction of some fraction of the basically trivalent ions to their divalent state. Due to the activation of ytterbium pairs by means of energy transfer up-conversion, these interactions get more and more effective at elevated operating powers. Computational results using these principles actually help to fit our experimental data regarding seeding effects, as well as fully generic trends already evidenced in the literature. This gives a fine demonstration for the need to discriminate co-active pump and signal contributions. Our self-consistent, still simplified model then consists of a valuable tool to help for a deeper understanding of the ageing issues. Furthermore, considering higher-order ytterbium aggregates, this should open new routes towards more comprehensive models.



The Conseil-Régional-d’Aquitaine is greatly acknowledged. This work was made possible within the framework of the S.E.M.L. Route-des-Lasers, for supporting programmes dedicated to emerging applications in the laser industry. Many thanks also to Dr S. Vidal from ALPhANOV, for useful advice and comments.


  1. 1.
    C. Jauregui, T. Eidam, J. Limpert, A. Tünnermann, Impact of modal interference on the beam quality of high-power fiber amplifiers. Opt. Express 19(4), 3258–3271 (2011)ADSCrossRefGoogle Scholar
  2. 2.
    H.-J. Otto, N. Modsching, C. Jauregui, J. Limpert, A. Tünnermann, Impact of photo-darkening on the mode instability threshold. Opt. Express 23(12), 15265–15277 (2015)ADSCrossRefGoogle Scholar
  3. 3.
    M. Leich, U. Ropke, S. Jetschke, S. Unger, V. Reichel, J. Kirchhof, Non isothermal bleaching of photo-darkenedYb-doped fibers. Opt. Express 17(15), 12588–12593 (2009)ADSCrossRefGoogle Scholar
  4. 4.
    R. Piccoli, T. Robin, T. Brand, U. Klotzbach, S. Taccheo, Effective photo-darkening suppression in Yb-doped fibre lasers by visible light injection. Opt. Express 22(7), 7638–7643 (2014)ADSCrossRefGoogle Scholar
  5. 5.
    J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel, The influence of Yb2+ ions on optical properties and power stability of ytterbium doped laser fibers. Proc. SPIE 7598B1, 7598B1 (2010)ADSGoogle Scholar
  6. 6.
    M. Engholm, S. Rydberg, K. Hammarling, Strong excited state absorption (ESA) in Yb-doped fiber lasers. Proc. SPIE 8601, 86010 P-1 (2013)CrossRefGoogle Scholar
  7. 7.
    W.P. Qin, Z.Y. Liu, C.F. Wu, G.S. Qin, Z. Chen, K.Z. Zheng, Multi-ion cooperative processes in Yb3+ clusters. Light Sci. Appl. 3, e193 (2014).
  8. 8.
    S. Jetschke, A. Schwuchow, S. Unger, “Transient absorption in pumped Yb-fibers opens a path to photo-darkening. Laser Phys. Lett. 11, 085101 (2014)ADSCrossRefGoogle Scholar
  9. 9.
    J. Boullet, C. Vinçont, C. Aguergaray, and A. Jolly, ‘Regime-dependence of photo-darkening-induced modal degradation threshold in high power photonic crystal fiber amplifier,’ proc. ASSP– Boston-USA (2016)Google Scholar
  10. 10.
    S. Jetschke, S. Unger, U. Röpke, J. Kirchhof, Photo-darkening in Yb doped fibers: experimental evidence of equilibrium states depending on the pump power. Opt. Express 15(22), 14838–14843 (2007)ADSCrossRefGoogle Scholar
  11. 11.
    F. Mady, J.-B. Duchez, Y. Mebrouk, M. Benabdesselam, A physical model of the photo- and radiation-induced degradation of ytterbium-doped silica optical fibre. Fundam. Appl. Silica Adv. Dielect. AIP Conf. Proc. 1624, 87–94 (2014)ADSCrossRefGoogle Scholar
  12. 12.
    K.E. Mattson, The three-electron bond SiO2: Yb absorption center of pre-darkened ytterbium-doped silica. Opt. Express 21(10), 12849–12864 (2013)ADSCrossRefGoogle Scholar
