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• W2067340345 abstract "Photosensitive, germanium-doped multicomponent silicate glasses with different amount of boron oxide and sodium oxide were prepared and investigated by means of electron paramagnetic resonance (EPR) and ultraviolet–visible (UV–Vis) spectroscopy in order to investigate the structural changes occurring in the glasses under UV laser irradiation at 248 nm (KrF excimer UV laser). Spectral data were recorded before and after UV laser irradiation: all the glasses showed EPR signals only after UV laser irradiation, independently from the presence of a UV–Vis absorption band on the as prepared glasses. The main results showed that the presence or the absence of boron and sodium and their amount play a role in the type and the number of defects, their time and thermal decay, under the same UV laser exposure conditions. A clear correlation between the EPR signal and the UV–Vis absorption is observed only for the 240 nm band. It is also demonstrated that the sodium ions decrease the number of paramagnetic defects in these glasses and deeply change the germano-silicate glass structure. The presence, the absence and the co-presence of sodium and boron ions has a role in the structure, the number, the nature and the stability of the paramagnetic defects. It is important to understand the role of sodium and boron in order to increase the photosensitivity of germano-silicate glasses, for their interest in the field of ion-exchangeable glasses for photonic waveguides and Bragg-grating based devices." @default.
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• W2067340345 date "2006-07-01" @default.
• W2067340345 modified "2023-09-27" @default.
• W2067340345 title "EPR and UV–Vis characterization of multicomponent germano-silicate glasses for photonics" @default.
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• W2067340345 doi "https://doi.org/10.1016/j.jnoncrysol.2006.02.035" @default.
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