{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,21]],"date-time":"2026-04-21T16:29:01Z","timestamp":1776788941658,"version":"3.51.2"},"reference-count":37,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2017,11,2]],"date-time":"2017-11-02T00:00:00Z","timestamp":1509580800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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 \u00b5m. 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.<\/jats:p>","DOI":"10.3390\/s17112519","type":"journal-article","created":{"date-parts":[[2017,11,3]],"date-time":"2017-11-03T04:43:13Z","timestamp":1509684193000},"page":"2519","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":89,"title":["Femtosecond FBG Written through the Coating for Sensing Applications"],"prefix":"10.3390","volume":"17","author":[{"given":"Jo\u00e9","family":"Habel","sequence":"first","affiliation":[{"name":"Center for Optics, Photonics, and Lasers (COPL), Universit\u00e9 Laval, Qu\u00e9bec, QC G1K 7P4, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tommy","family":"Boilard","sequence":"additional","affiliation":[{"name":"Center for Optics, Photonics, and Lasers (COPL), Universit\u00e9 Laval, Qu\u00e9bec, QC G1K 7P4, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jean-Simon","family":"Freni\u00e8re","sequence":"additional","affiliation":[{"name":"Center for Optics, Photonics, and Lasers (COPL), Universit\u00e9 Laval, Qu\u00e9bec, QC G1K 7P4, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0817-5115","authenticated-orcid":false,"given":"Fran\u00e7ois","family":"Tr\u00e9panier","sequence":"additional","affiliation":[{"name":"TeraXion Inc., Qu\u00e9bec, QC G1P 4S8, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martin","family":"Bernier","sequence":"additional","affiliation":[{"name":"Center for Optics, Photonics, and Lasers (COPL), Universit\u00e9 Laval, Qu\u00e9bec, QC G1K 7P4, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2017,11,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"647","DOI":"10.1063\/1.89881","article-title":"Photosensitivity in optical waveguides: Application to reflection filter fabrication","volume":"32","author":"Hill","year":"1978","journal-title":"Appl. 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