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The nonlinear optical crystal is an important photoelectric information functional material and plays an increasingly important role in modern technologies such as frequency conversion, optical parametric oscillation, electro-optic modulation and communication. At present, non-linear optical crystals capable of producing visible and ultraviolet light, such as KTiOPO4 (KTP), LiB3O5 (LBO) and CsLiB6O10 (CLBO), have basically satisfied practical applications. In the infrared band, although there are mature commercial crystals such as AgGaS2 and ZnGeP2, it is difficult to grow a single crystal with high optical quality, and its low laser damage threshold and severe two-photon absorption all limit its wide application. Therefore, the exploration of infrared non-linear optical materials with excellent performance has become an important direction of photoelectric functional materials.
The Institute of Physical and Chemical Technology, Xinjiang Academy of Sciences, Specialized Functional Materials and Devices Key Laboratory of Laboratory Research, Pan Shilie's research team has been working on new types of infrared nonlinear optical crystals in recent years. After systematic research, researchers found that M2LiVO4 (M = Rb, Cs) is a mid-infrared nonlinear optical crystal material with excellent performance. Both compounds have a wide transmission range, a large non-linear coefficient (4×KDP for the powder doubler Rb2LiVO4 and 5×KDP for the Cs2LiVO4, and all can be phase-matched) and a strong laser damage threshold. It is worth mentioning that these two compounds are all compounds with the same composition and are relatively easy to grow large-size single crystals with high optical quality, which means that these two crystals have potential applications in the mid-infrared region. In addition, through first-principles calculations, researchers found that the VO4 group is the main source of the frequency-doubling effect of these two compounds in the structural motifs of these two compounds.
The research results were published in Scientific Reports. The related research work was supported by the National Natural Science Foundation of China and the Western Light Project of the Chinese Academy of Sciences.
January 13, 2024
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January 13, 2024
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