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Interferometric testing of large optical components with circular computer holograms.

Y Ichioka, A W Lohmann

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    Summary
    This summary is machine-generated.

    Holograms with circular fringes offer a novel method for testing large aspheric mirrors, simplifying wavefront comparison and improving accuracy in optical metrology.

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    Area of Science:

    • Optical Metrology
    • Holography
    • Aspheric Optics Testing

    Background:

    • Traditional testing of large aspheric mirrors relies on spherical reference mirrors and test glasses.
    • Holograms have emerged as synthetic test glasses, but require fine fringe distances for diffraction order separation.

    Purpose of the Study:

    • To propose and investigate the use of holograms with circular fringes for testing aspheric mirrors.
    • To enhance the efficiency and accuracy of interferometric testing of large optical components.

    Main Methods:

    • Utilizing computer-generated holograms with circular fringes as synthetic test glasses.
    • Exploiting the focusing properties of different diffraction orders on the optical axis.
    • Leveraging the hollow cone wavefront from mirrors with central holes for order elimination.

    Main Results:

    • Circular fringe holograms allow diffraction orders to focus at distinct points on the optical axis.
    • This facilitates the elimination of unwanted diffraction orders, simplifying the interferometric comparison.
    • The method is particularly suitable for testing mirrors with central holes.

    Conclusions:

    • Holograms with circular fringes provide an effective and simplified approach for testing large aspheric mirrors.
    • This technique offers advantages in wavefront comparison and optical metrology applications.
    • The proposed method presents a viable alternative to traditional testing setups.