Formation of fresnoite-type Ba_2TiGe_2O_8 crystallites in BaO-TiO_2-GeO_2 glass thin film and its optical nonlinearity(<Feature>Glass and Ceramic Materials for Photonics)

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We report on fabrication of the BaO-TiO_2-GeO_2 glass thin films on a fused silica substrate by RF sputtering, and investigation of the crystallization behavior, surface texture and the optical non-linearity in the glass thin film by means of AFM, XRD, Raman and Maker fringe techniques. Although the Ba_2TiGe_2O_8, hereafter abbreviated to BTG, phase with second-order optical nonlinearity was mainly crystallized, the precipitation of the sub-phase of BaGe_4O_9 was also confirmed in the heat-treated glass thin films. In the glass thin film heat-treated at heat-treatment temperature (T_<HT>)=730-750℃, the (211) preferential orientation of BTG phase and an upheaval about 300-400nm were confirmed at the surface. These transparent crystallized glass thin films indicated a clearly Maker fringe patterns, demonstrating a second-order optical nonlinearity, and the effective second-order nonlinear optical constant, d_<eff>, was estimated to be〜0.8pm/V.
社団法人日本セラミックス協会の論文
2008-10-01