  13. 13.
    A.A. Rybaltovsky, A.A. Umnikov, K.K. Bobkov, D.S. Lipatov, A.N. Romanov, M.E. Likhachev, V.B. Sulimov, A.N. Guryanov, M.M. Bubnov, E.M. Dianov, Role of oxygen hole centres in the photo-darkening of ytterbium-doped phosphor-silicate fibre. Quantum Electr. 43(11), 1037–1042 (2013)ADSCrossRefGoogle Scholar
  14. 14.
    A. Jolly, C. Vinçont, J. Boullet, Photo-darkening kinetics in a high-power YDFA versus CW or short-pulse seed-conditions 10083-64. Proc. SPIE 10083, 100831T (2017)CrossRefGoogle Scholar
  15. 15.
    H. Gebavi, S. Taccheo, D. Milanese, A. Monteville, O. Le Goffic, D. Landais, D. Mechin, D. Tregoat, B. Cadier, T. Robin, Temporal evolution and correlation between cooperative luminescence and photo-darkening in ytterbium doped silica fibers. Opt. Express 19(25), 25077–25083 (2011)ADSCrossRefGoogle Scholar
  16. 16.
    M. Engholm, L. Norin, Preventing photo-darkening in ytterbium-doped high power lasers; correlation to the UV-transparency of the core glass. Opt. Express 16(2), 1260–1268 (2008)ADSCrossRefGoogle Scholar
  17. 17.
    L. Skuja, H. Hosono, M. Hirano, Laser-induced color centers in silica, in Laser-Induced Damage in Optical Materials, vol. 4347, ed. by G.J. Exarhos, A.H. Guenther, M.R. Kozlowski, K.L. Lewis, M.J. Soileau (SPIE, 2001)Google Scholar
  18. 18.
    A.A. Rybaltovsky, K.K. Bobkov, V.V. Velmiskin, A.A. Umnikov, I.A. Shestakova, A.N. Guryanov, M.E. Likhachev, M.M. Bubnov, E.M. Dianov, The Yb-doped alumino-silicate fibers photo-darkening mechanism based on the charge-transfer state excitation. Proc. SPIE 8961, 896116-1 (2014)Google Scholar
  19. 19.
    K.K. Bobkov, A.A. Rybaltovsky, V.V. Velmiskin, M.E. Likhachev, M.M. Bubnov, E.M. Dianov, A.A. Umnikov, A.N. Guryanov, N.N. Vechkanov, I.A. Shestakova, Charge-transfer state excitation as the main mechanism of the photo-darkening process in ytterbium-doped alumino-silicate fibres. Quantum Electr. 44, 1129–1135 (2014)ADSCrossRefGoogle Scholar
  20. 20.
    R. Peretti, A.-M. Jurdyc, C. Gonnet, A new vision of photo-darkening in Yb-doped fibers. Proc. SPIE 8257, 825705-1 (2012)Google Scholar
  21. 21.
    S. Rydberg, M. Engholm, Experimental evidence for the formation of divalent ytterbium in the photo-darkening process of Yb-doped fiber lasers. Opt. Express 21(6), 6681–6688 (2013)ADSCrossRefGoogle Scholar
  22. 22.
    S. Liu, S. Zheng, C. Tang, X. Li, W. Xu, Q. Sheng, D. Chen, Photoluminescence and radio-luminescence properties of Yb2+-doped silica glass. Mat. Lett. 144, 43–45 (2015)CrossRefGoogle Scholar
  23. 23.
    T. Kitabayashi, M. Ikeda, M. Nakai, K. Himeno, K. Obashi, Population inversion factor dependence of photo-darkening of Yb-doped fibers and its suppression by high aluminium-doping. OFC/NFOE Conf. CD ROM (OSA, Washington-DC) OThC5B (2006)Google Scholar
  24. 24.
    N. Gayathri, B. Bagchi, Non-Marcus energy gap dependence of electron transfer rate in contact ion pairs. Novel interplay between relaxation and reaction in solution. J. Mol. Struct. (Theochem) 361, 117–122 (1996)CrossRefGoogle Scholar
  25. 25.
    J.M. Collins, B. Di Bartolo, Temperature and energy gap dependence of energy transfer between rare-earth ions in solids. J. Luminesc. 69, 335–341 (1996)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.ALPhANOV, Institut d’Optique d’AquitaineTalence CedexFrance
  2. 2.CEA, Centre d’Etudes Scientifiques et Techniques d’AquitaineLe BarpFrance

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