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Updated: Jan 19, 2026

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Mid-infrared supercontinuum-based upconversion detection for trace gas sensing.

Khalil Eslami Jahromi, Qing Pan, Lasse Høgstedt

    Optics Express
    |September 13, 2019
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a novel method for trace gas sensing using mid-infrared supercontinuum lasers. By converting signals to near-infrared, it enables fast, cost-effective detection of gases like ethane with high sensitivity.

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    Area of Science:

    • Laser Spectroscopy
    • Trace Gas Sensing
    • Mid-Infrared (MIR) Technology

    Background:

    • Advancements in mid-infrared (MIR) supercontinuum light sources offer broad spectral coverage for laser-based trace gas sensing.
    • Traditional MIR detection is limited by slow, expensive detector arrays, hindering high-speed broadband absorption signal measurement.

    Purpose of the Study:

    • To circumvent limitations of MIR detector arrays in broadband absorption spectroscopy.
    • To enable fast and cost-effective trace gas detection using readily available near-infrared (NIR) detectors.

    Main Methods:

    • Demonstrated MIR-to-NIR signal upconversion to leverage silicon-based detector arrays.
    • Integrated a MIR supercontinuum source, MIR-to-NIR upconverter, and an astigmatic multipass cell for gas detection.
    • Employed a least-square global fitting method for multi-species detection analysis.

    Main Results:

    • Achieved fast detection (~20 ms) of ethane with sub-ppmv sensitivity at room temperature.
    • Successfully utilized cost-effective NIR detector arrays for broadband absorption measurements.
    • Demonstrated potential for multi-species gas detection.

    Conclusions:

    • The MIR-to-NIR upconversion technique overcomes detector limitations in MIR spectroscopy.
    • This approach enables rapid, sensitive, and potentially low-cost trace gas sensing.
    • The technology shows promise for environmental monitoring and biomedical research applications.