Abstract
High temperature fibre Bragg gratings (FBGs) are essential for certain harsh environment sensing applications. Unlike traditional UV-written type I FBGs, femtosecond laser written silica FBGs can offer higher thermal stability >1000 °C [1, 2]. Here, we investigate different fs-laser FBG inscription parameters to not only achieve high temperature stability, but also explore the FBG structural and spectral changes in the less-well studied extreme temperature (1300 °C) softening and failure regime, including by tapering the heated FBGs.
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