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    This study introduces a novel method to correct spectral baseline fluctuations in dual-comb interferometry. The technique enhances measurement accuracy by addressing statistical and systematic errors in spectral data.

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    Area of Science:

    • Spectroscopy
    • Optical Interferometry
    • Metrology

    Background:

    • Dual-comb interferometry is a powerful spectroscopic technique.
    • Spectral baseline fluctuations introduce errors in measurements.
    • Accurate spectral analysis requires baseline correction.

    Purpose of the Study:

    • To present a method for measuring and correcting spectral baseline fluctuations in dual-comb interferometry.
    • To improve the accuracy and reliability of dual-comb spectroscopic measurements.

    Main Methods:

    • Measuring fluctuations using beat notes from combs and a continuous wave laser or comb repetition rates.
    • Characterizing amplitude-dependent spectral variations using low-resolution Fourier transforms.
    • Applying a nonstationary filter to account for comb variations during measurement.

    Main Results:

    • Successfully measured and corrected spectral baseline fluctuations.
    • Reduced statistical and systematic errors in dual-comb interferometry.
    • Demonstrated the effectiveness of the nonstationary filtering approach.

    Conclusions:

    • The presented method effectively addresses spectral baseline fluctuations.
    • This technique enhances the precision of dual-comb interferometry.
    • The findings contribute to more accurate spectral measurements.