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Balanced-detection interferometric cavity-assisted photothermal spectroscopy.

Johannes P Waclawek, Christian Kristament, Harald Moser

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    Summary
    This summary is machine-generated.

    This study introduces a novel balanced detection method for Fabry-Perot photothermal interferometry, significantly reducing noise for highly sensitive gas detection. The advanced sensor achieved a 5 ppbv minimum detection limit for sulfur dioxide (SO2).

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    Area of Science:

    • Optical Physics
    • Spectroscopy
    • Gas Sensing Technology

    Background:

    • Optical cavities offer sensitive gas detection via photothermal spectroscopy.
    • Previous cavity-based sensors were limited by excess noise, hindering sensitivity.
    • Fabry-Perot interferometry provides a robust platform for optical sensing.

    Purpose of the Study:

    • To implement balanced detection in Fabry-Perot photothermal interferometry for enhanced sensitivity.
    • To minimize noise close to the shot noise limit in cavity-based gas sensors.
    • To investigate the metrological performance of the novel sensor system.

    Main Methods:

    • Utilized two identical 1 mm-spaced Fabry-Perot cavities for balanced detection.
    • Employed a mid-infrared quantum cascade laser for photothermal excitation.
    • Used a near-infrared fiber laser as a probe to monitor refractive index changes.
    • Investigated sensor performance using sulfur dioxide (SO2) gas detection.

    Main Results:

    • Achieved a 5 ppbv minimum detection limit for SO2 at 1380.93 cm-1.
    • Attained a normalized noise equivalent absorption of 7.5 × 10-9 cm-1 W Hz-1/2.
    • Demonstrated excellent long-term sensor stability, allowing integration times of thousands of seconds.

    Conclusions:

    • Balanced detection effectively rejects excess noise in cavity-based photothermal sensors.
    • The developed sensor offers ultra-high sensitivity and stability for gas analysis.
    • This approach advances the capabilities of optical cavity-based gas detection systems.