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Experimental power spectral density analysis for mid- to high-spatial frequency surface error control.

Javier Del Hoyo, Heejoo Choi, James H Burge

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    |October 20, 2017
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    Summary
    This summary is machine-generated.

    Controlling mid- to high-spatial frequency surface errors is crucial for advanced optics. This study links surface power spectral density (PSD) to fabrication parameters, presenting optimal polishing conditions for improved optical surface quality.

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    Area of Science:

    • Optical Engineering
    • Materials Science
    • Surface Metrology

    Background:

    • Surface errors in optical systems impact performance, causing scattered light and reduced contrast.
    • Current microsurface roughness specifications (RMS) are insufficient for advanced optical systems.
    • Mid- to high-spatial frequency errors (periods up to 2-3 mm) significantly affect optical performance.

    Purpose of the Study:

    • Investigate methods to control and minimize mid- to high-spatial frequency surface errors.
    • Relate surface power spectral density (PSD) to optical fabrication process parameters.
    • Identify optimal polishing conditions for achieving desired surface PSD.

    Main Methods:

    • Utilized measured surface power spectral density (PSD) from a finished Zerodur optical surface.
    • Systematically analyzed the relationship between PSD and various fabrication parameters (grinding, polishing materials, compounds).
    • Developed retraceable experimental polishing conditions.

    Main Results:

    • Established a correlation between fabrication parameters and surface PSD.
    • Identified key process parameters influencing mid- to high-spatial frequency errors.
    • Presented experimental conditions for optimizing optical surface PSD.

    Conclusions:

    • Fabrication process parameters critically influence mid- to high-spatial frequency surface errors.
    • Surface PSD is a key metric for characterizing and controlling optical surface quality.
    • The study provides a framework for producing optimal optical surface PSD through controlled fabrication.