The crystallization kinetics of Er/Yb co-doped oxyfluoride glasses

Michał Żelechower; Elwira Czerska; Elżbieta Augustyn; Julian Plewa; Radosław Lisiecki; Danuta Stróż; Tomasz Rzychoń; Kinga Rodak; Witold Ryba-Romanowski

doi:10.1117/12.2271442

10 February 2017 The crystallization kinetics of Er/Yb co-doped oxyfluoride glasses

Michał Żelechower, Elwira Czerska, Elżbieta Augustyn, Julian Plewa, Radosław Lisiecki, Danuta Stróż, Tomasz Rzychoń, Kinga Rodak, Witold Ryba-Romanowski

Author Affiliations +

Proceedings Volume 10325, Optical Fibers and Their Applications 2017; 1032509 (2017) https://doi.org/10.1117/12.2271442
Event: 17th Conference on Optical Fibres and Their Applications, 2017, Supraśl, Poland, Poland

Abstract

The intention of the authors is to show a possibility of controlled crystallization of Er/Yb co-doped oxyfluoride glass fibers provided for glass-ceramics core fiber lasers or optical amplifiers at 1550 nm. Selected glasses (the batch composition 48SiO₂11Al₂O₃-7Na₂CO₃-10CaO-10PbO-12PbF₂-1.5/0.6YbF₃-0.5/0.2ErF₃) were examined in the form of powders of diameter 45-100 μm (diameter comparable to that of standard multimode fiber core 62 μm). Powders were annealed at various temperatures and time periods in order to obtain glass-ceramics with different crystalline fraction. DTA measurements and calculations (isothermal and non-isothermal annealing) enabled to determine JMAK (JohnsonMehl-Avrami-Kissinger) equation parameters and to estimate crystal growth rate and certain features of nucleation stage. XRD/TEM/SAED/EDS/HRTEM/SEM/EDS techniques (X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy) enabled to determine crystal structure of growing crystals (erbium and ytterbium enriched hexagonal PbF₂, erbium and ytterbium enriched cubic PbF₂ isomorphic to the fluorite structure). Luminescence intensity at 1550 nm under 488/980 nm excitation has shown comparable values for glassceramics powder and for bulk glass what suggests a considerably higher emission yield for glass-ceramics fiber. The lifetime of erbium excited state for glass-ceramics powder (~4 ms) is also comparable to that of bulk glass and is promising from the point of view of a stimulated emission. Computed parameters of JMAK equation enable to establish heat treatment conditions for glass fibers and hence to control the level (fraction) of glass crystallization.

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Michał Żelechower, Elwira Czerska, Elżbieta Augustyn, Julian Plewa, Radosław Lisiecki, Danuta Stróż, Tomasz Rzychoń, Kinga Rodak, and Witold Ryba-Romanowski "The crystallization kinetics of Er/Yb co-doped oxyfluoride glasses", Proc. SPIE 10325, Optical Fibers and Their Applications 2017, 1032509 (10 February 2017); https://doi.org/10.1117/12.2271442

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