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Coupled irradiation-temperature effects on induced point defects in germanosilicate optical fibers

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Abstract

We investigated the combined effects of temperature and X-rays exposures on the nature of point defects generated in Ge-doped multimode optical fibers. Electron paramagnetic resonance (EPR) results on samples X-ray irradiated at 5 kGy(SiO2), employing different temperatures and dose rates, are reported and discussed. The data highlight the generation of the Ge(1), Ge(2), E′Ge and E′Si defects. For the Ge(1) and Ge(2), we observed a decrease in the induced defect concentrations for irradiation temperatures higher than ~450 K, whereas the E′ defects feature an opposite tendency. The comparison with previous post-irradiation thermal treatments reveals peculiar effects of the temperature increase during the irradiation. Such difference, confirmed also by online radiation-induced attenuation measurements, has to be considered for practical use of these fibers in a mixed environment. Importantly, even if post-irradiation fading should be considered, the Ge(1) and Ge(2) concentrations measured by postmortem EPR experiments in room-temperature-irradiated samples are quite representative of the concentrations induced in the temperature range 230–450 K regardless of the investigated dose rate. The enhancement of the E′ content can be related to the simultaneous generation of this defect with non-bridging oxygen hole center from strained bonds implying a relevant modification of the defects generation/formation processes in the host glass matrix.

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Acknowledgements

We acknowledge the members of the Laboratory of Advanced Materials Physics (LAMP) group (http://www.unipa.it/lamp/) for support with interesting discussions.

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Authors and Affiliations

  1. Laboratoire H. Curien, UMR CNRS 5516, Univ Lyon, 18 rue du Pr. Benoît Lauras, 42000, Saint-Etienne, France

    A. Alessi, S. Girard, D. Di Francesca, I. Reghioua, A. Boukenter & Y. Ouerdane

  2. Dipartimento di Fisica e Chimica, Università di Palermo, 90123, Palermo, Italy

    S. Agnello & M. Cannas

  3. CERN, 1211, Geneva 23, Switzerland

    D. Di Francesca

  4. CEA, DAM, DIF, 91297, Arpajon, France

    C. Marcandella, P. Paillet & N. Richard

  5. Materials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270, Ajdovscina, Slovenia

    L. Martin-Samos

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  1. A. Alessi
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Correspondence to A. Alessi.

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Alessi, A., Agnello, S., Girard, S. et al. Coupled irradiation-temperature effects on induced point defects in germanosilicate optical fibers. J Mater Sci 52, 10697–10708 (2017). https://doi.org/10.1007/s10853-017-1244-x

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