ENGINEERING TECHNOLOGY

Research progress on novel ultraviolet nonlinear optical crystals

Xinjiang Institute of Physics and Chemistry has made progress in the research of novel ultraviolet nonlinear optical crystals

Solid-state UV lasers are widely used in business and science. Nonlinear optical materials can convert and expand the laser frequency of the laser output by the laser at a specific wavelength, which is of great application value. For example, the fourth harmonic generation of Nd:YAG laser radiation using nonlinear optical materials is an efficient way to output a 266 nm UV laser. Synthesizing UV nonlinear optical materials presents challenges in material design due to demanding performance requirements. Previous studies have proposed fluorine-guided material design strategies to explore birefringence and nonlinear optical materials with excellent performance in borate systems. The introduction of fluorine into borates can effectively enrich structural chemistry and regulate optical properties. LiB3O5 (LBO) crystals are important nonlinear optical materials and are widely used, but unfortunately their small birefringence prevents LBO crystals from achieving direct quadruple output of 1064 nm lasers. Is it possible to increase the birefringence of LBO by adjusting the crystal structure to achieve shorter phase-matched wavelengths?

Recently, the Crystal Materials Research Center of Xinjiang Institute of Physical and Chemical Technology, Chinese Academy of Sciences obtained fluoroborate crystal LiNaB6O9F2 by chemical synthesis. LiNaB6O9F2 has a function made of[B6O11F2]The basic building blocks are composed of two interpenetrations3[B6O9F2]∞ three-dimensional network, which was observed for the first time in a fluoroborate system. LiNaB6O9F2 achieves a better balance between deep UV cut-off edge, large frequency doubling response (1.1 × KDP), and suitable birefringence (0.067@1064 nm). With the introduction of fluorine, LiNaB6O9F2 exhibited fluorine-directed performance optimizations, including greater birefringence than LBO (0.067@1064 nm for LBO of 0.040@1064 nm) and shorter phase-matched wavelengths than LBO (210 nm versus 277 nm for LBO). This work enriches the structural chemistry of fluoroborates and proves that the fluorine-guided strategy is a feasible method for exploring nonlinear optical crystals with excellent optical properties.

The research results were published in Advanced Optical Materials in the form of a full-text research article. The research work has been supported by the National Natural Science Foundation of China and the Chinese Academy of Sciences. (Source: Xinjiang Institute of Physical and Chemical Technology, Chinese Academy of Sciences)

Related paper information:https://doi.org/10.1002/adom.202202195

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