SrZnSnSe$_4$: A quaternary selenide with large second harmonic generation and birefringence
Date
2022-02-08Author
Hou, Fengjuan
Mei, Dajiang
Zhang, Yiling
Liang, Fei
Wang, Jian
Lu, Jie
Lin, Zheshuai
Wu, Yuandong
Metadata
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Hou, F., Mei, D., Zhang, Y., Liang, F., Wang, J., Lu, J., . . . Wu, Y. (2022). SrZnSnSe$_4$: A quaternary selenide with large second harmonic generation and birefringence. Journal of Alloys and Compounds, 904 doi:10.1016/j.jallcom.2022.163944
Abstract
Infrared nonlinear optical (NLO) materials with great laser conversion efficient play a key role in military and civil fields. SrZnSnSe$_4$ was synthesized via replacing S elements with Se in SrZnSnS$_4$ compound. SrZnSnSe$_4$ crystallizes a two-dimensional layered structure with nearly parallel alignment of anionic groups [ZnSe$_4$] and [SnSe$_4$]. The experimental results show that the second harmonic generation (SHG) is about 5 times of AgGaS2, and the band gap of SrZnSnSe$_4$ is 1.82 eV by direct measured method. In combination with theoretical calculation, the SHG coefficients of SrZnSnSe$_4$ is d33 = 30.03 pm/V, and the birefringence is 0.290 at incident laser of 1240 nm, which can contribute to phase matching. These evidences show that SrZnSnSe$_4$ can balance well among band gap, frequency doubling effect and birefringence, therefore, it is an excellent candidate for infrared NLO materials.
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