Hg₃AsS₄X (X = Cl and Br): two Hg-based chalcogenides as long-wave infrared nonlinear optical crystals with superior comprehensive performances

Abstract

Long-wave infrared (IR) nonlinear optical (NLO) crystals hold great promise for extensive applications. However, the IR NLO crystals with outstanding comprehensive optical and NLO performances are still in great demand....

A Congruent-Melt Infrared Nonlinear Optical Crystal Na4SrAs2S8

“…Recently, the metal thiophosphate/thioarsenate family as the branch of chalcogenides has received more attention due to their structural traits and performance virtues. − First, thiophosphates and thioarsenates can exhibit various crystal structures. The basic MS 4 (M = P or As) tetrahedral anion in the family can further form another M 2 S 6 anionic group via an edge-sharing connection. − Second, the strong M–S covalent bonds are profitable to obtain wide band gaps (or short ultraviolet cutoffs), accordingly resulting in high LIDTs .…”