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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Strong refractive index changes induced in Ag+ ion exchanged er doped phosphate glass using 248nm excimer laser radiation

Sheridan, A.K. and Wilkinson, J.S. and Ping, Hua and Ikiades, A. and Pissadakis, S. (2005) Strong refractive index changes induced in Ag+ ion exchanged er doped phosphate glass using 248nm excimer laser radiation. Glass Technology, 46 (2). pp. 76-79.

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Abstract

The photosensitivity of a commercial phosphate glass (Schott IOG-I), which is doped with Er3+ ions and has been ion exchanged with Ag+ ions, was examined using nanosecond 248 nm excimer laser radiation. Grating structures were inscribed in the untreated and ion exchanged Er doped IOG-l glass by employing phase mask interference in contact mode. The dependence of ultravioiet induced refractive index changes upon the ion exchanged Ag+ concentration and the number of ultraviolet pulses was studied using diffraction efficiency measurements. Refractive index changes in untreated glasses are of the order of 10-5, whereas for silver ion exchanged samples they reach ~2.0 x 10-3, for ultraviolet exposures of 30000 pulses of 400mJ/cm2 energy density. Measurements of the absorption spectra of exposed and unexposed samples were carried out in order to reveal absorption bands and illustrate photosensitivity mechanisms. Furthermore, energy dispersive spectrum microanalysis and scanning electron microscopy of the exposed ion exchanged glass samples reveal that ultraviolet radiation induces migration of the Ag+ ions towards the areas of high energy density.