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Gamma Radiation Effects on the Optical Properties of Yb-doped Silicate Glasses

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Author(s): SHENG Yu-Bang, XING Rui-Xian, LUAN Huai-Xun, LIU Zi-Jun, LI Jin-Yan, DAI Neng-Li

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 8;
Start page: 860;
Date: 2012;
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Keywords: Yb-doped silicate glasses; radiation-induced absorption; valence conversion; color center fluorescence

ABSTRACT
A series of Yb-doped silicate glasses were prepared by a conventional melting method under normal processing conditions. The effects of gamma-ray (from a 60Co γ source) radiation on the absorption and emission properties of all glass samples were investigated. The radiation exposure leaded to the formation of color centers in glass samples. Such radiation-induced photodarkening caused a strong broad optical absorption band, which had a maximum wavelength centered at around 400 nm and the tail extended into the near infrared region. In addition, a minor part of the Yb3+ ions were converted into Yb2+ by trapping free electrons during irradiation based on the radiation induced absorption (RIA) spectra. The excitation energy could be transfered from Yb3+ ions to radiation-induced defects through cooperative upconversion or multiphoton absorption processes under 960 nm LD pumping. Such energy transfer processes resulted in a decrease of the upper state lifetime of Yb3+ ion which was accompanied by an increase in oxygen deficient center ODC(2) defect fluorescence at around 476 nm. Photobleaching effect was observed in irradiated Yb-doped glasses during the fluorescence measurement at room temperature.

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