High-temperature behavior of femtosecond FBGs in molten-core glass optical fibers
We demonstrate the thermal stability of femtosecond laser-inscribed fiber Bragg gratings (FBGs) in all-glass fibers fabricated via the molten-core method (MCM), using aluminosilicate, alumino-zirconate, and YAG-based core compositions. These novel fibers exhibit sustained FBG reflection up to 1200°C, which is an improvement of 100°C over standard SMF-28. Thermal degradation of void FBGS in molten-core fiber was analyzed via the Variable Reaction Pathways (VAREPA) framework, yielding activation energy distributions through a master curve formalism. These results highlight the potential of Al<sub>2</sub>O<sub>3</sub>-rich fibers for high-temperature sensing. This work provides a foundation for the development of robust fiber-based sensors for use in aerospace, nuclear, and industrial high-temperature environments.
Authors
- Matthieu Lancry (ORCID: https://orcid.org/0000-0003-2007-7438)
- Michael J. Withford (ORCID: https://orcid.org/0000-0002-6414-8739)
- Thomas Hawkins (ORCID: https://orcid.org/0000-0003-2921-0004)
- John Ballato
- Martin Ams (ORCID: https://orcid.org/0000-0002-4359-0480)
- Sauvik Kashyap (ORCID: https://orcid.org/0000-0002-0456-3770)
- Maxime Cavillon (ORCID: https://orcid.org/0000-0002-2377-6114)
- Lachlan Anderson
Institutions
- Université Paris-Saclay (FR)
- UNSW Sydney (AU)
- Clemson University (US)
Publication Details
- Journal
- Optics Letters
- Published
- 2025-12-08
- DOI
- https://doi.org/10.1364/ol.582291
- Primary Topic
- Advanced Fiber Optic Sensors
- Type
- article
- Field-Weighted Citation Impact
- 0.00