Effect of radiation and temperature on high temperature resistant fiber bragg gratings

Thomas Blanchet, Romain Cotillard, Adriana Morana, Rudy Desmarchelier, Emmanuel Marin, Youcef Ouerdane, Aziz Boukenter, Damien Fourmentel, Stéphane Breaud, Andrei Goussarov, Christophe Destouches, Sylvain Girard, Guillaume Laffont

    Research outputpeer-review


    Fiber Bragg gratings can be used to monitor temperature or strain in harsh environments. We investigate the effect of Xrays on type III gratings - also called void gratings -which are known for their capacity to withstand high temperatures. The tested gratings are inscribed in a SMF28 germanosilicate optical fiber using the point-by-point method and a frequency-doubled Yb femtosecond laser emitting at 515 nm. The tested FBGs are separated in two groups depending on their reflectivity levels (Low/High). Half of each group is pre-annealed at a temperature of 750°C during 30 min. We have irradiated all the gratings up to 100 kGy(SiO2) at a dose-rate of 10 Gy/s at two different irradiation temperatures: 25°C and 150°C. For all the irradiations, the grating radiation response is identical independently of the chosen writing and preannealing conditions. When the irradiation is performed at 25°C, a Bragg wavelength shift of 10 pm is observed for all the gratings, which represents an error of less than 1°C at the total dose of 100 kGy while at 150°C the Bragg peak shift only of less than 4 pm corresponding to an error of 0.3°C.
    Original languageEnglish
    Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
    Subtitle of host publicationOptical Sensing and Detection VII 2022
    StatePublished - 15 May 2022
    Event2022 - SPIE Photonics Europe: Optical Sensing and Detection VII - Strasbourg
    Duration: 9 May 202215 May 2022

    Publication series

    NameOptical Sensing and Detection
    ISSN (Print)0277-786X


    Conference2022 - SPIE Photonics Europe
    Abbreviated titleSPIE

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