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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 7 — Apr. 7, 2014
  • pp: 7638–7643

Effective photodarkening suppression in Yb-doped fiber lasers by visible light injection

Riccardo Piccoli, Thierry Robin, Thomas Brand, Udo Klotzbach, and Stefano Taccheo  »View Author Affiliations


Optics Express, Vol. 22, Issue 7, pp. 7638-7643 (2014)
http://dx.doi.org/10.1364/OE.22.007638


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Abstract

Al-silicate fibers have excellent manufacturing quality. Unfortunately, high-Yb doping concentration may be limited by severe losses induced by photodarkening phenomenon. In this paper we demonstrate for the first time that Al-silicate Yb-doped fibers with high-inversion and doping concentration above 1 wt% can be successfully used by implementing a simple optical bleaching scheme. A co-injection into the active fiber of a few mW of light at around 550 nm wavelength successfully eliminates almost all photodarkening induced losses. We demonstrate operation at above 90% of the pristine output power level in several lasers with up to 30% Yb ions in the excited state. These results may allow using Yb-doped Al-silicate fibers with doping level increased by one order of magnitude. Finally, we provide a comprehensive picture of main parameters affecting photobleaching performance and, to the best of our knowledge, we report the first quantitative measurement of the Ytterbium excited state absorption cross-section in the visible range.

© 2014 Optical Society of America

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

ToC Category:
Fiber Lasers

History
Original Manuscript: December 26, 2013
Revised Manuscript: March 9, 2014
Manuscript Accepted: March 9, 2014
Published: March 25, 2014

Virtual Issues
Vol. 9, Iss. 6 Virtual Journal for Biomedical Optics
2013 Advanced Solid State Lasers (2013) Optics Express

Citation
Riccardo Piccoli, Thierry Robin, Thomas Brand, Udo Klotzbach, and Stefano Taccheo, "Effective photodarkening suppression in Yb-doped fiber lasers by visible light injection," Opt. Express 22, 7638-7643 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-7-7638


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