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    Surface Flatness
    Diameter (mm)
    Thickness (mm)

    Interferometry Windows

    Interferometry Windows are used to measure the flatness of optical surfaces or certain optical components to ensure accuracy for a wide range of quality assurance or inspection applications. Interferometry Windows are optical surfaces that have been polished to an extremely precise level of flatness which are used as reference plates. Interferometry Windows are laid atop inspected surfaces at a specific angle while a laser beam is directed between them so that interference bands may be measured to determine flatness levels. Dual or single surface Interferometry Windows are both available.

    Single Surface Optical Flats
    • Sizes Ranging from ½" Diameter to 12" Diameter
    • Each λ/20 Flat 75mm and Larger Includes a Certificate of Calibration
    • Available with Standard Metallic Mirror Coatings: λ/10 and λ/20 Mirrors

    Spherical Aberration Compensation Plates
    • Precision N-BK7 Substrate
    • Optimized for Use in Collimated Light with Small Fields of View
    • Transmitted Wave Front Accurate to λ/16

    Dual Surface Optical Flats
    • λ/10 and λ/20 Surface Flatness Options
    • Certified with a Zygo Interferometer
    • Each λ/20 Flat Includes a Certificate of Calibration
    • Single Surface Optical Flats Also Available

    λ/20 Surface Accuracy Transmission Flats
    • λ/20 Accuracy
    • Compatible With Many Bayonet Style Housings
    • Interferogram and Certificate of Compliance Included


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