Radiation Resistance of Fiber Bragg Gratings under Intense Reactor Irradiation
Kashaykin P.F. Vasiliev S.A. Tomashuk A.L. Ignatyev A.D. Britskii V.A. Shaimerdenov A.A. Akhanov A.M. Silnyagin P.P. Kulsartov T.V.
September 2023Pleiades Publishing
Bulletin of the Lebedev Physics Institute
2023#50S322 - S328 pp.
Abstract: Radiation-induced attenuation (RIA) of light and radiation-induced shift (RIS) of the resonant wavelength in fiber Bragg gratings (FBGs) during reactor irradiation up to a neutron fluence of 4.8 × 1020 neutron/cm2 (flux density 2.87 × 1014 neutron cm–2 s–1) and gamma dose of 2.3 × 109 Gy (dose rate 1.4 kGy/s) are studied. The FBGs were fabricated by femtosecond writing in radiation-resistant optical fibers (OFs) with an undoped silica glass core, as well as by UV writing in a standard germanosilicate OFs (SMF-28). The RIS of the resonant wavelength of the grating was 2.5–3.4 nm for all studied samples (except FBGs with a polyimide coating), which, apparently, is due to radiation-induced compaction of the silica glass matrix. In FBGs written through a polyimide coating, an anomalously large RIS was found in the short-wavelength spectral region (by ~1.5%), which linearly depended on the neutron fluence. Such a large shift, apparently, is due to the shrinkage of the polyimide coating under exposure to intense gamma-neutron radiation at high temperature in vacuum, which, even at a small coating thickness (~10 μm), leads to a significant compression of the region of the OF with the grating. Experiments have shown that, under such intense radiation, FBGs written in radiation-resistant optical fibers with a protective copper coating are preferable for practical use; FBGs with a polyimide coating can presumably be regarded as dosimeters; and germanosilicate fibers with FBGs are unsuitable due to significant RIS (~2 dB/cm).
fiber Bragg gratings , radiation resistance , radiation-induced attenuation of light , reactor irradiation
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Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation
Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center, Moscow, 119991, Russian Federation
FORC-Photonics Ltd., Moscow, 117246, Russian Federation
Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Institute of Automation and Electrometry
Prokhorov General Physics Institute of the Russian Academy of Sciences
FORC-Photonics Ltd.
Institute of Nuclear Physics
Al-Farabi Kazakh National University
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