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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
Published on: May 27, 2013
Rare-Earth/d10 Dual-Metal Oxychalcogenides as Infrared Nonlinear-Optical Materials
Fang-Xu Tian1, Nan Zhang2, Wen-Dong Yao2
1Yunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Material and Energy, Yunnan University, Kunming, Yunnan 650500, P. R. China.
Abstract:
Oxychalcogenides are receiving increasing interest as nonlinear-optical (NLO) materials because of the possible combination of advantages from oxides and chalcogenides. Here, two new pentanary oxythiogermanates Eu2MGe2OS6 [M = Zn (1), Cd (2)] were obtained by the facile metal oxide-boron-sulfur solid-state route. They crystallize with a melilite-type structure and feature {[MGe2OS6]4-}∞ layers built by Ge2OS6 dimers and MS4 tetrahedra. Their optical band gaps are 2.37 and 2.38 eV. As the first NLO rare-earth (RE)/d10 dual-metal oxychalcogenides, they exhibit phase-matchable NLO responses and enhanced laser-induced damage thresholds. Theoretical calculations show that the NLO responses are predominantly contributed by the EuOS7 motifs. This work provides the potential of RE/d10 dual-metal-based NLO materials.
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