Metal chalcogenides are charming candidates for nonlinear optical (NLO) materials due to their multiply functional structure units and large polarizability. Here, isostructural Sn-based chalcogenides BaZnSnQ4 (Q = S, Se) were...
factor beneficial for increasing bandgap and LIDT usually tend to decrease the NLO coefficient. [5] MIR NLO crystals are important components for outputting MIR lasers. However, according to these requirements, AGS and ZGP cannot satisfy the increasing market's needs in view of their low LIDTs and harmful doublephoton absorption. [6] Therefore, how to maintain the balance between high LIDT and strong NLO response is the main concern for researchers in this field. After years of exploration, MIR NLO materials with superior comprehensive properties are still scarce. Therefore, the discovery of novel ones with balanced comprehensive properties is urgent while challenging.Hitherto, MIR NLO materials are mainly metal chalcogenides, and also several mixed-anionic materials, such as oxyhalides
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