Journal article 872 views
Effective photodarkening suppression in Yb-doped fiber lasers by visible light injection
Riccardo Piccoli,
Thierry Robin,
Thomas Brand,
Udo Klotzbach,
Stefano Taccheo 
Optics Express, Volume: 22, Issue: 7, Start page: 7638
Swansea University Author:
Stefano Taccheo
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DOI (Published version): 10.1364/OE.22.007638
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 abo...
| Published in: | Optics Express |
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| ISSN: | 1094-4087 |
| Published: |
2014
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa21338 |
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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. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
7 |
| Start Page: |
7638 |