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Simple methods for estimating the performance and specification of optical components with anisotropic mid-spatial

Hamidreza Aryan, Glenn D Boreman, Thomas J Suleski

    Optics Express
    |November 6, 2019
    PubMed
    Summary

    New methods address challenges in specifying surfaces with mid-spatial frequency (MSF) errors. A novel approach uses polar plots of root mean square (RMS) error to capture anisotropy and guide acceptance criteria for optical surfaces.

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    Area of Science:

    • Optical engineering
    • Metrology
    • Surface characterization

    Background:

    • Specifying and tolerancing surfaces with mid-spatial frequency (MSF) errors presents significant challenges.
    • Traditional surface statistics are insufficient for capturing the structured nature of MSF errors.
    • Understanding MSF error impact on optical performance, like the modulation transfer function (MTF), is crucial.

    Purpose of the Study:

    • To develop a novel surface specification method for MSF errors.
    • To account for the structured and anisotropic characteristics of MSF errors.
    • To provide an intuitive criterion for surface acceptance based on error characteristics.

    Main Methods:

    • Development of a new surface specification approach.
    • Analysis of MSF errors considering their structured and anisotropic nature.

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  • Utilizing polar coordinate plots of bandlimited RMS error values.

    • Main Results:

    • An intuitive polar plot visualizes bandlimited RMS error values.
    • The method incorporates surface error anisotropy information.
    • An easily understandable acceptance criterion for surfaces with MSF errors is established.

    Conclusions:

    • The novel method effectively specifies surfaces with MSF errors.
    • The approach enhances the understanding of MSF error impact on MTF.
    • This specification method offers a practical tool for optical surface quality control.