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New Strategy for Designing Promising Mid-Infrared Nonlinear Optical Materials: Narrowing Band Gap for Large Nonlinear Optical Efficiency and Reducing Thermal Effect for High Laser-induced Damage Threshold

Abstract

To circumvent the incompatibility between large nonlinear optical (NLO) efficiency and high laser-induced damage threshold (LIDT) in mid-infrared NLO materials, a new strategy for designing both excellent properties is proposed. This strategy involves narrowing band gap for large NLO efficiency and reducing thermal effect for high LIDT. To support of these proposals, a series of isostructural chalcogenides with various tetrahedral center cations, Na2Ga2MQ6 (M = Ge, Sn; Q = S, Se), were synthesized and studied in detail. Compared with the benchmark AGS, these chalcogenides exhibit significantly narrower band gaps (1.56–1.73 eV, AGS: 2.62 eV) and high NLO efficiencies (1.6–3.9 times that of AGS at 1910 nm), and also outstanding LIDTs of 8.5–13.3 × AGS for potential high-power applications, which are contrary to the conventional band gap view but can be attributed to their small thermal expansion anisotropy, surmounting the NLO-LIDT incompatibility. These results shed light on the exploration of practical IR NLO materials with excellent performance not restricted by the NLO–LIDT incompatibility.

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Publication details

The article was received on 14 Mar 2018, accepted on 09 May 2018 and first published on 16 May 2018


Article type: Edge Article
DOI: 10.1039/C8SC01210E
Citation: Chem. Sci., 2018, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    New Strategy for Designing Promising Mid-Infrared Nonlinear Optical Materials: Narrowing Band Gap for Large Nonlinear Optical Efficiency and Reducing Thermal Effect for High Laser-induced Damage Threshold

    S. Li, X. Jiang, Y. Fan, B. Liu, H. Zeng and G. Guo, Chem. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C8SC01210E

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