Researchers from the Fujian Institute of Research on the Structure of Matter have discovered a magnesium-based phosphate compound, Mg2PO4Cl, that exhibits the highest second-harmonic generation (SHG) response among deep-ultraviolet (DUV) nonlinear optical (NLO) crystals without π-conjugated elements. This compound achieves an SHG response 5.2 times stronger than potassium dihydrogen phosphate (KDP), with a cutoff edge at 179 nm. The research team, led by Professors Zhu Qilong and Lin Hua, employed a “polar-axial-symmetry screening” strategy to enhance performance. They found that the effective stacking of functional motifs and alignment of non-bonding electrons along the polar axis contributed to the compound’s superior optical properties. These findings could advance the design of NLO crystals and improve understanding of structure-property relationships in this field.
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