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

P. Vařák; J. Mrázek; W. Blanc; J. Aubrecht; M. Kamrádek; O. Podrazký; P. Honzátko

doi:10.1117/12.2589127

18 April 2021 Nanocrystalline ZrO₂-doped active optical fibers for fiber lasers operating at 2 μm

P. Vařák, J. Mrázek, W. Blanc, J. Aubrecht, M. Kamrádek, O. Podrazký, P. Honzátko

Proceedings Volume 11773, Micro-structured and Specialty Optical Fibres VII; 1177317 (2021) https://doi.org/10.1117/12.2589127
Event: SPIE Optics + Optoelectronics, 2021, Online Only

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Abstract

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.

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P. Vařák, J. Mrázek, W. Blanc, J. Aubrecht, M. Kamrádek, O. Podrazký, and P. Honzátko "Nanocrystalline ZrO₂-doped active optical fibers for fiber lasers operating at 2 μm", Proc. SPIE 11773, Micro-structured and Specialty Optical Fibres VII, 1177317 (18 April 2021); https://doi.org/10.1117/12.2589127

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