Chi Yang, Sun Zong-Dong, Xu Qian-Ting, Xue Huai-Guo, Guo Sheng-Ping
School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, P. R. China.
ACS Appl Mater Interfaces. 2020 Apr 15;12(15):17699-17705. doi: 10.1021/acsami.9b23085. Epub 2020 Apr 3.
The balance between second harmonic generation (SHG) intensity and laser-induced damage threshold (LIDT), together with phase-matchable behavior, is the key point for exploration of novel nonlinear optical (NLO) materials. In this work, the NLO property of defect wurtzite-type hexagonal-InSe (γ) is extensively explored first. It exhibits a strong SHG intensity of 2.6 × AgGaS (AGS) at 2.1 μm, and a high powder LIDT of 7.3 × AGS. From wurtzite to γ-InSe, the birefringence changes from 0.003 to 0.075, resulting in the phase-matchable phenomenon of γ-InSe. This is well ascribed to the contribution of the unique InSe unit in γ-InSe from the result of birefringence calculation and analysis.
二次谐波产生（SHG）强度与激光诱导损伤阈值（LIDT）之间的平衡，以及相位匹配行为，是探索新型非线性光学（NLO）材料的关键点。在这项工作中，首先对缺陷纤锌矿型六方相-InSe（γ）的NLO性质进行了广泛研究。它在2.1μm处表现出2.6×AgGaS（AGS）的强SHG强度，以及7.3×AGS的高粉末LIDT。从纤锌矿相到γ-InSe，双折射从0.003变为0.075，导致γ-InSe出现相位匹配现象。这很好地归因于双折射计算和分析结果中γ-InSe中独特InSe单元的贡献。
