Next Article in Journal
Analysis of Different Feature Selection Criteria Based on a Covariance Convergence Perspective for a SLAM Algorithm
Previous Article in Journal
Femtosecond Laser Filamentation for Atmospheric Sensing
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,* , 1
Received: 14 October 2010 / Revised: 15 November 2010 / Accepted: 16 December 2010 / Published: 23 December 2010
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [444 KB, uploaded 21 June 2014]   |   Browse Figures


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.
Keywords: femtosecond laser; fiber sensors; Mach-Zehnder interferometer femtosecond laser; fiber sensors; Mach-Zehnder interferometer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
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.

View more citation formats

Related Articles

Article Metrics

For more information on the journal, click here


Cited By

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert