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Nanocrystalline ZrO2-doped active optical fibers for fiber lasers operating at 2 mu m
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SYSNO ASEP 0555639 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Nanocrystalline ZrO2-doped active optical fibers for fiber lasers operating at 2 mu m Author(s) Vařák, Petr (URE-Y)
Mrázek, Jan (URE-Y) RID, ORCID
Blanc, W. (FR)
Aubrecht, Jan (URE-Y) RID
Kamrádek, Michal (URE-Y)
Podrazký, Ondřej (URE-Y) RID
Honzátko, Pavel (URE-Y) RIDNumber of authors 7 Article number 1177317 Source Title Proceedings of SPIE, Micro-structured and Specialty Optical Fibres VII, 11773. - BELLINGHAM : SPIE, 2021 / Kalli K. - ISSN 0277-786X - ISBN 978-1-5106-4381-9 Number of pages 7 s. Publication form Print - P Action Conference on Micro-structured and Specialty Optical Fibres VII Event date 19.04.2021 - 23.04.2021 VEvent location Virtual, Online Country US - United States Event type WRD Language eng - English Country US - United States Keywords Fiber ; Holmium ; Laser Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects GA19-03141S GA ČR - Czech Science Foundation (CSF) Institutional support URE-Y - RVO:67985882 UT WOS 000696183900027 EID SCOPUS 85109208544 DOI 10.1117/12.2589127 Annotation In this work, phase-separated fibers of the system SiO2-ZrO2 doped by thulium and holmium ions were prepared by modified solution-doping method combined with MCVD. The ZrO2 concentration in both fibers was approx. 3 mol. %. The rare-earth ion concentrations were 270 and 740 ppm, respectively. The presence of ZrO2-based nanoparticles in the optical fiber preforms was confirmed by scanning electron microscope (SEM). The background losses of the fibers were in the range of 0.1 - 0.6 dB/m. The fibers exhibited strong emission in the near-infrared region thanks to 4f-4f transitions of rare-earth ions. The photoluminescence decay of both fibers exhibited double exponential character, most likely due to the incorporation of rare-earth ions in different optically active sites, i.e. ZrO2-based nanoparticles and grain boundaries or amorphous silica matrix. The fibers were tested as active mediums in fiber laser setup. The thulium-doped fiber exhibited threshold for laser operation of 233 mW and slope efficiency of 72.7 %. The holmium doped fiber failed to manifest lasing properties. An improved laser performance may be achieved by higher proportion of rare-earth ions incorporating in the favorable environment of the nanoparticles 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 2022 Electronic address https://doi.org/10.1117/12.2589127
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