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Screen test for large mirrors.

I Ghozeil, J E Simmons

    Applied Optics
    |February 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new shop method for testing large mirrors utilizes a square-array sampling screen. This technique offers reliable, repeatable results and detects surface deviations of +/-0.1lambda or greater, independent of air turbulence.

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    Area of Science:

    • Optical metrology
    • Surface testing
    • Large optic characterization

    Background:

    • Accurate testing of large optics is crucial for performance.
    • Existing methods can be susceptible to environmental factors like air turbulence.
    • A need exists for reliable, repeatable, and self-calibrating surface testing techniques.

    Purpose of the Study:

    • To introduce a novel shop method for testing large mirrors.
    • To address limitations of current optical testing procedures.
    • To develop a robust and efficient surface metrology technique.

    Main Methods:

    • Development of a shop method employing a square-array sampling screen.
    • Implementation of a simple test setup.
    • Utilizing self-calibration for enhanced accuracy.

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    Main Results:

    • Achieved high surface sampling rate.
    • Demonstrated reliability and repeatability of results.
    • Successfully detected surface departures of +/-0.1lambda (at 5000 A) or greater.
    • Method is independent of random air turbulence.
    • Accurate detection of large-area departures.

    Conclusions:

    • The developed shop method provides a reliable and repeatable approach for testing large mirrors.
    • The technique is robust against environmental disturbances like air turbulence.
    • It offers precise detection of significant surface departures, suitable for large optic characterization.