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    Home > Chemicals Industry > Chemical Technology > Polycrystalline powder test method of crystal electro-optical coefficient proposed by Fujian Institute of Physics

    Polycrystalline powder test method of crystal electro-optical coefficient proposed by Fujian Institute of Physics

    • Last Update: 2022-06-13
    • Source: Internet
    • Author: User
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    Electro-optic crystal is an important functional crystal.
    The high-speed electro-optic switch, electro-optic modulator and electro-optic deflector made from it have important applications in laser technology, spectroscopy technology and other fields
    .
    Although some practical electro-optic crystals have been commercialized, more electro-optic crystals with excellent performance still need to be explored to meet the growing application demands of electro-optic crystals
    .
    At present, research on new electro-optic crystals is basically stagnant.
    One of the reasons is that there is no appropriate theoretical method to systematically guide the exploration of new electro-optic crystals.
    At the same time, the application of electro-optic crystals is restricted by crystal symmetry and other harsh conditions, such as There are certain difficulties in the growth of high optical quality, large-size single crystals and the design of electro-optical test devices
    .
    Therefore, for a long time, there have been few types of practical electro-optic crystals, relatively few researches on electro-optic crystals, and fewer new types of electro-optic crystals with excellent performance
    .

    Researcher Ye Ning's research team at the Key Laboratory of Optoelectronic Materials Chemistry and Physics, Chinese Academy of Sciences, Fujian Institute of Material Structure, Chinese Academy of Sciences, was inspired by the exploration of efficient powder frequency doubling test methods for nonlinear optical crystals, and proposed a powder test method for crystal electro-optic coefficients to realize crystals Preliminary characterization of electro-optical properties
    .
    Different from pure theoretical calculation or testing, this method predicts the electro-optical coefficient of the crystal through the powder frequency double test, the infrared reflectance spectrum and the Raman spectrum test and analysis of the crystal sample in the powder state
    .

    In order to verify the effectiveness of the powder test method, the researchers selected a series of practical electro-optic crystals and obtained their electro-optic coefficients through the powder test method.
    The results showed that the powder measured values ​​of the electro-optic coefficients of each material were consistent with the actual crystals
    .
    Under the guidance of this method, the researchers explored and screened the potential electro-optical crystal CsLiMoO 4 (CLM), and obtained high-quality large CLM crystals with the help of the Czochralski growth technology to further study the electro-optical properties of CLM crystals
    .
    The results of the traditional half-wave voltage method to test the electro-optic coefficients of CLM crystals are consistent with the calculated values ​​obtained by the powder method, which shows that the powder test method has a certain guiding and reference role in breaking the dilemma of electro-optic crystal exploration.
    CLM crystals have potential electro-optic application value
    .
    It is foreseeable that this powder test method can open up a new and efficient way to explore new types of electro-optic crystals, and promote the research and development of electro-optic crystals
    .

    4

    Related research results were recently published in National Science Review (2020, 10.
    1093/nsr/nwaa104).
    Ph.
    D.
    Xu Feng is the first author of the paper, and associate researchers Yan Tao and Ye Ning are the corresponding authors of the paper
    .
    The research work was funded by the Strategic Leading Science and Technology Project of the Chinese Academy of Sciences (Category B) and the National Natural Science Foundation of China
    .

    Figure 1.
    Flow chart of powder test method for calculating crystal electro-optic coefficient

    Figure 2.
    CsLiMoO4 crystal growth and its electro-optical performance characterization

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