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Optics Express

Optics Express

  • Editor: Martijn de Sterke
  • Vol. 16, Iss. 20 — Sep. 29, 2008
  • pp: 15540–15545

Efficient Yb laser fibers with low photodarkening by optimization of the core composition

Sylvia Jetschke, Sonja Unger, Anka Schwuchow, Martin Leich, and Johannes Kirchhof  »View Author Affiliations

Optics Express, Vol. 16, Issue 20, pp. 15540-15545 (2008)

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We report on photodarkening (PD) investigations at Yb doped fibers with specific variation of the concentrations of the codopants aluminum and phosphorus, measured during cladding pumping at 915 nm. A core composition with equal content of Al and P is most promising to achieve Yb fibers with low PD, high laser efficiency and low numerical aperture of the laser core despite of high codoping. A laser output power of more than 100 W was demonstrated on such a fiber with a slope efficiency of 72%. The correlation of the PD loss with the NIR-excited cooperative luminescence encourages the supposition that cooperative energy transfer from excited Yb3+ ions to the atomic defect precursors in the core glass enables the formation of color centers in the pump-induced PD process.

© 2008 Optical Society of America

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(160.2290) Materials : Fiber materials
(160.5690) Materials : Rare-earth-doped materials

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: July 31, 2008
Revised Manuscript: September 4, 2008
Manuscript Accepted: September 10, 2008
Published: September 17, 2008

Sylvia Jetschke, Sonja Unger, Anka Schwuchow, Martin Leich, and Johannes Kirchhof, "Efficient Yb laser fibers with low photodarkening by optimization of the core composition," Opt. Express 16, 15540-15545 (2008)

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  1. J. Koponen, M. Söderlund, H. J. Hoffman, D. Kliner, and J. Koplow, "Photodarkening Measurements in Large-Mode-Area Fibers," Proc. SPIE 6453, 64531E-1-11 (2007).
  2. A. V. Shubin, M. V. Yashkov, M. A. Melkumov, S. A. Smirnow, I. A. Bufetov, and E. M. Dianov, "Photodarkening of aluminosilicate and phosphosilicate Yb-doped fibers," in Conf. Digest of CLEO Europe-EQEC 2007, CJ3-1-THU (2007).
  3. S. Jetschke, S. Unger, U. Röpke, and J. Kirchhof, "Photodarkening in Yb doped fibers: experimental evidence of equilibrium states depending on the pump power," Opt. Express 15, 14838-14843 (2007). [CrossRef] [PubMed]
  4. M. J. Söderlund, J. J. Montiel i Ponsoda, S. K. T. Tammela, K. Ylä-Jarkko, A. Salokatve, and S. Honkanen, "Mode-induced transverse photodarkening loss variations in large-mode-area ytterbium doped silica fibers," Opt. Express 16, 10633-10640 (2008). [CrossRef] [PubMed]
  5. M. Engholm, L. Norin, and D. Aberg, "Strong UV absorption and visible luminescence in ytterbium-doped aluminosilicate glass under UV excitation," Opt. Lett. 32, 3352-3354 (2007). [CrossRef] [PubMed]
  6. M. Engholm and L. Norin, "Preventing photodarkening in ytterbium-doped high power fiber lasers; correlation to the UV-transparency of the core glass," Opt. Express 16, 1260-1268 (2008). [CrossRef] [PubMed]
  7. S. Yoo, C. Basu, A. J. Boland, C. Sones, J. Nilsson, J. K. Sahu, and D. Payne, "Photodarkening in Yb-doped aluminosilicate fibers induced by 488 nm irradiation," Opt. Lett. 32, 1626-1628 (2007). [CrossRef] [PubMed]
  8. P. D. Dragic, C. G. Carlson, and A. Croteau, "Characterization of defect luminescence in Yb doped silica fibers: part I: NBOHC," Opt. Express 16, 4688-4697 (2008). [CrossRef] [PubMed]
  9. T. Kitabayashi, M. Ikeda, M. Nakai, T. Sakai, K. Himeno, and K. Ohashi, "Population Inversion Factor Dependence of Photodarkening of Yb-doped Fibers and its Suppression by Highly Aluminium Doping," in OFC/ NFOE Conference on CD-ROM (Opt. Society of America, Washington, DC, 2006), OThC5 (2006).
  10. S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, A. Scheffel, and J. Kirchhof, "Optical properties of Yb-doped laser fibers in dependence on codopants and preparation conditions," Proc. SPIE 6890, 16 (2008).
  11. M. A. Melkumov, I. A. Bufetov, K. S. Kratsov, A. V. Shubin, and E. M. Dianov, "Lasing parameters of ytterbium-doped fibres doped with P2O5 and Al2O3," Quantum Electron. 34, 843-848 (2004).
  12. J. Kirchhof, S. Unger, A. Schwuchow, S. Grimm, and V. Reichel, "Materials for high-power fiber lasers," J. Non-Cryst. Solids 352, 2399-2403 (2006). [CrossRef]
  13. J. Kirchhof, S. Unger, and A. Schwuchow, "Properties of Yb-doped materials for solid and microstructured high power fiber lasers", in Proceedings of ICMAT 2007 Symposium on Microstructured and Nanostructured Optical Fibers, Singapore, 1-6 July, 2007.
  14. S. Unger, A. Schwuchow, J. Dellith, and J. Kirchhof, "Codoped materials for high power fiber lasers - diffusion behaviour and optical properties," Proc. SPIE 6469, 13 (2007).
  15. J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, and B. Knappe, "Dopant interactions in high-power laser fibers," Proc. SPIE 5723, 261-272 (2005). [CrossRef]

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