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Proceedings Paper

Multi-curvities femtosecond laser aided microstructures for magnetic field sensing
Author(s): Joseph Muna Karanja; Yutang Dai; Xian Zhou; Bin Liu
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Paper Abstract

Magnetic sensors utilizing direct magneto-optic field coupling in an optical fiber Bragg grating (FBG) is proposed and demonstrated. The FBG’s cladding is micro-machined into micro-curvities aided by femtosecond laser, and coated with TbDyFe, magnetic sensing element. Number of micro-curvities and laser energy under a laser beam were optimized during FBG micromachining and dramatically improved sensor performance. Six-micro-groove sensor is four times more sensitive as compared to non-micro-grooved standard FBG sample. The effect of 18 mW laser pulse power impacted magnetic sensitivity of magnitude 0.6 pm/mT as compared to 0.14 pm/mT on non-microstructured standard FBG sensor. The depth of the deposited magnetostrictive film was measured as ~5 μm.

Paper Details

Date Published: 22 August 2015
PDF: 5 pages
Proc. SPIE 9656, International Symposium on Photonics and Optoelectronics 2015, 96560J (22 August 2015); doi: 10.1117/12.2196989
Show Author Affiliations
Joseph Muna Karanja, Wuhan Univ. of Technology (China)
Pwani Univ. (Kenya)
Yutang Dai, Wuhan Univ. of Technology (China)
Xian Zhou, Wuhan Univ. of Technology (China)
Bin Liu, Wuhan Univ. of Technology (China)


Published in SPIE Proceedings Vol. 9656:
International Symposium on Photonics and Optoelectronics 2015
Zhiping Zhou, Editor(s)

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