Sheridan, A.K., Gawith, C.B.E., Emmerson, G.D., Milton, J.A., Smith, P.G.R. and Wilkinson, J.S.
Channel waveguides in ion-exchanged Pyrex by direct UV writing
Optics Communications, 242, (1-3), . (doi:10.1016/j.optcom.2004.08.014).
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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 × 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.
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