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    This study introduces a new method for optical frequency comb (OFC) interferometry that uses chromatic dispersion to distinguish fringe orders. This technique enables high-speed, single-shot imaging with improved accuracy and stability.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Spectroscopy

    Background:

    • Low-coherence interferometry often faces challenges in fringe order determination.
    • Optical frequency combs (OFCs) offer precise spectral control but require robust discrimination methods for single-shot applications.

    Purpose of the Study:

    • To develop a novel fringe-order discrimination method for low-coherence single-shot OFC interferometry.
    • To leverage chromatic dispersion for accurate fringe order identification in broadband light sources.

    Main Methods:

    • Utilized the wavelength-dependent refractive index (chromatic dispersion) of resonator materials.
    • Employed two distinct wavelength bands from a broadband source via band-pass filters.
    • Observed a linear increase in fringe shift with fringe order.

    Main Results:

    • Successfully resolved approximately 19 fringe orders in the visible spectrum.
    • Measured a fringe shift of ±1.5µm/order, consistent with theoretical predictions.
    • Demonstrated reliable fringe-order shift detection in the near-infrared region.

    Conclusions:

    • The proposed method offers a simple and mechanically stable solution for fringe-order discrimination.
    • Enables high-speed, single-shot imaging systems with enhanced accuracy.
    • Applicable to both visible and near-infrared spectral ranges for OFC interferometry.