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Highly coherent free-running dual-comb chip platform.

Nicolas Bourbeau Hébert, David G Lancaster, Vincent Michaud-Belleau

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    |April 14, 2018
    PubMed
    Summary

    This study presents a compact dual-comb laser source with exceptional frequency noise performance. It achieves 1-second mutual coherence, simplifying dual-comb interferometry without phase locking.

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Spectroscopy

    Background:

    • Dual-comb spectroscopy (DCS) offers high resolution but typically requires complex phase-locking mechanisms.
    • Environmental noise and intrinsic laser noise degrade the performance of free-running dual-comb sources.
    • Compact and robust laser platforms are needed to make DCS more accessible.

    Purpose of the Study:

    • To characterize the frequency noise performance of a novel, compact, free-running dual-comb source.
    • To demonstrate the potential for long mutual coherence times in such a system.
    • To enable mode-resolved dual-comb measurements without active phase stabilization.

    Main Methods:

    • Utilizing an erbium-doped glass chip with two adjacent, mode-locked waveguide lasers in a 1.2 L volume.

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  • Leveraging the common-cavity proximity to reject environmental noise by 20 dB.
  • Employing large-mode-area waveguides and low Kerr nonlinearity to minimize intrinsic noise.

    • Main Results:

    • Achieved a remarkably low mutual frequency noise floor of approximately 10 Hz²/Hz.
    • Demonstrated a free-running mutual coherence time of 1 second.
    • Successfully generated mode-resolved dual-comb spectra over the 1-second coherence time.

    Conclusions:

    • The developed compact dual-comb source exhibits excellent frequency stability and coherence.
    • This platform significantly simplifies dual-comb interferometry by eliminating the need for phase locking.
    • The results pave the way for more accessible and robust spectroscopic measurements.