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Deep ultraviolet lasers have important applications in semiconductor lithography, laser photoelectron spectroscopy and laser cutting due to their advantages of shorter wavelengths and higher precision processing. At present, KBe2BO3F2 (KBBF) is the only nonlinear optical (NLO) crystal that can actually output deep ultraviolet lasers. However, KBBF contains highly toxic elements and its crystal growth habit is severe. Therefore, it is urgent to explore new deep ultraviolet NLO crystal materials. .
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Key Laboratory of Optoelectronic Materials, Chinese Academy of Sciences, Institute of Material Structures, Chinese Academy of Sciences Luo Junhua, Research Group, funded by Zhao Xigen, National Natural Science Outstanding Youth Fund, and funded by Haixi Research Institute, “Spring Miao†Talent Special Project, based on elements The diagonal rule of the periodic table uses Al3+ to replace the toxic Be2+, ​​and a new type of deep blue NLO material Rb3Al3B3O10F (RABF) is designed and synthesized.
RABF inherits the structural advantages of KBBF crystals. In its structure, the [Al3(BO3)OF]∞ plane inherits the highly-aligned and consistent arrangement of [BO3]3- nonlinear primitives in KBBF crystals, thereby basically retaining a good KBBF. Optical properties. The experimental results show that the RABF transmission range reaches the deep ultraviolet region; under the laser irradiation of 1064 nm wavelength, the powder frequency doubled effect (1.2 × KDP) is comparable to KBBF, and phase matching can be achieved.
At the same time, the [Al3(BO3)OF]∞ plane layer in RABF is tightly connected by Al-F and Al-O bonds with strong bonding force. Calculations show that the interlaminar interaction force is higher than that of KBBF (KF ion bond). An order of magnitude (≥ 9.5 × KBBF), making the RABF crystals greatly overcome the stratified growth behavior of KBBF.
The research group collaborated with Lin Zheshu, a researcher of the Institute of Physics and Chemistry, Chinese Academy of Sciences, and made a first-principle theoretical calculation of its optical properties. The results are in agreement with experimental data. Relevant research results were published in "J. Am. Chem. Soc., 2015, 137, 2207-2210" and applied for Chinese invention patents. The results of this study will promote the development of non-deuterium deep UV nonlinear optical crystal materials.
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