{"id":7892,"date":"2024-09-13T11:30:34","date_gmt":"2024-09-13T08:30:34","guid":{"rendered":"https:\/\/quantum-electronics.ru\/en\/?p=7892"},"modified":"2024-09-13T13:41:30","modified_gmt":"2024-09-13T10:41:30","slug":"radiation-resistance-of-fibre-bragg-gratings-under-intense-reactor-irradiation","status":"publish","type":"post","link":"https:\/\/quantum-electronics.ru\/en\/radiation-resistance-of-fibre-bragg-gratings-under-intense-reactor-irradiation\/","title":{"rendered":"Radiation resistance of fibre Bragg gratings under intense reactor irradiation"},"content":{"rendered":"<p>P. F. Kashaykin, S. A. Vasil\u2019ev, A. L. Tomashuk, A. D. Ignat\u2019ev, V. A. Britskii, A. A. Shaimerdenov, A. M. Akhanov, P. P. Silnyagin, T. V. Kulsartov<\/p>\n<ul>\n<li>Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk<\/li>\n<li>Fiber Optics Research Center of the Russian Academy of Sciences<\/li>\n<li>&#8220;FORC &#8211; Photonics&#8221; group, Moscow<\/li>\n<\/ul>\n<div class=\"around-button\"><b>Abstract:<\/b> 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\u00d710<sup>20<\/sup> neutron\u00b7cm<sup>\u20132<\/sup> (a flux density of 2.87\u00d710<sup>14<\/sup> neutron\u00b7cm<sup>\u20132<\/sup>s<sup>\u20131<\/sup>) and gamma radiation doses of 2.3\u00d710<sup>9<\/sup> Gy (a dose rate of 1.4 kGy\u00b7s<sup>\u20131<\/sup>). 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\u20133.4 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 \u223c1.5%), 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 (\u223c10 \u03bcm), 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 (\u223c2 dB\u00b7cm<sup>\u20131<\/sup>).<\/div>\n<div><\/div>\n<div class=\"around-button\"><b>Keywords:<\/b> <i>fibre Bragg gratings, radiation resistance, radiation-induced absorption of light, reactor irradiation<\/i><\/div>\n<div><\/div>\n<div><b>Received:<\/b> 16.09.2022<br \/>\n<b>Revised:<\/b> 24.10.2022<br \/>\n<b>Accepted:<\/b> 24.10.2022<\/div>\n","protected":false},"excerpt":{"rendered":"<p>P. F. Kashaykin, S. A. Vasil\u2019ev, A. L. Tomashuk, A. D. Ignat\u2019ev, V. A. Britskii, A. A. Shaimerdenov, A. M. Akhanov, P. P. Silnyagin, T. V. Kulsartov Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk Fiber Optics Research Center of the Russian Academy of Sciences &#8220;FORC &#8211; Photonics&#8221; group, Moscow\u2026 <span class=\"read-more\"><a href=\"https:\/\/quantum-electronics.ru\/en\/radiation-resistance-of-fibre-bragg-gratings-under-intense-reactor-irradiation\/\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3075,3076,3073,3074,1774,1773,1778,1769,1779],"class_list":["post-7892","post","type-post","status-publish","format-standard","hentry","category-stats","tag-a-a-shaimerdenov","tag-a-m-akhanov","tag-p-f-kashaykin","tag-v-a-britskii","tag-a-d-ignatev","tag-a-l-tomashuk","tag-p-p-silnyagin","tag-s-a-vasilev","tag-t-v-kulsartov"],"_links":{"self":[{"href":"https:\/\/quantum-electronics.ru\/en\/wp-json\/wp\/v2\/posts\/7892","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quantum-electronics.ru\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quantum-electronics.ru\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quantum-electronics.ru\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/quantum-electronics.ru\/en\/wp-json\/wp\/v2\/comments?post=7892"}],"version-history":[{"count":0,"href":"https:\/\/quantum-electronics.ru\/en\/wp-json\/wp\/v2\/posts\/7892\/revisions"}],"wp:attachment":[{"href":"https:\/\/quantum-electronics.ru\/en\/wp-json\/wp\/v2\/media?parent=7892"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantum-electronics.ru\/en\/wp-json\/wp\/v2\/categories?post=7892"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantum-electronics.ru\/en\/wp-json\/wp\/v2\/tags?post=7892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}