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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Yang, Zhiyong
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Topics
Publications (8/8 displayed)
- 2021High refractive index IR lenses based on chalcogenide glasses molded by spark plasma sinteringcitations
- 2015Mid infrared supercontinuum generation from chalcogenide glass waveguides and fiberscitations
- 2015Mid infrared supercontinuum generation from chalcogenide glass waveguides and fiberscitations
- 2014Relative contribution of stoichiometry and mean coordination to the fragility of Ge-As-Se glass forming liquidscitations
- 2013Thermoelectric bulk glasses based on the Cu-As-Te-Se systemcitations
- 2010Optical microfabrication of tapers in low-loss chalcogenide fiberscitations
- 2010Composition dependence and reversibility of photoinduced refractive index changes in chalcogenide glasscitations
- 2010Opto-electrophoretic detection of bio-molecules using conducting chalcogenide glass sensors.citations
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article
High refractive index IR lenses based on chalcogenide glasses molded by spark plasma sintering
Abstract
International audience ; In this work, spark plasma sintering is used to mold non conventional chalcogenide glasses of high refractive index at low temperature (andlt;400°C). This equipment, usually used for sintering refractory materials, is presented as efficient for both densification and high precision molding of IR transparent bulks and lenses of telluride glasses. Thermo-mechanical and optical characteristics of the selected Ge25Se10Te65 glass composition were investigated showing a refractive index of 3,12@10 µm and with however a limited resistance to crystallization. Mechanical milling of raw Ge, Se, Te elements leads to a major amorphous phase with the formation of a small proportion of GeTe crystals. Remaining GeTe crystals induce a fast crystallization rate during the sintering process leading to the opacity of the material. SPS flash moldings were then performed using melt quenched glass powders to produce complex lenses. It has been found that the critical parameter to reach optimal IR transparency is mainly the powder granulometry, which should be superior to 100 µm to prevent from MIE scatterings. The possibility of producing high refractive index infrared lenses has been demonstrated even with unstable glasses against crystallization. © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement