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Radiation-induced absorption and luminescence in specially hardened large-core silica optical fibers

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10 Author(s)

Radiation-induced absorption and luminescence are measured in the visible spectral region in H2-loaded and as-drawn fibers with KU and KS-4V silicas in the core in the process of γ-irradiation ( 60Co-source). The induced absorption in H2-loaded fibers is shown to be much lower than in as-drawn fibers, at least up to 1.2 MGy. A `blue' band prevails in the luminescence spectra of all the fibers. Its intensity is greater in a KS-4V fiber than in a KU fiber. It is also somewhat greater in H2-loaded fibers than in unloaded ones, The luminescence lifetime in a KU fiber has been measured under excitation with a pulsed reactor to be 100 μs at λ=488 nm and 60 μs at λ=633 nm. It is concluded that the `blue' radioluminescence cannot be attributed either to relaxation of the oxygen-deficient center or to Cerenkov emission. A fabrication technology of radiation-hardened H2-containing fibers with a hermetic aluminum coating is reported. Such fibers appear to be the best candidates for various applications in radiation environments

Published in:

IEEE Transactions on Nuclear Science  (Volume:47 ,  Issue: 3 )