Open AccessIn-situ non-contact high-temperature measurement of an optical fiber up to the glass softening point
Author(s) -
Korbinian Mühlberger,
C. M. Harvey,
Michael Fokine
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.417175
Subject(s) - optics , materials science , fiber bragg grating , optical fiber , interferometry , fiber laser , fiber optic sensor , phosfos , polarization maintaining optical fiber , laser , temperature measurement , graded index fiber , physics , quantum mechanics
The optical fiber itself can function as a partially reflecting concentric cavity interferometer when transversely probed by a focused laser beam. In this study, the thermal response of the fiber heated by a CO 2 -laser beam was characterized by monitoring the back-scattered interference pattern. Simultaneous measurement of the Bragg wavelength shift of an inscribed, high-temperature stable fiber Bragg grating allowed for calibration of the temperature-dependent phase response of the interferometer. The presented technique allows for in-situ non-contact temperature measurements up to the glass softening point.