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