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Appl. Sci. 2018, 8(5), 833; https://doi.org/10.3390/app8050833

YAG Ceramic Nanocrystals Implementation into MCVD Technology of Active Optical Fibers

1
Institute of Photonics and Electronics of the Czech Academy of Sciences, Chaberska 57, 182 51 Prague 8, Czech Republic
2
Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehova 7, 115 19 Prague 1, Czech Republic
3
Department of Solid State Physics, University of P. J. Safarik in Kosice, Park Angelinum 9, 04154 Kosice, Slovakia
4
Institute of Materials of the Slovak Academy of Sciences, Watsonova 47, 04353 Kosice, Slovakia
5
Université Côte d’Azur, INPHYNI, CNRS UMR7010, Parc Valrose, 06108 Nice, France
*
Author to whom correspondence should be addressed.
Received: 29 April 2018 / Revised: 15 May 2018 / Accepted: 15 May 2018 / Published: 21 May 2018
(This article belongs to the Special Issue Rare-Earth Doping for Optical Applications)
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Abstract

Nanoparticle doping is an alternative approach the conventional solution doping method allowing the preparation of active optical fibers with improved optical and structural properties. The combination of the nanoparticle doping with MCVD process has brought new technological challenges. We present the preparation of fiber lasers doped with Er-doped yttrium aluminum garnet (Er:YAG) nanocrystals. These nanocrystals, prepared by a hydrothermal reaction, were analyzed by several structural methods to determine the mean nanocrystal size and an effective hydrodynamic radius. The nanocrystals were incorporated into silica frits with various porosity made by the conventional MCVD process. The Er:YAG-doped silica frits were processed into preforms, which were drawn into optical fibers. We studied the effect of the nanocrystal size and frit’s porosity on the final structural and optical properties of prepared preforms and optical fibers. Selected optical fibers were tested as an active medium in a fiber ring laser setup and the characteristics of the laser were determined. Optimal laser properties were achieved for the fiber length of 7 m. The slope efficiency of the fiber laser was about 42%. Presented method can be simply extended to the deposition of other ceramic nanomaterials. View Full-Text
Keywords: nanocrystals; yttrium aluminum garnet; erbium; special optical fiber nanocrystals; yttrium aluminum garnet; erbium; special optical fiber
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Mrázek, J.; Kašík, I.; Procházková, L.; Čuba, V.; Girman, V.; Puchý, V.; Blanc, W.; Peterka, P.; Aubrecht, J.; Cajzl, J.; Podrazký, O. YAG Ceramic Nanocrystals Implementation into MCVD Technology of Active Optical Fibers. Appl. Sci. 2018, 8, 833.

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