Wada, N., Morinaga, K., Takebe, H., Pruneri, V. and Kazansky, P.G.
Effect of minority species on thermal poling of used silica glasses.
In, Bragg Gratings, Photosensitivity and Poling in Glass Waveguides (BGPP), Williamsburg, US,
26 - 28 Oct 1997.
High second-order nonlinearity (SON) in poled silica glasses is of great interest for the development of linear electro-optic modulators and frequency converters monolithically integrated into optical fibres or planar glass waveguides. However, its origin is not fully understood. The extrinsic effects of poling time and voltage on second-harmonic (SH) generation in thermally-poled silica glass have been studied. In particular the quadratic dependence of the maximum SH signal on the applied voltage indicated linear dependence of the SON on internal electric field. There are several studies on intrinsic effects associated with defects and minority species such as OH and Na in thermal poling of silica glasses. In this work we carried out a systematic analysis of oxygen related defects and impurities (OH and Na) in commercial fused silica glasses (without relying on their catalogue data) and discuss their effects on SON
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