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Proceedings Paper

Long period grating response to gamma radiation
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Paper Abstract

We report the evaluation of one long period grating (LPG) and one fiber Bragg grating (FBG) under gamma irradiation. The LPG was produced by the melting-drawing method based on CO2 laser assisted by a micro-flame and was engraved in a commercial single mode fiber SMF28 from Corning, grating length 25 mm, grating pitch of 720 μm. After the manufacturing of the grating, the fiber was re-coated with Acrylate and the grating was inserted into special ceramic case transparent to gamma radiation. The FBG is commercialized by Technica SA, and it is written in SMF-28 optical fiber (λ= 1546 nm; grating length of 12 mm; reflectivity > 80 %; bandwidth – BW @3 dB < 0.3 nm; side lobe suppress ratio – SLSR >15 dB; Acrylate recoating). By on-line monitoring of the LPG wavelength deep with an optical fiber interrogator during the irradiation exposure and pauses, both the irradiation induced shift (maximum 1.45 nm) and the recovery (in the range of 200 pm) phenomena were observed. Temperature sensitivity of the LPS was not affected by gamma irradiation.

Paper Details

Date Published: 27 April 2016
PDF: 7 pages
Proc. SPIE 9886, Micro-Structured and Specialty Optical Fibres IV, 98861P (27 April 2016); doi: 10.1117/12.2230233
Show Author Affiliations
Dan Sporea, National Institute for Laser, Plasma and Radiation Physics (Romania)
Andrei Stӑncalie, National Institute for Laser, Plasma and Radiation Physics (Romania)
Daniel Neguţ, Horia Hulubei National Institute of Physics and Nuclear Engineering (Romania)
Sylvie Delepine-Lesoille, ANDRA (France)
Laurent Lablonde, iXBlue (France)

Published in SPIE Proceedings Vol. 9886:
Micro-Structured and Specialty Optical Fibres IV
Kyriacos Kalli; Alexis Mendez, Editor(s)

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