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Thulium-Doped Silica fibers with enhanced fluorescence lifetime and their application in ultrafast fiber lasers
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SYSNO ASEP 0499885 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Thulium-Doped Silica fibers with enhanced fluorescence lifetime and their application in ultrafast fiber lasers Author(s) Cajzl, Jakub (URE-Y)
Peterka, Pavel (URE-Y) RID
Kowalczyk, M. (PL)
Tarka, J. (PL)
Sobon, G. (PL)
Sotor, J. (PL)
Aubrecht, Jan (URE-Y) RID
Honzátko, Pavel (URE-Y) RID
Kašík, Ivan (URE-Y) RIDNumber of authors 9 Article number 66 Source Title FIBERS. - : MDPI - ISSN 2079-6439
Roč. 6, č. 3 (2018)Number of pages 15 s. Language eng - English Country CH - Switzerland Keywords Energy transfer ; Cross-relaxation ; Fiber lasers 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) Institutional support URE-Y - RVO:67985882 UT WOS 000448397500024 EID SCOPUS 85053817280 DOI https://doi.org/10.3390/fib6030066 Annotation In this work we report on the thulium-doped silica-based optical fibers with increased fluorescence lifetime of the F-3(4) level thanks to the modification of the local environment of thulium ions by high content of alumina. The determination of the cross-relaxation energy-transfer coefficients from the measurements of the fluorescence lifetimes of the F-3(4) and H-3(4) energy levels of Tm3+ ions in the experimentally prepared optical fiber is provided as well. Preforms of optical fibers were prepared either by conventional solution-doping of Tm3+ and Al3+ ions or by dispersion-doping of Tm3+ ions with alumina nanoparticles. Optical fibers were characterized by means of Tm, Al, and Ge concentrations, refractive index profiles, optical spectral absorption and luminescence, and by time-resolved fluorescence spectroscopy. Highly aluminium-codoped thulium silicate optical fibers exhibited fluorescence lifetimes of over similar to 500 s with maximum value of 756 s, which means a fluorescence lifetime enhancement when compared to the thulium-doped fibers reported elsewhere. We show an application of the thulium-doped fiber in a compact all-fiber ring laser that is passively mode-locked by using graphene-based saturable absorber. The output pulsewidth and repetition rate were 905 fs and 32.67 MHz, respectively 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 2019
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