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9 October 2021 Investigation of photodarkening in Yb-doped fibers with fluorescence spectra
Ji Won Kim, J. S. Park, E. J. Park, Y. J. Oh, Hoon Jeong
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Proceedings Volume 11890, Advanced Lasers, High-Power Lasers, and Applications XII; 118900J (2021) https://doi.org/10.1117/12.2601013
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China
Abstract
We report experimental investigation of PD in Yb-doped fibers. From fluorescence spectra while pumping at 1018 nm and 976 nm, we can attribute the PD to existence of oxygen deficiency centers and its strong dependence on the excited Yb3+ ion density. Furthermore, we investigated the impact of PD on the laser amplification experiment, demonstrating that the tandem pumping at 1018 nm could dramatically reduce the PD-induced background loss compared to the LD pumping at 976 nm due to the low excited Yb3+ density. We will discuss the way to mitigate the PD in high power Yb fiber lasers.
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Ji Won Kim, J. S. Park, E. J. Park, Y. J. Oh, and Hoon Jeong "Investigation of photodarkening in Yb-doped fibers with fluorescence spectra", Proc. SPIE 11890, Advanced Lasers, High-Power Lasers, and Applications XII, 118900J (9 October 2021); https://doi.org/10.1117/12.2601013
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KEYWORDS
Optical fibers
Luminescence
Fiber lasers
Ions
Oxygen
Ytterbium
Laser systems engineering
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