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Nanoparticle and Solution Doping for Efficient Holmium Fiber Lasers
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SYSNO ASEP 0518367 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Nanoparticle and Solution Doping for Efficient Holmium Fiber Lasers Author(s) Kamrádek, Michal (URE-Y)
Kašík, Ivan (URE-Y) RID
Aubrecht, Jan (URE-Y) RID
Mrázek, Jan (URE-Y) RID, ORCID
Podrazký, Ondřej (URE-Y) RID
Cajzl, Jakub (URE-Y)
Vařák, Petr (URE-Y)
Kubeček, V. (CZ)
Peterka, Pavel (URE-Y) RID
Honzátko, Pavel (URE-Y) RIDNumber of authors 10 Article number 7103610 Source Title IEEE Photonics Journal. - : Institute of Electrical and Electronics Engineers - ISSN 1943-0655
Roč. 11, č. 5 (2019)Number of pages 10 s. Publication form Print - P Language eng - English Country US - United States Keywords Fiber laser ; infrared fibers Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects GA17-20049S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support URE-Y - RVO:67985882 UT WOS 000487490800001 DOI 10.1109/JPHOT.2019.2940747 Annotation Efficient holmium fiber lasers have been studied as attractive laser sources operating around 2.1 mu m. We report on holmium-doped silica fibers prepared by the modified chemical vapor deposition in combination with either a solution-doping method or a nanoparticle-doping method. A set of 15 fibers with various compositions was characterized and compared with respect to their fluorescence lifetime, laser slope efficiency and laser threshold. This set of fibers in wide concentration ranges allowed us to assess reliably the influence of material composition and the influence of doping method. The best-performance fibers exhibited slope efficiency 83.1%, laser threshold 155 mW and a record value of upper laser level lifetime of 1.35 ms. These results were achieved in fibers with holmium concentration lower than 800 molar ppm and Al/Ho molar ratio greater than 70. Significant differences between fibers prepared by solution doping and nanoparticle doping were not observed. The behavior of Al2O3 nanoparticles during fiber preparation is discussed in details Workplace Institute of Radio Engineering and Electronics Contact Petr Vacek, vacek@ufe.cz, Tel.: 266 773 413, 266 773 438, 266 773 488 Year of Publishing 2020 Electronic address https://ieeexplore.ieee.org/document/8831379
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