Large SHG Effect and High LIDT Observed Coexisting in Gallium Selenide: a Simple but Perfect Case.

Author(s) Guo, S.P.; Cheng, X.; Sun, Z.D.; Chi, Y.; Liu, B.W.; Jiang, X.M.; Li, S.F.; Xue, H.G.; Deng, S.; Duppel, V.; Kӧhler, J.; Guo, G.C.
Journal Angew Chem Int Ed Engl
Date Published 2019 Apr 19

A big challenge for nonlinear optical materials is the application in high power lasers, which needs the simultaneous occurrence of large second harmonic generation (SHG) and high laser induced damage threshold (LIDT). This work reports the preparation of a new Ga2Se3 phase, which shows the SHG intensities of around 2.3 times and the LIDT of around 16.7 times those of AgGaS2 (AGS), respectively. In addition, its IR transparent window ~0.59 -- ~25 μm is also significantly wider than that of AGS (~0.48 -- ~11.4 μm). The occurrence of the strong SHG responses and the good phase-matching property indicate that the structure of the new Ga2Se3 phase can only be non-centrosymmetric and have a lower symmetry than the cubic γ-phase. The observed excellent SHG and phase-matching properties are consistent with our diffraction experiments and can be well explained by using the orthorhombic models obtained through our high throughput simulations.

DOI 10.1002/anie.201902839
ISSN 1521-3773
Citation Angew Chem Int Ed Engl. 2019.

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