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Mid-infrared dual-comb spectroscopy with absolute frequency calibration using a passive optical reference.

M A Abbas, A Khodabakhsh, Q Pan

    Optics Express
    |September 11, 2019
    PubMed
    Summary

    We developed an absolute-frequency-calibrated mid-infrared dual-comb spectrometer. A reference cell corrects frequency fluctuations, enabling high-quality spectra without complex processing.

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    Area of Science:

    • Spectroscopy
    • Quantum Optics
    • Laser Physics

    Background:

    • Dual-comb spectroscopy (DCS) offers broad spectral coverage and high resolution.
    • Absolute frequency calibration is crucial for accurate molecular spectroscopy.
    • Mid-infrared (mid-IR) spectroscopy probes fundamental molecular vibrations.

    Purpose of the Study:

    • To demonstrate an absolute-frequency-calibrated mid-infrared dual-comb spectrometer.
    • To achieve high-quality spectral data without active control of pump offset frequencies or OPO cavity length.
    • To enable precise spectroscopic measurements in the mid-IR region.

    Main Methods:

    • Utilized a singly-resonant optical parametric oscillator (OPO) with two MgO:PPLN crystals.
    • Employed two synchronously pumped mode-locked Yb-fiber lasers as dual frequency combs.
    • Integrated a reference absorption cell for real-time frequency fluctuation correction.

    Main Results:

    • Achieved a spectral resolution of 6 GHz.
    • Demonstrated a calibration precision of 120 MHz.
    • Obtained a high-quality averaged spectrum by correcting frequency drifts.

    Conclusions:

    • The developed mid-IR dual-comb spectrometer provides absolute frequency calibration.
    • The use of a reference cell simplifies the setup and processing while ensuring accuracy.
    • This technique is valuable for precise molecular spectroscopy applications.