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Large Second Harmonic Generation (SHG) Effect and High Laser‐Induced Damage Threshold (LIDT) Observed Coexisting in Gallium Selenide
Author(s) -
Guo ShengPing,
Cheng Xiyue,
Sun ZongDong,
Chi Yang,
Liu BinWen,
Jiang XiaoMing,
Li ShuFang,
Xue HuaiGuo,
Deng Shuiquan,
Duppel Viola,
Köhler Jürgen,
Guo GuoCong
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201902839
Subject(s) - second harmonic generation , orthorhombic crystal system , laser , phase (matter) , high harmonic generation , materials science , second harmonic imaging microscopy , phase matching , harmonic , optics , optoelectronics , diffraction , chemistry , physics , quantum mechanics , organic chemistry
A big challenge for nonlinear optical (NLO) 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). Herein we report the preparation of a new Ga 2 Se 3 phase, which shows the SHG intensities of around 2.3 times and the LIDT of around 16.7 times those of AgGaS 2 (AGS), respectively. In addition, its IR transparent window ca. 0.59–25 μm is also significantly wider than that of AGS (ca. 0.48–≈11.4 μm). The occurrence of the strong SHG responses and good phase‐matching indicate that the structure of the new Ga 2 Se 3 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.