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Related Experiment Video

Updated: Feb 1, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Free-running mode-locked laser based dual-comb spectroscopy.

M Imrul Kayes, Nurmemet Abdukerim, Alexandre Rekik

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    Summary

    We developed a real-time dual-comb spectrometer using a fiber laser. This advanced system offers mutual coherence and common mode noise rejection without complex electronics.

    Area of Science:

    • Spectroscopy
    • Laser Physics
    • Optical Engineering

    Background:

    • Dual-comb spectroscopy (DCS) is a powerful technique for high-resolution molecular spectroscopy.
    • Traditional DCS systems often require complex electronic feedback for stabilization.
    • Operation in the mid-infrared (MIR) range presents unique challenges for laser sources.

    Purpose of the Study:

    • To demonstrate a novel real-time dual-comb spectrometer.
    • To achieve mutual coherence and common mode noise rejection between the two comb sources.
    • To develop a spectrometer that operates without complex electronic feedback systems.

    Main Methods:

    • Utilizing a bidirectional mode-locked fiber laser emitting two pulsed signals from a common cavity.
    • Operating the spectrometer in the 1.9 μm wavelength range.

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  • Leveraging the common cavity emission for intrinsic stabilization and noise suppression.

    • Main Results:

    • Successful implementation of a real-time dual-comb spectrometer.
    • Demonstrated mutual coherence between the two generated optical frequency combs.
    • Achieved common mode noise rejection, simplifying the system architecture.
    • The spectrometer operated effectively without requiring complex electronic feedback loops.

    Conclusions:

    • The presented dual-comb spectrometer offers a simplified and robust approach to high-resolution spectroscopy.
    • The use of a common cavity bidirectional fiber laser is a viable strategy for achieving stable and coherent dual-comb operation.
    • This technology has potential applications in various fields requiring real-time spectral analysis.