DocumentCode :
80823
Title :
Femtosecond Laser Ablated FBG Multitrenches for Magnetic Field Sensor Application
Author :
Karanja, Joseph Muna ; Yutang Dai ; Xian Zhou ; Bin Liu ; Minghong Yang ; Jixiang Dai
Author_Institution :
Nat. Eng. Lab. for Fiber Opt. Sensing Technol., Wuhan Univ. of Technol., Wuhan, China
Volume :
27
Issue :
16
fYear :
2015
fDate :
Aug.15, 15 2015
Firstpage :
1717
Lastpage :
1720
Abstract :
Three-dimensional multitrench microstructures, femtosecond laser ablated in fiber Bragg grating (FBG) cladding, TbDyFe sputtered is proposed and demonstrated for magnetic field sensing probe. Parameters such as the number of straight microtrenches, translation speed (feed rate), and laser pulse power of laser beam have been systematically varied and optimized. A 5-μm-thick giant Terfenol-D magnetostrictive film is sputtered on to FBG microtrenches, and acts as magnetic sensing transducer. Eight microtrench samples produced the highest central wavelength shift of 120 pm, nearly fivefold more sensitive compared with nonmicrostructured standard FBG. An increase in laser pulse power to 20 mW generated the magnetic sensitivity of 0.58 pm/mT. Interestingly, reduction in translational speed contributed dramatically to the rise in the magnetic sensitivity of the samples. These sensor samples show magnetic response reversibility and have great potential in the magnetic field sensing domain.
Keywords :
Bragg gratings; fibre optic sensors; high-speed optical techniques; laser ablation; laser beams; magnetic field measurement; magnetic sensors; magnetostrictive devices; micro-optics; microsensors; optical fibre cladding; optimisation; sputtering; transducers; FBG multitrenches; TbDyFe sputtering; Terfenol-D magnetostrictive film; feed rate; femtosecond laser ablation; fiber Bragg grating cladding; laser beam; laser pulse power; magnetic field sensing probe; magnetic field sensor application; magnetic response reversibility; magnetic sensing transducer; magnetic sensitivity; optimization; power 20 mW; size 5 mum; three-dimensional multitrench microstructures; translation speed; Fiber gratings; Fiber lasers; Magnetic fields; Magnetostriction; Optical fiber sensors; Optical fibers; Optical fiber transducers; laser ablation; magnetic field measurement; micromachining; thin films;
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2015.2438228
Filename :
7114251
Link To Document :
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