Middle-infrared Second-order Nonlinear Optical Chalcogenides and Halides Containing Multiple Anions

The second-order nonlinear optical(NLO)materials play an important role in the application and development of laser techniques.For various candidates,those in the middle infrared(MIR)region are far from the market’s requirement.Therefore,it is necessary to explore new ones with better performance.For their exploration,the inclusion of multiple anions in one structure has been proved to be a successful strategy.The NLO property contains several aspects,and different anions may contribute to different aspects.Therefore,the multiple anions’combination may give an opportunity to obtain NLO materials with desirable properties.Here,we make a short but clear summary on the MIR NLO-active chalcogenides and halides containing multiple anions,as most of them exhibit nice NLO performances.