Temperature-insensitive refractive index sensor based on an optical fiber extrinsic Fabry–Perot interferometer processed by a femtosecond laser  

作　　者：刘鹏飞 姜澜 王素梅 曹志涛 王鹏 

机构地区：[1]Laser Micro/Nano Fabrication Laboratory,School of Mechanical Engineering,Beijing Institute of Technology

出　　处：《Chinese Optics Letters》2016年第2期11-15,共5页中国光学快报（英文版）

基　　金：supported by the National Basic Research Program of China (No.2011CB013000);the 863 Program of the Ministry of Science and Technology of China (No.2015AA043504);the Cultivation Fund of the Key Scientific and Technical Innovation Project,Ministry of Education of China (No.708018)

摘　　要：An optical fiber extrinsic Fabry-Perot interferometer （EFPI） is designed and fabricated for refractive index （RI） sensing. To test the RI of liquid, the following two different methods are adopted： the wavelength tracking method and the Fourier-transform white-light interferometry （FTWLI）. The sensitivities of sensors with cavity lengths of 288.1 and 358.5 μm are 702.312 nm/RIU and 396.362 μm/RIU, respectively, by the two methods. Our work provides a new kind of RI sensor with the advantages of high sensitivity, mechanical robustness, and low cross sensitivity to temperature. Also, we provide a new method to deal with gold film with a femtosecond laser.An optical fiber extrinsic Fabry-Perot interferometer （EFPI） is designed and fabricated for refractive index （RI） sensing. To test the RI of liquid, the following two different methods are adopted： the wavelength tracking method and the Fourier-transform white-light interferometry （FTWLI）. The sensitivities of sensors with cavity lengths of 288.1 and 358.5 μm are 702.312 nm/RIU and 396.362 μm/RIU, respectively, by the two methods. Our work provides a new kind of RI sensor with the advantages of high sensitivity, mechanical robustness, and low cross sensitivity to temperature. Also, we provide a new method to deal with gold film with a femtosecond laser.

关 键 词：FABRY Perot interferometers Fiber optic sensors INTERFEROMETERS Optical fiber fabrication Optical fibers REFRACTOMETERS Ultrashort pulses 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]