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    Area of Science:

    • Optical Physics
    • Metrology
    • Spectroscopy

    Background:

    • Accurate laser frequency measurement is crucial for metrology and spectroscopy.
    • Traditional methods often require high-precision wavelength meters and stringent fluctuation control.

    Purpose of the Study:

    • To develop a simplified method for laser frequency measurement using a single optical frequency comb (OFC).
    • To reduce the reliance on high-precision wavelength meters and relax fluctuation requirements.

    Main Methods:

    • Utilizing the Vernier effect within an OFC to geometrically increase the comb-mode-number difference.
    • Sequentially stabilizing the OFC for accurate comb-mode number determination.

    Main Results:

    • Demonstrated a method for measuring laser frequency with a single OFC.
    • Achieved robust performance against relative fluctuations in mode spacing (up to 3.6 × 10-10).
    • Enabled accurate and reliable determination of the comb-mode number.

    Conclusions:

    • The proposed method offers a simpler and more robust approach to laser frequency measurement.
    • Significantly relaxes fluctuation requirements, broadening applications in metrology and precision spectroscopy.