Alkali metal sulfate: A new non-π-conjugated deep-ultraviolet quasi-phase matching crystal. (August 2022)

• Record Type: Journal Article
• Authors: Sha, Hongyuan; Xu, Junxin; Huang, Lingxiong; Xiong, Zheyao; Wang, Zujian; Su, Rongbing; He, Chao; Yang, Xiaoming; Long, Xifa
• Is Part Of: Scripta materialia. Number 217(2022)
• Publication Date: 2022-08
• Subjects: Quasi-Phase Matching -- Crystal Structure -- Ferroelectricity -- Optical Materials; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114764
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Nonlinear optical crystals with ferroelectricity could realize frequency conversion based on the quasi-phase matching principal, which could effectively break the limitation of the inherent birefringence. Here, an alkali metal sulfate crystal, LiKSO4, is found, which combines a short absorption cutoff edge of 160 nm, a large second harmonic generation response of 4 × KH2 PO4 and the typical ferroelectric polarization reversal into a single structure. Besides, it possesses an optimized Sr2 Be2 B2 O7 -like structure with -S-O-Li- bonds in the adjacent layers, which effectively avoids the layer growth tendency. Therefore, this manuscript provides the first sulfate deep-ultraviolet quasi-phase matching crystal, which opens a new horizon for the development of deep-ultraviolet nonlinear optical materials. Graphical abstract: Image, graphical abstract