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Non-null testing for aspheric surfaces using elliptical sub-aperture stitching technique.

Zixin Zhao, Hong Zhao, Feifei Gu

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    |March 26, 2014
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    Summary
    This summary is machine-generated.

    We introduce an elliptical sub-aperture stitching (ESAS) method for measuring aspheric surfaces. This technique uses a non-null configuration and dynamic tilt to accurately stitch phase data, overcoming traditional null testing limitations.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Surface Measurement

    Background:

    • Traditional null testing methods for aspheric surfaces have inherent disadvantages.
    • Accurate measurement of aspheric surfaces is crucial in advanced optics manufacturing.

    Purpose of the Study:

    • To propose and validate a novel elliptical sub-aperture stitching (ESAS) method for aspheric surface measurement.
    • To overcome the limitations of conventional null testing techniques.

    Main Methods:

    • Utilizing a non-null configuration with dynamic tilt to generate local nearly null fringe patterns.
    • Extracting phase data from elliptical masks with minimal retrace errors.
    • Developing a stitching algorithm to combine sub-aperture data for full-aperture reconstruction.

    Main Results:

    • Simulation experiments demonstrated the method's performance.
    • Practical examples confirmed the correctness of the ESAS method.
    • Stitching results showed excellent agreement with full-aperture null testing.

    Conclusions:

    • The ESAS method provides an effective approach for measuring aspheric surfaces.
    • The non-null configuration and stitching algorithm successfully address limitations of traditional methods.
    • The proposed technique is validated for accurate and reliable aspheric surface metrology.