Temperature and polarization dependence of radiation-induced attenuation in pure-silica-core PANDA optical fiber

• Published in: Optical materials Vol. 131; p. 112510
• Main Authors: Kashaykin, P.F., Pospelova, E.A., Sharonova, Yu.O., Vokhmyanina, O.L., Azanova, I.S., Tomashuk, A.L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-09-2022
• Subjects: PANDA; Polarization-maintaining fiber; Pure-silica fiber; Radiation-induced attenuation; Temperature dependence; Temperature dependence; Pure-silica fiber; Radiation-induced attenuation; Polarization-maintaining fiber; PANDA
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2022.112510

Radiation-induced attenuation (RIA) spectra (700–1700 nm) in a pure-silica-core PANDA fiber were measured during and after γ-irradiation at room temperature (RT), −60 °C, and liquid nitrogen temperature (LNT) with the probe light polarization directed along each principal axis. The RIA difference between the polarizations was found to be largest at −60 °C, smaller at LNT and smallest at RT. At −60 °C, RIA for light codirected with the slow axis (RIAslow) proved to be greater than RIAfast throughout the spectrum, the RIA difference at λ = 1550 nm being 15% at the end of irradiation at a dose of 1 kGy (0.80 Gy/s) and increasing to 51% already in 10 min of post-irradiation recovery. RIAslow and RIAfast spectra measured at −60 °C were decomposed into RIA bands due to different types and classes of self-trapped holes (STHs) in the silica network. The origin of the RIA difference at λ = 1550 nm was thus explained in terms of the specific STH bands, of which the amplitudes turned out to be polarization dependent.
•Absorption of some self-trapped holes in PANDA fiber can be polarization dependent.•Polarization along the slow axis of pure-silica-core PANDA fiber gives higher RIA.•RIA anisotropy is non-monotonic with temperature.•RIA anisotropy in pure-silica-core PANDA fiber can be great in space applications.