非線形光学結晶LiBGeO<sub>4</sub>からなる新規透明結晶化ガラス

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  • New Transparent Crystallized Glasses with Optical Nonlinear LiBGeO4 Crystals.

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Crystallization behaviors of the glass with a composition of 25Li2O⋅25B2O3⋅50GeO2 corresponding to lithium borogermanate LiBGeO4 have been examined. It has been confirmed that the LiBGeO4 crystalline phase is formed at the surface of heat-treated glasses. The second harmonic (SH) generation is found from transparent surface crystallized glasses, demonstrating for the first time that the LiBGeO4 phase shows optical nonlinearity. The SH intensity of LiBGeO4 crystallites (powdered state) prepared through crystallization is about ten times as large as that of pulverized α-quartz. The SH intensity of transparent crystallized glasses (bulk state) with crystalline layers of 3-4.5μm thickness increases with increasing heat treatment temperature (540-560°C) and, time (1-6h), and the maximum SH intensity among the samples studied is in the order of 1/10 in comparison with that of α-quartz single crystal. The transparent crystallized glass obtained by heat treatment at 550°C for 3h exhibits a clear and fine Maker fringe pattern, indicating a highly orientation of LiBGeO4 crystals at the surface.

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