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LaBGeO5 single crystals in glass and second-harmonic generation |
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| Authors: | Yoshihiro Takahashi Kenji Kitamura Yasuhiko Benino Takumi Fujiwara Takayuki Komatsu |
| Affiliation: | aInternational Center for Young Scientists, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan bAdvanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan cDepartment of Chemistry, Nagaoka University of Technology, 1603-1 Nagaoka, Niigata 940-2188, Japan |
| Abstract: | Flower-shaped crystals with diameters of 100–200 μm consisting of LaBGeO5 (LBGO) single crystals similar to petals were observed in the interior of transparent LBGO surface-crystallized glasses. Each flower-shaped crystal was radially grown from the surface of the included bubbles. A more intense second-harmonic generation was observed from the LBGO crystallized glasses with the flower-shaped LBGO single crystals compared to the samples without such crystals based on the Maker fringe technique and second-harmonic (SH) generation microscopy. The SH intensity for the flower-shaped LBGO single crystals monotonically decreased with increasing temperature up to  350 °C, less than the Curie temperature reported so far (530 °C). It is considered that the internal compressive stress induced by the difference in the thermal expansion between the LBGO single crystal and the corresponding glass affect the ferroelectric property of the flower-shaped LBGO single crystals in glass. |
| Keywords: | LaBGeO5 Glass Crystallization Second-harmonic generation Nonlinear optical crystal |
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