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Interferometric stitching method for testing cylindrical surfaces with large apertures.

Shuai Xue, Yifan Dai, Shengyue Zeng

    Optics Express
    |July 16, 2021
    PubMed
    Summary
    This summary is machine-generated.

    A new interferometric stitching method enables testing of large cylindrical surfaces up to 700 mm, crucial for high-energy laser systems. This advancement overcomes previous limitations in aperture size for precise optical component metrology.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Laser Technology

    Background:

    • Cylindrical surfaces in high-energy laser systems require large apertures (up to semi-meter scale) and steep aperture angles (exceeding R/3).
    • Current interferometric stitching methods are limited to small dimensions (approx. 50 x 50 mm²) and stitch only along the arc direction, insufficient for these demanding applications.

    Purpose of the Study:

    • To propose and validate an advanced interferometric stitching method for testing large-aperture cylindrical surfaces.
    • To develop a subaperture stitching algorithm capable of stitching along both linear and arc directions.

    Main Methods:

    • Development of a novel interferometric stitching technique for large cylindrical optics.
    • Implementation of a subaperture stitching algorithm for dual-direction stitching (linear and arc).
    • Establishment of an interferometric stitching workstation with a six-axis motion stage and computer-generated holograms.

    Main Results:

    • The proposed method and workstation can test cylindrical surfaces with R/# values as low as R/0.5 and apertures up to 700 mm.
    • A convex cylindrical surface with a 350 x 380 mm² aperture was successfully tested, demonstrating feasibility.
    • The testable aperture was significantly enlarged from 50 mm to 700 mm.

    Conclusions:

    • The developed interferometric stitching method effectively addresses the limitations of current techniques for large cylindrical surfaces.
    • This advancement significantly expands the capability for testing large cylindrical optics, promoting their use in high-energy laser systems.