The wavelength expansion of the laser source is largely dependent on the frequency conversion capability of the material of the frequency conversion device, the nonlinear optical crystal. With the increasing importance of lasers in the ultraviolet and deep ultraviolet bands, how to design nonlinear optical materials with better synthesis performance is the focus and hotspot of current research.
The Key Laboratory of Optoelectronic Materials Chemistry and Physics of Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Ye Ning, the special research fund of the National Outstanding Youth Fund, the Chinese Academy of Sciences, B-class strategic pilot science and technology assistant and assistant researcher Luo Min Based on the nonlinear optical crystal Sr2Be2B2O7 (SBBO) structure model, the first lead/tin fluoroborate compound MB2O3F2 (M=Pb,Sn) was successfully designed by molecular engineering. Compared with the rigid [Be6B6O15] ∞ double layer existing in SBBO, MB2O3F2 has a flexible two-dimensional [B6O12F6] ∞ single layer, which overcomes the instability problem of SBBO structure (Fig. 1). In addition, although MB2O3F2 (M=Pb, Sn) is isomorphic and both contain stereochemically active lone pair cations, they exhibit diametrically opposite macroscopic frequency doubling effects. Through the cooperation with the Lin Zheshuai research group of the Institute of Physics and Chemistry of the Chinese Academy of Sciences, the first-principles calculation method is used to reveal that the difference in the frequency doubling of the two compounds is mainly due to the difference in the frequency-doubling active orbital anisotropy of Pb and Sn. The multiplication effect of PbB2O3F2 and SnB2O3F2 has a constructive and destructive effect (Fig. 2). Related research results are published in the Journal of the American Chemical Society, 2018, 140 (22), 6814-6817.
In addition, the research team has also made a series of research progress in the design, synthesis, crystal growth and nonlinear performance of UV and deep UV NLO materials. The results are published in J. Am. Chem. Soc., 2018, 140, 3884 Chem. Commun., 2018, 54, 1445; Chem. Commun., 2017, 53, 9398; J. Mater. Chem. C, 2017, 5, 8758; Chem. Mater 2017, 2, 896; Chem. Mater. 2016, 28, 9122; Chem. Mater. 2016, 28, 2301; Chem. Mater. 2015, 27, 7520.
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