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Nanocrystalline ZrO2-doped active optical fibers for fiber lasers operating at 2 mu m

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    0555639 - ÚFE 2022 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
    Vařák, Petr - Mrázek, Jan - Blanc, W. - Aubrecht, Jan - Kamrádek, Michal - Podrazký, Ondřej - Honzátko, Pavel
    Nanocrystalline ZrO2-doped active optical fibers for fiber lasers operating at 2 mu m.
    Proceedings of SPIE. Vol. 11773. BELLINGHAM: SPIE, 2021 - (Kalli, K.), č. článku 1177317. ISBN 978-1-5106-4381-9. ISSN 0277-786X. E-ISSN 1996-756X.
    [Conference on Micro-structured and Specialty Optical Fibres VII. Virtual, Online (US), 19.04.2021-23.04.2021]
    Grant CEP: GA ČR(CZ) GA19-03141S
    Institucionální podpora: RVO:67985882
    Klíčová slova: Fiber * Holmium * Laser
    Obor OECD: Optics (including laser optics and quantum optics)
    https://doi.org/10.1117/12.2589127

    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
    Trvalý link: http://hdl.handle.net/11104/0330093

     
     
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