Pan shilie research team of Xinjiang Institute of physics and chemistry, Chinese Academy of Sciences and sun Junliang, researcher of Peking University, have made progress in the research of nonlinear optical crystals

Nonlinear optical crystal material is an important photoelectric information functional material, which has a wide and important application in many fields, such as laser frequency conversion, information communication, optical signal processing and so on With the development of science and technology, the innovation and development of technology put forward more, higher and more comprehensive requirements for nonlinear optical crystal materials Among them, as the key component of all solid-state laser to output ultraviolet and deep ultraviolet laser, the development and application of ultraviolet and deep ultraviolet nonlinear optical crystals need to be developed and breakthrough In recent years, pan shilie research team, Key Laboratory of special environmental functional materials and devices, Xinjiang Institute of physical and chemical technology, Chinese Academy of Sciences, has been committed to the design and synthesis of new UV and deep UV nonlinear optical crystals The team selected the classical nonlinear crystal sr2be2o7 as the template, through the chemical co substitution design strategy, using the same main group elements Ba and Mg atoms with similar electronic structure to replace the SR and be atoms in the sr2be2o7 structure, and successfully designed and synthesized two kinds of ba3mg3 (BO3) 3F3 homomorphic polycrystalline compounds with asymmetric structure The team worked with sun Junliang, a researcher at Peking University, to successfully obtain the single crystal structure of orthorhombic and hexagonal two-phase crystals The existence and reversible phase transformation behavior of ba3mg3 (BO3) 3F3 homomorphic polycrystals were verified by DTA, X-ray diffraction and thermal expansion test Through a large number of flux exploration experiments, large-scale single crystals of orthorhombic phase ba3mg3 (BO3) 3F3 were successfully grown, and their optical properties were characterized based on high-quality single crystals The results show that orthorhombic phase ba3mg3 (BO3) 3F3 has wide transmission band (184-3780 nm), high laser damage threshold (6.2 GW / cm 2), moderate birefringence (0.045 @ 532 nm ）, a large second-order octave coefficient (d 33 = 0.51 PM / V) and good thermal stability At the same time, the crystal can achieve phase matching and is easy to grow It is expected to be used as a UV nonlinear optical crystal material for UV laser output The research results of physical and chemical properties of Ba 3mg 3 (Bo 3) 3F 3 (source: nature Communications) were published on nature communications (DOI: 10.1038 / s41467-018-05575-w) Xinjiang Institute of physics and chemistry is the first completion unit, and miridin mutelipu, a doctoral student, is the first author The research was supported by NSFC, Ministry of science and technology, Chinese Academy of Sciences, etc Previously, the team successfully designed and synthesized a series of alkali metal and alkaline earth metal fluoroborate deep UV nonlinear optical crystals, such as NH 4B 4O 6F (j.am Chem SOC 2017, 139, 10645), CSB 4O 6F (angel Chem Int Ed 2017, 56, 14119), RBB 4 o 6 F (angel Chem Int ed 2018, 57, 2150), SRB 5 o 7 F 3 (angel Chem Int ed 2018, 57, 6095), nab 4 o 6 F (angel Chem Int ed 2018, 57, 6577) and Li 2 B 6 o 9 F 2 (angel Chem Int ed 2017, 56, 3916) The relevant research provides a feasible strategy for the design of excellent UV and deep UV nonlinear optical crystals.