Strong refractive index changes induced in Ag ion exchanged Er doped phosphate glass using 248 nm excimer laser radiation
Pissadakis, S., Ikiades, A., Hua, Ping, Sheridan, A.K. and Wilkinson, J.S. (2005) Strong refractive index changes induced in Ag ion exchanged Er doped phosphate glass using 248 nm excimer laser radiation. European Journal of Glass Science and Technology Part A, 46, (2), 76-79.
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The photosensitivity of a commercial phosphate glass (Schott IOG-I), which is doped with Er^3+ 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 ultraviolet 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/cm^2 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.
|Subjects:||Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
|Divisions:||University Structure - Pre August 2011 > Optoelectronics Research Centre
|Date Deposited:||10 Aug 2007|
|Last Modified:||25 Apr 2013 15:45|
|Contact Email Address:||firstname.lastname@example.org|
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