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Absolute testing method for three optical flats using symmetric algorithms.

Keita Tomita, Kenichi Hibino, Toshiki Kumagai

    Optics Express
    |March 18, 2026
    PubMed
    Summary
    This summary is machine-generated.

    A new symmetric algorithm provides full-field absolute surface flatness testing for optical flats. This method enhances accuracy by analyzing multiple rotation measurements, improving upon traditional line-profile techniques in optical and semiconductor manufacturing.

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    Area of Science:

    • Optics and optical engineering
    • Metrology and measurement science

    Background:

    • Accurate surface flatness measurement is crucial for semiconductor and optical industries.
    • Classical three-flat tests provide line profiles, requiring multiple rotations for full-aperture evaluation.

    Purpose of the Study:

    • To introduce a novel full-field absolute testing method for optical flats.
    • To enhance the accuracy and efficiency of surface flatness measurements.

    Main Methods:

    • A symmetric algorithm utilizing three classical measurements and one rotation measurement at various angles.
    • Linear combination of symmetrically transformed phase map datasets.
    • Analysis of Zernike modes and cross-talk noise by altering rotation angles.

    Main Results:

    • The proposed method achieves full-field absolute testing, overcoming limitations of line-profile methods.
    • Numerical simulations and experimental results show improved accuracy compared to conventional techniques.
    • The algorithm effectively increases the cut-off frequency of cross-talk noise in Zernike modes.

    Conclusions:

    • The developed symmetric algorithm offers a more accurate and comprehensive approach to surface flatness testing.
    • This method is highly beneficial for quality control in high-precision industries like semiconductor manufacturing and optics.