26 April 1989 The Role Of Hydrogen In Pure Silica Optical Fibers Exposed To Co-60 Radiation At -55°C
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Abstract
Hydrogen plays a significant role in the response to ionizing radiation and subsequent recovery kinetics of pure silica optical fibers near 0.85 μm, especially noticeable at low temperature and low transmitted optical powers . Under these conditions recovery is controlled by the diffusion of molecular hydrogen. This hydrogen may be derived either from radiolytic decomposition of hydroxyl groups present as impurities, or, in the case of low-OH silica fibers, from previous exposure to hydrogen gas. Identification of compounds formed during and after irradiation suggests types of defect centers associated with radiation-induced optical attenuation. Spectroscopic analysis before and after irradiation of as-received and hydrogen impregnated, low-OH fibers from 0.4 to 1.6 μm reveals that SiH is formed both during low-temperature irradiation and the subsequent recovery, that there is more than one 'simple' absorption band, and that these bands are not equally suppressed by hydrogen impregnation.
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Brian D. Evans, "The Role Of Hydrogen In Pure Silica Optical Fibers Exposed To Co-60 Radiation At -55°C", Proc. SPIE 0992, Fiber Optics Reliability: Benign and Adverse Environments II, (26 April 1989); doi: 10.1117/12.960036; https://doi.org/10.1117/12.960036
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