Impact of electron irradiation upon optical properties of Bismuth/Yttria codoped phosphosilicate fiber. (August 2020)

• Record Type: Journal Article
• Authors: Kir'yanov, A.V.; Halder, A.; Sekiya, E.; Saito, K.; Barmenkov, Y.O.; Minkovich, V.P.; Didenko, S.I.; Legotin, S.A.; Tapero, K.I.
• Is Part Of: Optics & laser technology. Volume 128(2020)
• Publication Date: 2020-08
• Subjects: Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2020.106245
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: Changes in Bi-doped fiber properties after irradiation by electron beam are studied. Waveguide properties of Bi-doped fiber in pristine and irradiated states are modeled. Ways to use Bi-doped fiber for dosimetry in harsh environments are proposed. Stokes shift of cutoff wavelength vs . exposure dose is discovered for Bi-doped fiber. Abstract: We report the changes in absorption and emission properties of Bismuth/Yttria codoped phosphosilicate fiber which arise after bombardment by a beam of high-energy (β) electrons. Despite dramatic rise of induced absorption in the fiber as the result of β-irradiation, reaching ~2000 dB/m in the visible, we reveal its remarkable resistance, at doses of exposure up to ~10 14 cm −2, in terms of the emissive potential in the visible / near-IR and photo-bleaching contrast at pump wavelengths falling into the absorption bands of Bismuth active centers. Also, we uncover a novel effect of large spectral shift to the Stokes side (up to ~75 nm), experienced by the cutoff wavelength of the fiber in function of β-irradiation dose due to notable refractive index rise in its core region.