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Optical feedback frequency stabilized cavity ring-down spectroscopy.

Johannes Burkart, Daniele Romanini, Samir Kassi

    Optics Letters
    |August 15, 2014
    PubMed
    Summary

    We developed optical feedback frequency stabilized cavity ring-down spectroscopy (OFFS-CRDS), a highly sensitive technique for absorption detection. This method achieves kilohertz resolution and enables precision measurements of weak molecular transitions.

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    Area of Science:

    • Spectroscopy
    • Laser Physics
    • Molecular Physics

    Background:

    • Cavity ring-down spectroscopy (CRDS) is a powerful technique for sensitive absorption measurements.
    • Achieving high resolution and sensitivity simultaneously in CRDS has been a persistent challenge.

    Purpose of the Study:

    • To introduce a novel CRDS technique, optical feedback frequency stabilized cavity ring-down spectroscopy (OFFS-CRDS).
    • To achieve near-shot-noise-limited performance with kilohertz resolution and high absorption sensitivity.

    Main Methods:

    • Stabilizing a distributed feedback laser to a reference cavity using optical feedback and single-sideband modulation.
    • Employing a novel fibered Pound-Drever-Hall (PDH) locking scheme to transfer laser stability to the ring-down cavity.
    • Achieving several hundred ring-down events per second.

    Main Results:

    • Demonstrated absorption detection sensitivity of 5×10(-13) cm(-1) Hz(-1/2).
    • Achieved continuous spectral coverage of over 7 nm with a baseline noise of 5×10(-12) cm(-1).
    • Observed a Lamb dip in a weak CO2 overtone transition, demonstrating the technique's capability for high-precision measurements.

    Conclusions:

    • OFFS-CRDS offers a significant advancement in spectroscopic sensitivity and resolution.
    • The technique enables Doppler-free molecular overtone spectroscopy for precision measurements.
    • This method opens new avenues for studying hyperfine structures and pressure shifts in molecules.