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Proceedings Paper

Through-the-jacket inscription of fiber Bragg gratings using femtosecond infrared radiation for sensor applications
Author(s): Stephen J. Mihailov; Dan Grobnic; Christopher W. Smelser; Robert B. Walker
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Paper Abstract

Silica-based fiber Bragg gratings (FBG) sensors are versatile devices that are typically fabricated using UV laser exposure. As most standard optical fiber polymer coatings are highly absorbing in the UV, grating inscription typically requires the removal and reapplication of the protective coating by either chemical or mechanical means. Optical fiber stripping and recoating are time-consuming processes that can seriously degrade the mechanical integrity of the fiber. For high temperature sensor applications (> 200 °C), the optical fiber is coated in polyimide which is resistant to chemical attack. Invasive and hazardous techniques for its removal are required such as hot sulphuric acid stripping. In this paper, results of FBG inscription directly through the polymer coating of standard optical fiber with a femtosecond infrared laser and a phase mask are reviewed. Significant grating reflectivities are achieved along with improved mechanical reliability and performance at elevated temperatures. The only example of direct FBG inscription through polyimide coatings for high temperature stable grating sensors will also be presented.

Paper Details

Date Published: 27 April 2009
PDF: 13 pages
Proc. SPIE 7316, Fiber Optic Sensors and Applications VI, 73160B (27 April 2009); doi: 10.1117/12.817836
Show Author Affiliations
Stephen J. Mihailov, Communications Research Ctr. Canada (Canada)
Dan Grobnic, Communications Research Ctr. Canada (Canada)
Christopher W. Smelser, Communications Research Ctr. Canada (Canada)
Robert B. Walker, Communications Research Ctr. Canada (Canada)

Published in SPIE Proceedings Vol. 7316:
Fiber Optic Sensors and Applications VI
Eric Udd; Henry H. Du; Anbo Wang, Editor(s)

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