Beryllium-free Li4Sr(BO3)(2) for deep-ultraviolet nonlinear optical applications
Beryllium-free Li4Sr(BO3)(2) for deep-ultraviolet nonlinear optical applications
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适用于深紫外非线性光学应用的无铍 Li4Sr(BO3)(2)
DOI：
10.1038/ncomms5019
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发表时间：
2014
影响因子：
16.6
通讯作者：
Junhua Luo
中科院分区：
文献类型：
--
作者：
Sangen Zhao;Pifu Gong;Lei Bai;Xiang Xu;Shuquan Zhang;Zhihua Sun;Zheshuai Lin;Maochun Hong;Chuangtian Chen;Junhua Luo
非线性光学(NLO)材料在激光科学和技术中具有重要意义，因为它们可以扩展普通激光光源提供的波长范围。除了KBe2BO3F2(KBBF)以外，受结构导向光学性质的基本要求的限制，很少有NLO材料能够通过直接二次谐波过程产生实际的深紫外相干光。然而，KBBF的层化倾向强，含铍毒性大，阻碍了KBBF的商业化应用。本文报道了一种新的无铍硼酸盐Li4Sr(BO_3)_2，它保留了KBBF的结构优点，具有理想的光学性质。此外，Li_4Sr(BO_3)_2极大地缓解了晶体的层化倾向，使倍频效率比KBBF提高了一半以上。这些结果表明，Li_4Sr(BO_3)_2是下一代深紫外非线性光学材料的候选材料。这种无铍的硼酸盐代表了深紫外非线性光学材料发展的一个新的研究方向。
Nonlinear optical (NLO) materials are of great importance in laser science and technology, as they can expand the wavelength range provided by common laser sources. Few NLO materials, except KBe2BO3F2(KBBF), can practically generate deep-ultraviolet coherent light by direct second-harmonic generation process, limited by the fundamental requirements on the structure-directing optical properties. However, KBBF suffers a strong layering tendency and high toxicity of the containing beryllium, which hinder the commercial availability of KBBF. Here we report a new beryllium-free borate, Li4Sr(BO3)2, which preserves the structural merits of KBBF, resulting in the desirable optical properties. Furthermore, Li4Sr(BO3)2mitigates the layering tendency greatly and enhances the efficiency of second-harmonic generation by more than half that of KBBF. These results suggest that Li4Sr(BO3)2is an attractive candidate for the next generation of deep-ultraviolet NLO materials. This beryllium-free borate represents a new research direction in the development of deep-ultraviolet NLO materials.