1. Cs2GeB409: a New Second-Order Nonlinear-Optical Crystal.
- Author
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Xiang Xu, Hu, Chun-Li, Fang Kong, Zhang, Jian-Han, Mao, Jiang-Gao, and Junliang Sun
- Subjects
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CESIUM , *GERMANIUM compounds , *NONLINEAR optics , *CRYSTAL optics , *ALKALI metals , *CRYSTAL structure - Abstract
A new alkali-metal borogermanate with noncentrosymmetric structure, namely, Cs2GeB409, has been discovered, and a large crystal with dimensions of 20 × 16 × 8 mm(3) has been grown by a high-temperature top-seeded solution method using Cs2O-B2O2 as a flux. The compound crystallizes in the tetragonal space group I4 with a = b = 6.8063(2) Å, c = 9.9523(7) Å, V = 461.05(4) Å3, and Z = 2. It features a three-dimensional anionic open framework based on GeO4 tetrahedra and B4O9 clusters that are interconnected via corner-sharing, forming one-dimensional channels of nine-/ten-membered rings along the a and b axes, which are occupied by Cs+ cations. Cs2GeB409 exhibits a very high thermal stability with a melting point of 849 °C, and it possesses a short-wavelength absorption edge onset at 198 nm determined by UV-vis transmission spectroscopy measurements on a slab of polished crystal. Powder second-harmonic generation (SHG) measurement on sieved crystals reveals that Cs2GeB409 is a type I phase-matchable material with a strong SHG response of about 2.8 × KH2PO4. The preliminary investigation indicates that Cs2GeB409 is a new promising second-order nonlinear-optical crystalline material. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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