Important progress in the synthesis of new nonlinear optical crystals by Fujian Institute of physical structure, Chinese Academy of Sciences

Nonlinear optical materials play an irreplaceable role in the fields of all solid-state lasers, medical treatment, communication, precision manufacturing, nuclear fusion, national defense and military, etc., so how to design and synthesize new high-performance nonlinear optical materials through reasonable design has always been the research hotspot and difficulty in this field Through the introduction of structural elements that are easy to produce the second-order Jiang Taylor effect, compounds with asymmetric structure can be obtained effectively This strategy is widely used in the synthesis of new nonlinear optical materials These structural units include d 0 transition metal ions (Ti 4 +, V 5 +, Nb 5 +, etc.), cations containing lone pair electrons (Pb 2 +, sb 3 +, Bi 3 +, Se 4 +, I 5 +, etc.), and systems containing π conjugation (borates, etc.) However, different elements have different properties, and there are different problems and difficulties in the synthesis process For example, for metal iodates, they are usually prepared under mild acid conditions, while niobium is very stable under such conditions, and it is difficult to combine the two Therefore, the synthesis of niobium containing metal iodate has always been a difficulty in this field With the support of the strategic leading science and technology program of the Chinese Academy of Sciences and the National Natural Science Foundation of China, researcher Fu Ruibiao of the research group of Academician Wu Xintao of Fujian Institute of material structure and State Key Laboratory of structural chemistry of the Chinese Academy of Sciences cooperates with associate professor Ma Zuju of Anhui University of technology to systematically analyze the nature of niobium and make use of the classic The first nonlinear optical crystal of niobium oxysulfate Nb 2O 3 (IO 3) 2 (so 4) has been grown by the inorganic chemical reaction of niobium oxysulfate, which takes the sulfate group as a bridge and combines NB with iodate group The experimental results show that the crystal has good physical and chemical stability Its heat-resistant temperature in the air is as high as 580 ℃, laser damage threshold is as high as 20 * AgGaS 2, and it is resistant to concentrated sulfuric acid and water It has a strong phase matched second-order frequency doubling effect (6 * KDP) It has a high transmittance in the wavelength range of 0.38-8 μ m, and it is a potential material for visible infrared region Second order nonlinear optical crystal This research result not only synthesized the iodate containing Nb through reasonable design, but also solved the problem of sulfate crystal easily soluble in water and deliquescence It was published in the German Journal of Applied Chemistry (angew Chem Int ed 2019, 58, 3824-3828) by very important paper (VIP) The first author of this paper is Tang Hongxin, a postgraduate in joint training The other authors are Zhang Yuxiao, Zhuo Chao and Lin Hua, associate researchers.