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Channel waveguides in ion-exchanged Pyrex by direct UV writing
A.K.Sheridan, C.B.E.Gawith, G.D.Emmerson, J.A.Milton, P.G.R.Smith, J.S.Wilkinson
In this paper, we show that UV irradiation can induce a significant refractive index change in Pyrex, a commercial oxide glass which does not contain the most common photosensitiser, germanium. We describe the fabrication of channel waveguides in potassium-ion exchanged Pyrex by UV writing and find the maximum UV-induced change in refractive index to be 1 x 10−3. UV-induced changes in the absorption spectrum are reported and attributed to the formation of defects from iron impurities inherent in the glass. A colour-centre-related model for the observed refractive index change is proposed.
Optics Communications (2004) Vol.242(1-3) pp.109-114
Copyright University of Southampton 2006