Optimized arrangement of non-π-conjugated PO3NH3 units leads to enhanced ultraviolet optical nonlinearity in NaPO3NH3
The key to achieving nonlinear optical (NLO) crystals with superior optical properties lies in the development of new high-performance functional units and their precise arrangement. In this study, we identify the polar covalent tetrahedron (PO3NH3)−, with its remarkable optical properties, as a novel deep-ultraviolet (DUV) NLO-active unit for the first time. To ensure the (PO3NH3)− units are accurately aligned, we selected NaNH4PO3F·H2O as a template. Subsequently, we successfully synthesized NaPO3NH3, wherein the (PO3NH3)− units were arranged in an orderly manner. This excellent ordered arrangement of (PO3NH3)− units enables NaPO3NH3 to exhibit not only a significant SHG effect (1.2 × KDP), but also the largest birefringence (0.062@546.1 nm) among DUV non-π-conjugated phosphate systems.
危险品化学品经营许可证（带存储）