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This article is cited in 1 scientific paper (total in 1 paper)
Selection of papers presented at the International Workshop on Fibre Lasers (Novosibirsk, 15-19 August 2022) (Compiled and edited by S.L. Semjonov and S.A. Babin)
Radiation resistance of fibre Bragg gratings under intense reactor irradiation
P. F. Kashaykinab, S. A. Vasil'evb, A. L. Tomashukb, A. D. Ignat'evc, V. A. Britskiic, A. A. Shaimerdenov, A. M. Akhanov, P. P. Silnyagin, T. V. Kulsartov a Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk
b Fiber Optics Research Center of the Russian Academy of Sciences
c "FORC - Photonics" group, Moscow
Abstract:
We study radiation-induced absorption (RIA) of light and radiation-induced shift (RIS) of a resonant wavelength in fibre Bragg gratings (FBGs) during reactor irradiation up to a neutron fluence of 4.8×1020 neutron·cm–2 (a flux density of 2.87×1014 neutron·cm–2s–1) and gamma radiation doses of 2.3×109 Gy (a dose rate of 1.4 kGy·s–1). The FBGs are fabricated by femtosecond writing in radiation-resistant optical fibres with an undoped silica glass core, as well as by UV writing in a standard germanosilicate fibre (SMF-28). The RIS of the resonant wavelength of the grating is 2.5–3.4 nm for all the studied samples (with the exception of FBGs with a polyimide coating), which, apparently, is due to radiation densification of the silica glass network. The gratings written through the polyimide coating exhibit an anomalously large RIS in the short-wavelength region of the spectrum (by ∼1.5%), which depends linearly on the neutron fluence. Such a large shift is apparently due to the shrinkage of the polyimide coating in the case of exposure to intense gamma-neutron radiation at high temperature and in vacuum, which, even at a small coating thickness (∼10 μm), leads to a significant compression of the fibre region with the grating. The performed experiments demonstrate that, under such intense radiation exposure, FBGs written in radiation-resistant optical fibres with a protective copper coating are preferable for practical use, FBGs with a polyimide coating can presumably be considered as dosimeters, and germanosilicate fibres with FBGs are unsuitable due to significant RIA (∼2 dB·cm–1).
Keywords:
fibre Bragg gratings, radiation resistance, radiation-induced absorption of light, reactor irradiation.
Received: 16.09.2022 Revised: 24.10.2022 Accepted: 24.10.2022
Citation:
P. F. Kashaykin, S. A. Vasil'ev, A. L. Tomashuk, A. D. Ignat'ev, V. A. Britskii, A. A. Shaimerdenov, A. M. Akhanov, P. P. Silnyagin, T. V. Kulsartov, “Radiation resistance of fibre Bragg gratings under intense reactor irradiation”, Kvantovaya Elektronika, 52:11 (2022), 1007–1011 [Bull. Lebedev Physics Institute, 50:suppl. 3 (2023), S322–S328]
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https://www.mathnet.ru/eng/qe18193 https://www.mathnet.ru/eng/qe/v52/i11/p1007
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Abstract page: | 81 | References: | 18 | First page: | 14 |
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