新型硫族化合物在中红外非线性光学晶体方面研究进展

Research progress of new chalcogenides in mid-infrared nonlinear optical crystals

利用红外非线性光学晶体材料对已有的成熟的激光光源进行频率转换是获得3～5μm和8～12μm＂大气窗口＂红外激光的主要方法。传统的红外非线性光学晶体存在缺陷,不能满足应用要求,需要探索新型的红外材料。综述了以硫族化合物为研究对象,寻找新型中红外非线性光学晶体材料的研究进展。介绍了Li MQ2（M=Ga,In;Q=S,Se,Te）,BaGa4S7,BaGa4Se7,BaGa2MQ6（M=Si,Ge;Q=S,Se）及Li2In2MQ6（M=Si,Ge;Q=S,Se）的研究进展。

The frequency conversion of existed laser sources using infrared nonlinear optical（NLO）crystals is the main way to generate 3-5μm and 8-12μm＂atmospheric windows＂infrared sources.The traditional infrared nonlinear optical crystals have shortcomings of one kind or another which seriously limits their applications and cannot meet the application requirements.Therefore,it is practically and scientifically important to study and search for new infrared NLO crystals.In this paper,an overview on the progress of searching for new infrared NLO crystals in chalcogenides was presented.The new development in the growth and characterization of Li MQ2（M=Ga,In;Q=S,Se,Te）,BaGa4S7,BaGa4Se7,BaGa2MQ6（M=Si,Ge;Q=S,Se）,and Li2In2MQ6（M=Si,Ge;Q=S,Se）was reported.