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High-precision tracking and dispersion compensation technology based on dual-liquid-crystal-polarization-grating.

Junyao Wang, Zhen Fan

    Optics Express
    |June 11, 2026
    PubMed
    Summary

    This study introduces a compact dual-liquid-crystal-polarizing-grating system for miniaturized tracking. A novel dispersion angle compensation method ensures precise, coaxial beam tracking across different wavelengths, achieving high accuracy.

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    Area of Science:

    • Optoelectronics
    • Optical Engineering
    • Servo Systems

    Background:

    • Traditional tracking systems are bulky and heavy.
    • Simultaneous transmit and receive systems use different wavelengths, causing beam deviation due to grating dispersion.
    • This non-coaxial issue hinders miniaturization efforts.

    Purpose of the Study:

    • To investigate high-precision beam tracking technology for miniaturized dual-liquid-crystal-polarizing-grating systems.
    • To address beam deviation caused by grating dispersion in dual-grating systems.
    • To enable coaxial beam transmission and reception for miniaturized tracking applications.

    Main Methods:

    • Analysis of the beam deflection control mechanism in dual-grating systems.
    • Development of a comprehensive dual-grating tracking control model.

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  • Implementation of a dispersion angle compensation method using a fast steering mirror.

    • Main Results:

    • Effective compensation for dispersion angles across different wavelengths.
    • Successful dynamic tracking and pointing with consistent beam deflection.
    • Achieved dynamic tracking accuracy of 14.33μrad, dynamic pointing accuracy of 16.27μrad, and static pointing accuracy of 4.12μrad.

    Conclusions:

    • The proposed method validates the feasibility of dynamic tracking and pointing for dual-grating systems.
    • The technology lays the foundation for miniaturizing optoelectronic servo systems.
    • High-precision beam tracking is achievable despite grating dispersion effects.