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 × KH2PO4 and the typical ferroelectric polarization reversal into a single structure. Besides, it possesses an optimized Sr2Be2B2O7-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.
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