Open AccessMagnetic field sensor based on fiber Bragg grating with a spiral microgroove ablated by femtosecond laser
Author(s) -
Yutang Dai,
Minghong Yang,
Gang Xu,
Yinquan Yuan
Publication year - 2013
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.21.017386
Subject(s) - materials science , fiber bragg grating , optics , phosfos , femtosecond , magnetic field , cladding (metalworking) , grating , laser , fiber laser , optical fiber , optoelectronics , fiber optic sensor , polarization maintaining optical fiber , physics , composite material , quantum mechanics
A novel magnetic field sensor based on Terfenol-D coated fiber Bragg grating with spiral microstructure was proposed and demonstrated. Through a specially-designed holder, the spiral microstructure was ablated into the fiber Bragg grating (FBG) cladding by femtosecond laser. Due to the spiral microstructure, the sensitivity of FBG coated with magnetostrictive film was enhanced greatly. When the spiral pitch is 50 μm and microgroove depth is 13.5 μm, the sensitivity of the magnetic field sensor is roughly 5 times higher than that of non-microstructured standard FBG. The response to magnetic field is reversible, and could be applicable for magnetic field detection.