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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Quantum Optics

    Background:

    • Dual-comb spectroscopy (DCS) is a powerful technique for high-resolution spectral measurements.
    • Achieving long-term coherence and stability in DCS systems remains a challenge.

    Purpose of the Study:

    • To demonstrate a simplified dual-comb spectroscopy system with inherent coherence.
    • To enable robust and long-time coherent averaging of interferograms.

    Main Methods:

    • Generation of two inherently coherent optical frequency combs via seeded parametric downconversion.
    • Establishing inbuilt coherence by sharing a common comb line between the two combs.
    • Utilizing numerical post-processing to compensate for interferogram arrival time and phase drifts.

    Main Results:

    • Successful demonstration of a simple and inherently coherent dual-comb spectroscopy system.
    • Effective compensation for small drifts in interferogram arrival time and phase.
    • Enabling of long-time coherent averaging for improved signal-to-noise ratio.

    Conclusions:

    • The proposed system offers a simplified approach to dual-comb spectroscopy.
    • Inbuilt coherence and numerical post-processing are key to achieving robust long-time averaging.
    • This technique has potential for various spectroscopic applications requiring high precision and stability.