Gamma-radiation-induced attenuation of light in polarization-maintaining pure-silica-core PANDA fibers

Pavel F. Kashaykin; Alexander L. Tomashuk; Irina S. Azanova; Olga L. Vokhmyanina; Tatiana V. Dimakova; Igor A. Maltsev; Yulia O. Sharonova; Elena A. Pospelova; Evgeni M. Dianov

doi:10.1117/12.2520430

16 April 2019 Gamma-radiation-induced attenuation of light in polarization-maintaining pure-silica-core PANDA fibers

Pavel F. Kashaykin, Alexander L. Tomashuk, Irina S. Azanova, Olga L. Vokhmyanina, Tatiana V. Dimakova, Igor A. Maltsev, Yulia O. Sharonova, Elena A. Pospelova, Evgeni M. Dianov

Author Affiliations +

Proceedings Volume 11029, Micro-structured and Specialty Optical Fibres VI; 110290V (2019) https://doi.org/10.1117/12.2520430
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

Radiation-induced attenuation (RIA) of light is studied in a pure-silica-core Panda fiber under γ-irradiation in the dose range 1-10⁶ Gy at the dose rates in the range 0.015-5 Gy/s. A 5-mW erbium fiber superluminescent source or a white-light lamp (integral power of <0.5 μW) are used as the probe light source. Both RIA dose dependences at separate wavelengths in the near-IR range and RIA spectra in the near-IR and visible ranges at fixed doses are investigated. The spectra are Gaussian deconvolved and analyzed. 1.55-μm light (500 μW) is found to produce photobleaching not only of the 0.95- and 1.12-eV RIA bands, the effect observed previously, but also of the 2.6- and 1.63-eV RIA bands associated with inherent and strain-assisted self-trapped holes (STHs), respectively. RIA at λ=1.55 μm is found not to depend on dose rate at those below 0.15 Gy/s, which opens up the possibility to simply estimate the upper bound of RIA gained by the end of space mission. In particular, the RIA upper bound at λ=1.55 μm of ~1.5 dB/km is predicted for a 1-kGy space mission. RIA at λ=1.55 μm in pure-silica-core Pandas is also found to cease to depend on dose rate and probe light power at high doses (~10⁵ Gy). The reason is that all the short-lived RCCs sensitive to the former parameters completely disappear at high doses, whereas RIA at λ=1.55 μm becomes wholly determined by the long-wavelength RIA band peaking at λ<1.7 μm and known to be dose-rate-independent and photobleaching-insensitive.

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Pavel F. Kashaykin, Alexander L. Tomashuk, Irina S. Azanova, Olga L. Vokhmyanina, Tatiana V. Dimakova, Igor A. Maltsev, Yulia O. Sharonova, Elena A. Pospelova, and Evgeni M. Dianov "Gamma-radiation-induced attenuation of light in polarization-maintaining pure-silica-core PANDA fibers", Proc. SPIE 11029, Micro-structured and Specialty Optical Fibres VI, 110290V (16 April 2019); https://doi.org/10.1117/12.2520430

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