Design and synthesis of a nonlinear optical material BaAl4S7 with a wide band gap inspired from SrB4O7
Design and synthesis of a nonlinear optical material BaAl4S7 with a wide band gap inspired from SrB4O7
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DOI：
10.1039/c7tc05693a
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发表时间：
2018-03
影响因子：
6.4
通讯作者：
Dajiang Mei;Jianqiao Jiang;F. Liang;Shiyan Zhang;Yuandong Wu;Congting Sun;D. Xue;Zheshuai Lin
中科院分区：
文献类型：
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作者：
Dajiang Mei;Jianqiao Jiang;F. Liang;Shiyan Zhang;Yuandong Wu;Congting Sun;D. Xue;Zheshuai Lin
产生中红外高功率激光器最方便的方法是利用具有高激光损伤阈值(LDT)的非线性光学(NLO)材料。LDT本质上依赖于能带，但通常与NLO效应相反。因此，在良好的中红外非线性光学材料中实现带隙(例如3.0 eV)和非线性光学响应(DIJ>；10×KDP)之间的良好平衡是必要的。在这项研究中，受所有已知的硼酸盐晶体中LDT最高的氧化物SrB4O7的启发，我们认为具有相似晶体结构的硫系化合物BaAl4S7可能具有吸引人的非线性光学性质。实验表明，BaAl4S7在所有已知的中红外非线性硫系化合物中具有最宽的禁带宽度(>；3.95 eV)，其LDT是商业材料AgGaS2的10倍以上。其非线性光学系数大于10×KDP，是AgGaS_2的一半。所有这些特征表明，BaAl4S7是一种潜在的中红外非线性光学材料。
The most convenient method to generate mid-infrared (mid-IR) high-power lasers is through nonlinear optical (NLO) process using NLO materials with high laser damage threshold (LDT). The LDT is intrinsically dependent on the energy band gap, but often inverse of the NLO effect. Therefore, achieving a good balance between band gap (Eg > 3.0 eV) and NLO response (dij > 10 × KDP) in a good mid-IR NLO material is necessary. In this study, inspired by the oxide SrB4O7 with the highest LDT among all known borate crystals, we propose that the chalcogenide BaAl4S7 with similar crystal structure may have attractive NLO properties. The experiments revealed that BaAl4S7 possesses the broadest band gap (>3.95 eV) among all known mid-IR NLO chalcogenides, and its LDT is above 10 times that of the commercial material AgGaS2. Moreover, its NLO coefficient is above 10 × KDP (half of that of AgGaS2). All these features demonstrate that BaAl4S7 is a potential candidate as a good mid-IR NLO material.