High-temperature behavior of femtosecond FBGs in molten-core glass optical fibers
Year: 2025
Type: article
Abstract: 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 2 O 3 —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.
Source: Optics Letters
DOI: 10.1364/ol.582291
Authors: Lachlan Anderson, Shreyas J. Kashyap, Maxime Cavillon, Thomas W. Hawkins, Martin Ams, Michael Withford, John Ballato, Matthieu Lancry
Institutions: Université Paris-Saclay, UNSW Sydney, Clemson University
Language: English
Topic: Advanced Fiber Optic Sensors
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Funder: Agence Nationale de la Recherche
OpenAlex ID: W4417130596