Glass powder doping of nanocrystal-doped fibres: challenges and results

Dominik Dorosz; Marcin Kochanowicz; Magdalena Lesniak; Robert Müller; Martin Lorenz; Jens Kobelke; Katrin Wondraczek; Rafael Valiente; Andrea Diego-Rucabado; Israel Cano; Fernando Aguado; Jürgen Gluch; Isabel Kinski; Matthias L. Jäger

doi:10.1117/12.2624448

25 May 2022 Glass powder doping of nanocrystal-doped fibres: challenges and results

Dominik Dorosz, Marcin Kochanowicz, Magdalena Lesniak, Robert Müller, Martin Lorenz, Jens Kobelke, Katrin Wondraczek, Rafael Valiente, Andrea Diego-Rucabado, Israel Cano, Fernando Aguado, Jürgen Gluch, Isabel Kinski, Matthias L. Jäger

Author Affiliations +

Proceedings Volume 12142, Fiber Lasers and Glass Photonics: Materials through Applications III; 1214202 (2022) https://doi.org/10.1117/12.2624448
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Incorporating new optical materials as nanocrystals into glass fibres for new functionalities has recently become a hot research topic. Our team (funded by the European FET Open project NCLAS) investigates the introduction of nanoscale laser crystallites into the core of optical fibres using the glass powder doping method. Active Y₂O₃:Pr³⁺ nanocrystals (NCs) were prepared via different synthesis methods, and structurally and spectroscopically characterized. After modification of technological parameters, the optimised NCs have been proposed as a luminescence centres to embed into germanate and silicate glass hosts. Glasses were analysed in terms of optical (transmission, refractive index matching to NCs) and thermal (thermal stability, viscosity, thermal expansion coefficient) parameters. Crystallisation issues during fibre drawing were particularly investigated. In a first step, glass powder-NCs mixing techniques and fibre preform preparation were developed. It was shown that temperature cycle profiles including dwell time and heating/cooling ramp rates influenced the glass-NCs properties and can lead to glass crystallisation or NCs dissolution. The sintering investigations pointed out the melting temperature limits to preserve active NCs in the glasses. In germanate glasses, Y₂O₃:Pr³⁺ dissolution was noticed at 800°C. In the case of the silicate glass compositions these regions vary from 700°C to 1050°C. The results allowed to select optical fibre drawing conditions performed by the powder-in-tube method. Their distribution uniformity is not yet sufficient, requiring further optimisation of the drawing kinetics.

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Dominik Dorosz, Marcin Kochanowicz, Magdalena Lesniak, Robert Müller, Martin Lorenz, Jens Kobelke, Katrin Wondraczek, Rafael Valiente, Andrea Diego-Rucabado, Israel Cano, Fernando Aguado, Jürgen Gluch, Isabel Kinski, and Matthias L. Jäger "Glass powder doping of nanocrystal-doped fibres: challenges and results", Proc. SPIE 12142, Fiber Lasers and Glass Photonics: Materials through Applications III, 1214202 (25 May 2022); https://doi.org/10.1117/12.2624448

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