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

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.

Other conference communications or articles related to authors from the University of Cantabria

 Authorship: Dorosz D., Kochanowicz M., Lesniak M., Müller R., Lorenz M., Kobelke J., Wondraczek K., Valiente R., Diego-Rucabado A., Cano I., Aguado F., Gluch J., Kinski I., Jäger M.,

 Congress: SPIE Photonics Europe 2022: Fiber Lasers and Glass Photonics, Materials through Applications (3º : 2022 : Estrasburgo)

 Publisher: SPIE Society of Photo-Optical Instrumentation Engineers

 Publication date: 25/05/2022

 No. of pages: 5

 Publication type: Conference object

 DOI: 10.1117/12.2624448

 ISSN: 0277-786X,1996-756X

 European project: info:eu-repo/grantAgreement/EC/H2020/629161/EU/NanoCrystals in Fibre Lasers/NCLas/

 Publication Url: https://doi.org/10.1117/12.2624448

Authorship

DOMINIK DOROSZ

KOCHANOWICZ, MARCIN

LESNIAK, MAGDALENA

MÜLLER, ROBERT

LORENZ, MARTIN

KOBELKE, JENS

WONDRACZEK, KATRIN

ANDREA DIEGO RUCABADO

ISRAEL CANO RICO

GLUCH, JÜRGEN

KINSKI, ISABEL

JÄGER, MATTHIAS L.