Abstract
Mid−infrared (MIR) nonlinear optical (NLO) material is critical to laser frequency−conversion technology. Although the main commercial MIR NLO crystals (AgGaS2 AgGaSe2 and ZnGeP2) are practically used, they still have some intrinsic drawbacks, so that it is of great scientific significance to discover new materials with good MIR NLO performances. Among the main systems of chalcogenides to explore MIR NLO crystals, metal thiophosphates and selenophosphates are competitive for their structural diversities and strong covalent P−Q bonds. Here, Ag4P2Se6 (P212121) was selected to evaluate the second−order harmonic generation (SHG) property. As a result, the SHG response with phase−matching ability is about 0.5 times that of AgGaS2 at 2.05 μm in the particle range of 210–270 μm, and the laser damage threshold (LDT) is larger than that of AgGaS2. Remarkably, this compound is of low melt temperature of 642 °C with a congruent melting character, also possesses excellent chemical stability, facilitating its further crystal growth and fabrication.
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