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Thermal Stability of Type II Modifications by IR Femtosecond Laser in Silica-based Glasses

Femtosecond (fs) laser written fiber Bragg gratings (FBGs) are excellent candidates for ultra-high temperature (>800 °C) monitoring. More specifically, Type II modifications in silicate glass fibers, characterized by the formation of self-organized birefringent nanostructures, are known to exhibi...

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Autores principales: Wei, Shu-En, Wang, Yitao, Yao, Heng, Cavillon, Maxime, Poumellec, Bertrand, Peng, Gang-Ding, Lancry, Matthieu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7038465/
https://www.ncbi.nlm.nih.gov/pubmed/32019146
http://dx.doi.org/10.3390/s20030762
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author Wei, Shu-En
Wang, Yitao
Yao, Heng
Cavillon, Maxime
Poumellec, Bertrand
Peng, Gang-Ding
Lancry, Matthieu
author_facet Wei, Shu-En
Wang, Yitao
Yao, Heng
Cavillon, Maxime
Poumellec, Bertrand
Peng, Gang-Ding
Lancry, Matthieu
author_sort Wei, Shu-En
collection PubMed
description Femtosecond (fs) laser written fiber Bragg gratings (FBGs) are excellent candidates for ultra-high temperature (>800 °C) monitoring. More specifically, Type II modifications in silicate glass fibers, characterized by the formation of self-organized birefringent nanostructures, are known to exhibit remarkable thermal stability around 1000 °C for several hours. However, to date there is no clear understanding on how both laser writing parameters and glass composition impact the overall thermal stability of these fiber-based sensors. In this context, this work investigates thermal stability of Type II modifications in various conventional glass systems (including pure silica glasses with various Cl and OH contents, GeO(2)-SiO(2) binary glasses, TiO(2)- and B(2)O(3)-doped commercial glasses) and with varying laser parameters (writing speed, pulse energy). In order to monitor thermal stability, isochronal annealing experiments (Δt⁓ 30 min, ΔT⁓ 50 °C) up to 1400 °C were performed on the irradiated samples, along with quantitative retardance measurements. Among the findings to highlight, it was established that ppm levels of Cl and OH can drastically reduce thermal stability (by about 200 °C in this study). Moreover, GeO(2) doping up to 17 mole% only has a limited impact on thermal stability. Finally, the relationships between glass viscosity, dopants/impurities, and thermal stability, are discussed.
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spelling pubmed-70384652020-03-09 Thermal Stability of Type II Modifications by IR Femtosecond Laser in Silica-based Glasses Wei, Shu-En Wang, Yitao Yao, Heng Cavillon, Maxime Poumellec, Bertrand Peng, Gang-Ding Lancry, Matthieu Sensors (Basel) Article Femtosecond (fs) laser written fiber Bragg gratings (FBGs) are excellent candidates for ultra-high temperature (>800 °C) monitoring. More specifically, Type II modifications in silicate glass fibers, characterized by the formation of self-organized birefringent nanostructures, are known to exhibit remarkable thermal stability around 1000 °C for several hours. However, to date there is no clear understanding on how both laser writing parameters and glass composition impact the overall thermal stability of these fiber-based sensors. In this context, this work investigates thermal stability of Type II modifications in various conventional glass systems (including pure silica glasses with various Cl and OH contents, GeO(2)-SiO(2) binary glasses, TiO(2)- and B(2)O(3)-doped commercial glasses) and with varying laser parameters (writing speed, pulse energy). In order to monitor thermal stability, isochronal annealing experiments (Δt⁓ 30 min, ΔT⁓ 50 °C) up to 1400 °C were performed on the irradiated samples, along with quantitative retardance measurements. Among the findings to highlight, it was established that ppm levels of Cl and OH can drastically reduce thermal stability (by about 200 °C in this study). Moreover, GeO(2) doping up to 17 mole% only has a limited impact on thermal stability. Finally, the relationships between glass viscosity, dopants/impurities, and thermal stability, are discussed. MDPI 2020-01-30 /pmc/articles/PMC7038465/ /pubmed/32019146 http://dx.doi.org/10.3390/s20030762 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wei, Shu-En
Wang, Yitao
Yao, Heng
Cavillon, Maxime
Poumellec, Bertrand
Peng, Gang-Ding
Lancry, Matthieu
Thermal Stability of Type II Modifications by IR Femtosecond Laser in Silica-based Glasses
title Thermal Stability of Type II Modifications by IR Femtosecond Laser in Silica-based Glasses
title_full Thermal Stability of Type II Modifications by IR Femtosecond Laser in Silica-based Glasses
title_fullStr Thermal Stability of Type II Modifications by IR Femtosecond Laser in Silica-based Glasses
title_full_unstemmed Thermal Stability of Type II Modifications by IR Femtosecond Laser in Silica-based Glasses
title_short Thermal Stability of Type II Modifications by IR Femtosecond Laser in Silica-based Glasses
title_sort thermal stability of type ii modifications by ir femtosecond laser in silica-based glasses
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7038465/
https://www.ncbi.nlm.nih.gov/pubmed/32019146
http://dx.doi.org/10.3390/s20030762
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