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对一个含Pb的混合卤化物Pb_7F_(12)Br_2进行了合成及单晶结构与性能测试,并首次对它的各种与非线性光学材料相关的主要性能进行了研究。发现该化合物的光学带隙宽达4.32 e V,粉末激光损伤阈值为25 MW·cm-2,远高于同等测试条件下商品化红外非线性光学晶体材料AgGaS_2的粉末激光损伤阈值(<5.2 MW·cm-2),它的粉末倍频效应为KDP(KH2PO4)的1.5倍并能够实现相位匹配,粉末透光范围宽为0.3~14μm,热分解温度超过650℃,展示了较好的综合性能。
The synthesis and single crystal structure and properties of Pb_7F_ (12) Br_2, a Pb-containing mixed halide, were studied. The main properties of Pb_7F_ (12) Br_2, which are related to nonlinear optical materials, were investigated for the first time. It was found that the optical band gap of this compound was 4.32 eV and the laser damage threshold was 25 MW · cm-2, which was much higher than the laser damage threshold (<5.2 MW) of AgGaS 2, a commercially available infrared non-linear optical crystal material under the same test conditions · Cm-2). The powder has a frequency doubling effect of 1.5 times that of KDP (KH2PO4) and enables phase matching. The range of powder transmission is 0.3 ~ 14μm, and the thermal decomposition temperature is over 650 ℃, which shows a good overall performance .