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Annular subaperture interferometry for high-departure aspheres using paraboloidal parameterization.

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    A new low-cost Fizeau interferometry method measures complex aspheres without null optics. This technique stitches subaperture data to accurately reconstruct optics with high spherical departure.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Interferometry

    Background:

    • Measuring aspheric optics with high spherical departure presents significant metrology challenges.
    • Traditional methods often require expensive and complex null optics.
    • Accurate characterization of aspheres is crucial for advanced optical systems.

    Purpose of the Study:

    • To present a low-cost, effective technique for measuring high-spherical-departure concave aspheres.
    • To demonstrate the capability of stitched Fizeau interferometry without null optics.
    • To provide an accessible method for characterizing complex aspheric and freeform optics.

    Main Methods:

    • Utilizing stitched Fizeau interferometric measurements of aspheres.
    • Parameterizing surface figures using subapertures as variances from best-fit paraboloids.
    • Subtracting optical path differences to remove aberrations without Zernike polynomial fitting.

    Main Results:

    • Successful proof-of-concept measurement and reconstruction of a 250 mm ellipsoidal mirror.
    • Demonstrated capability to measure optics with over 3000 waves of spherical departure.
    • Validated a low-cost approach for asphere metrology.

    Conclusions:

    • The presented technique offers an inexpensive solution for measuring large-aperture aspheres and high-departure freeform optics.
    • This method simplifies the metrology process by eliminating the need for null optics.
    • The technique expands the available tools for advanced optical surface characterization.