Abstract
AbstractFor the first time, the polar covalent tetrahedron [SO2(NH2)2] is revealed as a new deep‐ultraviolet (DUV) nonlinear optical (NLO)‐active unit according to theoretical calculations. Furthermore, sulfamide consisting of polar [SO2(NH2)2] units was confirmed as an excellent candidate as a DUV NLO crystal. Sulfamide provides the optimal balance between composition, structure, and properties, in addition to a very short absorption of 160 nm. It achieves multiple optical performance records for non‐π‐conjugated DUV NLO materials, including the strongest second harmonic generation (SHG) efficiency (about 4 times that of KDP), the largest birefringence (obv.: 0.07@589.3 nm) and the shortest SHG wavelength predicted as 188 nm.
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