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1 April 2022 Harnessing filament arrays for azimuthally resolved displacement sensing in fiber Bragg gratings
Abdullah Rahnama, Hossein Mahlooji, Gligor Djogo, Fae Azhari, Peter R. Herman
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Proceedings Volume PC11991, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXII; PC119910L (2022) https://doi.org/10.1117/12.2609171
Event: SPIE LASE, 2022, San Francisco, California, United States
Abstract
A point-by-point femtosecond laser fabrication technique was used to form filament arrays inside single-mode telecommunication fiber. The off-axis positioning of the grating from the neutral axis was key to enabling displacement optical sensing in single mode fiber. Optomechanical responses were enhanced with stress concentration in cantilevered optical fiber. The narrow geometry of the filament array facilitated sensing of a uniform strain field induced by the lateral displacement, or to null the response when filaments were orthogonally oriented. In this way, filament gratings could be overlaid for azimuthally resolved displacement sensing. The ability to measure transverse displacements paves the way toward developing more efficient optical accelerometers.
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Abdullah Rahnama, Hossein Mahlooji, Gligor Djogo, Fae Azhari, and Peter R. Herman "Harnessing filament arrays for azimuthally resolved displacement sensing in fiber Bragg gratings", Proc. SPIE PC11991, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXII, PC119910L (1 April 2022); https://doi.org/10.1117/12.2609171
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KEYWORDS
Fiber Bragg gratings
Sensors
Single mode fibers
Cladding
Femtosecond phenomena
Optical fibers
Optical resolution
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