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Fiber In-Line Michelson Interferometer Tip Sensor Fabricated by Femtosecond Laser

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4 Author(s)
Changrui R. Liao ; Department of Electrical Engineering, Hong Kong Polytechnic University, Hong Kong ; D. N. Wang ; Min Wang ; Minghong Yang

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.

Published in:

IEEE Photonics Technology Letters  (Volume:24 ,  Issue: 22 )