Double fitting of Maker fringes to characterize near-surface and bulk second-order nonlinearities in poled silica

作者：Mingxin Qiu, R. Vilaseca, Muriel Botey, J. Sellarès, Francesc Pi, G. Orriols · 发表于：Applied Physics Letters · 年份：2000 · DOI：10.1063/1.126643 · 被引用次数：18 · 研究领域：Glass properties and applications、Photorefractive and Nonlinear Optics、Photonic Crystals and Applications

An experimental analysis of the distribution and thickness of the bulk nonlinearity induced in poled silica is reported. The second-order susceptibility decreases exponentially from the anodic interface. Maker fringe patterns showing a double structure are interpreted in relation to the presence of two nonlinear profiles, one concentrated near the anodic surface and another extending into the bulk of the sample. The Maker fringe theory is properly generalized and a double fitting technique reproducing well the experimental results is used to characterize the induced nonlinearities. The dependence of the second-harmonic signal on the poling temperature is given, which is different from that of sol-gel silica.