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LiBX2(B=Ga,In;X=S,Se,Te)晶体具有宽的透光波段、足够大的双折射率、高的激光损伤阈值和小的双光子吸收系数等特性,是目前最具发展前景的中红外波段频率转换材料之一。本文从晶体结构入手,重点介绍了LiBX2晶体的光学性能、缺陷结构及晶体应用的最新研究成果。LiBX2晶体在二次谐波(SHG)相位匹配、差频产生(DFG)、光学参量放大(OPA)和光学参量振荡(OPO)等方面具有重要的应用前景。通过对晶体的透过光谱、吸收光谱、光致发光光谱和电子辐照的研究可以确定缺陷类型、缺陷浓度及最佳退火温度,分析晶体颜色与晶体组成和缺陷的关系。最后,提出LiBX2晶体今后应重点开展的研究方向,即获得更高光学质量的大尺寸晶体、降低晶体残余吸收和设计性能优良的抗反射膜(AR)。
The crystal of LiBX2 (B = Ga, In; X = S, Se, Te) has the characteristics of wide light transmission band, sufficient birefringence, high laser damage threshold and small two-photon absorption coefficient Prospects of the mid-infrared band frequency conversion materials. This article starts with the crystal structure, focusing on the optical properties of LiBX2 crystal, defect structure and the latest research results of crystal applications. LiBX2 crystal has important application prospects in phase matching of second harmonic (SHG), DFG, OPA and OPO. Through the study of the transmission, absorption, photoluminescence spectra and electron irradiation of the crystal, the type of defect, the concentration of the defect and the optimum annealing temperature can be determined. The relationship between the crystal color and the crystal composition and the defect is analyzed. Finally, the research direction of LiBX2 crystal should be put forward in the future, namely obtaining large-size crystals with higher optical quality, reducing the residual absorption of crystal and designing anti-reflection film (AR) with excellent performance.