Abstract
Radiation-induced attenuation (RIA) is investigated in pure-silica-core optical fibers (PSFs) upon their pulsed-X-ray irradiation. RIA at small post-pulse times (t ≤ 0.001–0.1 s) is argued to be mainly due to inherent self-trapped holes (STHs), whereas at large times, due to strain-assisted STHs, as shown by Girard et al. Significant suppression of inherent STHs is found to occur in PSFs upon pulsed pre-irradiation with a dose of just ∼100–200 Gy. Thus, a radiation-hardening effect is revealed for the first time, which is of practical value for PSFs to be exposed to pulsed irradiation. Fiber drawing temperature Td is found to have an essential effect on RIA upon pulsed irradiation. The optimal Td-values are estimated for PSF applications at small (t < 0.01 s) and large (t > 0.01 s) post-pulse times.
© 2018 IEEE
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