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Proceedings Paper

Study on CO2 laser irradiation-induced mode coupling for development of miniaturized interferometric sensors
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Paper Abstract

There is a range of ways to couple light in a single mode fiber (SMF) from core mode to cladding modes, which can be applied in some fiber sensors. Recently, a very simple method using CO2 laser irradiation is put forward. By coupling core mode to cladding mode in the first irritation point and re-coupling in the second one, in-line Mach-Zehnder interferometer (MFI) and Michelson interferometer(MI) sensors have be demonstrated. To understand the mechanism underneath this coupling phenomenon, several parameters (laser power, laser lasting time, etc) tests are investigated. With bigger laser power and longer lasting time, one can obtain higher mode coupling, which is potential for greater sensitivity sensor. Combined with a long period fiber grating (LPFG), the cladding modes promoted in fiber cladding are studied. In some big power conditions, permanent deformation can be met on the irradiation points of the fiber. Although higher loss is induced, there is also other advantage, such like high temperature stability. The sensitivity and stability of temperature are discussed based on these sensors' configuration and mechanism. The experiences verify our laser irritation sensors can survive in very high temperature. When coating with some gas absorption film such like zeolite film, one reliable high sensitivity gas sensor is successfully demonstrated in low ppm vapor level.

Paper Details

Date Published: 30 April 2009
PDF: 9 pages
Proc. SPIE 7322, Photonic Microdevices/Microstructures for Sensing, 73220J (30 April 2009); doi: 10.1117/12.818915
Show Author Affiliations
Xinwei Lan, Missouri Univ. of Science and Technology (United States)
Tao Wei, Missouri Univ. of Science and Technology (United States)
Xiling Tang, Univ. of Cincinnati (United States)
Yinan Zhang, Missouri Univ. of Science and Technology (United States)
Junhang Dong, Univ. of Cincinnati (United States)
Hai Xiao, Missouri Univ. of Science and Technology (United States)

Published in SPIE Proceedings Vol. 7322:
Photonic Microdevices/Microstructures for Sensing
Hai Xiao; Xudong Fan; Anbo Wang, Editor(s)

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