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Sensors 2017, 17(11), 2519;

Femtosecond FBG Written through the Coating for Sensing Applications

Center for Optics, Photonics, and Lasers (COPL), Université Laval, Québec, QC G1K 7P4, Canada
TeraXion Inc., Québec, QC G1P 4S8, Canada
Author to whom correspondence should be addressed.
Received: 30 September 2017 / Revised: 28 October 2017 / Accepted: 31 October 2017 / Published: 2 November 2017
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors)
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Type I fiber Bragg gratings (FBG) written through the coating of various off-the-shelf silica fibers with a femtosecond laser and the phase-mask technique are reported. Inscription through most of the common coating compositions (acrylate, silicone and polyimide) is reported as well as writing through the polyimide coating of various fiber cladding diameters, down to 50 µm. The long term annealing behavior of type I gratings written in a pure silica core fiber is also reported as well as a comparison of the mechanical resistance of type I and II FBG. The high mechanical resistance of the resulting type I FBG is shown to be useful for the fabrication of various distributed FBG arrays written using a single period phase-mask. The strain sensing response of such distributed arrays is also presented. View Full-Text
Keywords: Fiber Bragg gratings; fiber sensors; ultrafast material processing Fiber Bragg gratings; fiber sensors; ultrafast material processing

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Habel, J.; Boilard, T.; Frenière, J.-S.; Trépanier, F.; Bernier, M. Femtosecond FBG Written through the Coating for Sensing Applications. Sensors 2017, 17, 2519.

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