title: Femtosecond Laser Ablated FBG with Composite Microstructure for Hydrogen Sensor Application.
abstract: A composite microstructure in fiber Bragg grating (FBG) with film deposition for hydrogen detection is presented. Through ablated to FBG cladding by a femtosecond laser, straight-trenches and spiral micro-pits are formed. A Pd-Ag film is sputtered on the surface of the laser processed FBG single mode fiber, and acts as hydrogen sensing transducer. The demonstrated experimental outcomes show that a composite structure produced the highest sensitivity of 26.3 pm/%H, nearly sevenfold more sensitive compared with original standard FBG. It offers great potential in engineering applications for its good structure stability and sensitivity.
authors.affiliation: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China. zoumeng209@163.com.
authors.forename: Meng
authors.initials: M
authors.lastname: Zou
authors.affiliation: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China. daiyt6688@whut.edu.cn.
authors.forename: Yutang
authors.initials: Y
authors.lastname: Dai
authors.affiliation: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China. chinazhoul@163.com.
authors.forename: Xian
authors.initials: X
authors.lastname: Zhou
authors.affiliation: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China. whutdongke@163.com.
authors.forename: Ke
authors.initials: K
authors.lastname: Dong
authors.affiliation: National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China. minghong.yang@whut.edu.cn.
authors.forename: Minghong
authors.initials: M
authors.lastname: Yang
keywords: fiber optics sensor; laser materials processing; thin films