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2025 OIC Manufacturing "Road Runner" Challenge [Invited].

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    Optical Interference Coatings were fabricated for a manufacturing challenge, with performance evaluated by comparing measured spectra to target values. Results highlight design, fabrication, and measurement insights for advanced optical filters.

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    Area of Science:

    • Optical Engineering
    • Materials Science
    • Thin Film Optics

    Background:

    • The Optica Topical Meeting on Optical Interference Coatings hosts a Manufacturing Challenge (MC) to advance filter fabrication.
    • This year's challenge focused on designing and depositing filters with specific transmittance and reflectance spectra.

    Purpose of the Study:

    • To present measurements of optical filters fabricated for the ninth MC.
    • To evaluate filter performance based on spectral matching to target values.
    • To analyze observations on coating design, fabrication, and measurement.

    Main Methods:

    • Participants designed and deposited filters on provided substrates.
    • Filter performance was assessed by measuring transmittance and reflectance spectra (400-1100 nm).
    • Measurements were conducted at four independent laboratories; merit function values ranked the filters.

    Main Results:

    • Ten samples from six international teams were submitted, with layer counts from 31 to 135 and thicknesses from 3589 to 8088 nm.
    • The challenge required designs incorporating at least one absorbing layer for optimal performance.
    • Merit function values determined filter rankings and identified a winner.

    Conclusions:

    • The study provides a comparative analysis of optical filter fabrication capabilities.
    • Insights into the relationship between design, deposition, and spectral performance were gained.
    • The results contribute to understanding best practices in optical coating manufacturing.