Improvement of Radiation Resistance of Pure Silica Core Fibers by Hydrogen Treatment

Authors:
  • KNKaya Nagasawa
    Kaya Nagasawa
  • YHYutaka Hoshi
    Yutaka Hoshi
  • YOYoshimichi Ohki
    Yoshimichi Ohki
  • KYKichinosuke Yahagi
    Kichinosuke Yahagi
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Abstract
A pure silica core fiber with glass cladding is known to produce larger absorption in the visible wavelength region under γ-ray irradiation than a similar fiber with silicone cladding. This absorption is a serious problem, especially in image-guiding fibers used in radiation environments such as in nuclear power plants. The absorption is attributed to the formation of defect centers such as non-bridging oxygen hole centers and E' centers induced by bond scission. A new and simple method of hydrogen treatment to improve the radiation resistance of an optical fiber with a pure silica core has been proposed. Post-treatment by this method can significantly reduce existing radiation-induced absorption, while preliminary treatment can suppress the increase of the radiation-induced absorption.

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