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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Materials Science

    Background:

    • Frequency combs are crucial for precise measurements.
    • Microresonator-based frequency combs offer miniaturization and integration potential.
    • Tuning and stability have been key challenges for microresonator combs.

    Purpose of the Study:

    • To demonstrate a novel microresonator-based tunable mode-locked frequency comb source.
    • To achieve a wide mode-hop-free tuning range for enhanced spectroscopic capabilities.
    • To showcase the system's utility in high-resolution absorption spectroscopy.

    Main Methods:

    • Utilized a silicon microresonator pumped at 2.850 μm.
    • Implemented simultaneous tuning of the pump laser and cavity resonance.
    • Maintained a multi-soliton mode-locked state for stable comb generation.
    • Achieved a comb line spacing of 127 GHz over a spectrum spanning 2.425–3.970 μm.

    Main Results:

    • Demonstrated a mode-hop-free tuning range of 16 GHz.
    • Recorded the absorption spectrum of acetylene (C2H2) rovibrational transitions.
    • Achieved a spectral resolution of 0.21 cm⁻¹ (6.4 GHz) FWHM.
    • Showcased a frequency sampling step of 80 MHz.

    Conclusions:

    • The developed microresonator-based tunable frequency comb is a significant advancement.
    • The technique enhances the effective resolution of microresonator comb spectroscopy.
    • This work paves the way for compact, high-performance spectroscopic instruments.