Title :
Fiber In-Line Michelson Interferometer Tip Sensor Fabricated by Femtosecond Laser
Author :
Liao, Changrui R. ; Wang, D.N. ; Wang, Min ; Yang, Minghong
Author_Institution :
Dept. of Electr. Eng., Hong Kong Polytech. Univ., Hong Kong, China
Abstract :
A fiber in-line Michelson interferometer tip sensor based on open micro-cavity, which is fabricated by femtosecond laser micromachining and the thin film coating technique, is proposed and demonstrated. When used in refractive index sensing, such an interferometer operates in a reflection mode of detection, and exhibits a compact sensor head, good mechanical reliability, wide operation range, and high sensitivity of 975 nm/refractive index unit at a refractive index value of 1.484.
Keywords :
Michelson interferometers; fibre optic sensors; high-speed optical techniques; laser beam machining; micro-optics; microcavities; micromachining; optical fibre fabrication; optical films; refractive index; reliability; compact sensor head; femtosecond laser micromachining; fiber in-line Michelson interferometer tip sensor; mechanical reliability; open micro-cavity; reflection mode; refractive index sensing; thin film coating technique; wavelength 975 nm; Cavity resonators; Fiber lasers; Optical fiber sensors; Refractive index; Sensitivity; Femtosecond laser; Michelson interferometer; fiber sensor;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2219517
