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Sensors 2011, 11(1), 54-61; doi:10.3390/s110100054

A High-Quality Mach-Zehnder Interferometer Fiber Sensor by Femtosecond Laser One-Step Processing

1
School of Mechanical Engineering, Beijing Institute of Technology, 100081, China
2
Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
3
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
4
Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
*
Author to whom correspondence should be addressed.
Received: 14 October 2010 / Revised: 15 November 2010 / Accepted: 16 December 2010 / Published: 23 December 2010
(This article belongs to the Section Physical Sensors)
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Abstract

During new fiber sensor development experiments, an easy-to-fabricate simple sensing structure with a trench and partially ablated fiber core is fabricated by using an 800 nm 35 fs 1 kHz laser. It is demonstrated that the structure forms a Mach-Zehnder interferometer (MZI) with the interference between the laser light passing through the air in the trench cavity and that in the remained fiber core. The fringe visibilities are all more than 25 dB. The transmission spectra vary with the femtosecond (fs) laser ablation scanning cycle. The free spectral range (FSR) decreases as the trench length increases. The MZI structure is of very high fabrication and sensing repeatability. The sensing mechanism is theoretically discussed, which is in agreement with experiments. The test sensitivity for acetone vapor is about 104 nm/RIU, and the temperature sensitivity is 51.5 pm/°C at 200 ~ 875 °C with a step of 25 °C. View Full-Text
Keywords: femtosecond laser; fiber sensors; Mach-Zehnder interferometer femtosecond laser; fiber sensors; Mach-Zehnder interferometer
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Zhao, L.; Jiang, L.; Wang, S.; Xiao, H.; Lu, Y.; Tsai, H.-L. A High-Quality Mach-Zehnder Interferometer Fiber Sensor by Femtosecond Laser One-Step Processing. Sensors 2011, 11, 54-61.

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