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Grating mosaic error evaluation method based on dual-wavelength diffraction spot centroid analysis.

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    This study introduces a novel dual-wavelength diffraction method for precise measurement of five-dimensional grating mosaic errors. This technique enhances accuracy in large-aperture grating manufacturing and displacement sensing applications.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Materials Science

    Background:

    • Grating mosaic technology is crucial for large-aperture gratings used in high-precision sensing and laser systems.
    • Traditional methods face challenges in comprehensively detecting five-dimensional mosaic errors.

    Purpose of the Study:

    • To develop a method for evaluating five-dimensional grating mosaic errors.
    • To improve the accuracy and efficiency of large-scale mosaic grating fabrication.

    Main Methods:

    • Dual-wavelength diffraction spot centroid analysis.
    • Quantitative mapping model correlating mosaic errors with centroid displacement.
    • Improved centroid localization algorithm for spot coordinate extraction.
    • Utilizing dual-wavelength lasers to decouple mixed error signals.

    Main Results:

    • Established a linear relationship between grating alignment errors and diffraction spot centroid positions.
    • Achieved detection resolution of 0.09 µrad for angular errors and 0.02 µm for linear displacement errors (with 2.4 µm CCD pixel size).
    • Successfully distinguished and measured both angular and displacement errors during grating mosaic process.

    Conclusions:

    • The proposed method offers a non-contact solution for composite detection of multi-dimensional errors in mosaic grating fabrication.
    • Significant application value for large-aperture grating manufacturing and grating-based displacement sensing.
    • Advances the field of precision metrology for optical components.