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High-spectral-resolution terahertz imaging with a quantum-cascade laser.

Till Hagelschuer, Nick Rothbart, Heiko Richter

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    |July 14, 2016
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    We developed a high-resolution terahertz imaging system using a quantum-cascade laser to analyze methanol gas absorption and pressure. This system enables dynamic gas leak detection and mapping with high spectral detail.

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    Area of Science:

    • Spectroscopy
    • Quantum Optics
    • Gas Phase Chemistry

    Background:

    • Terahertz (THz) imaging offers unique capabilities for non-invasive analysis of various materials.
    • High-spectral-resolution measurements are crucial for detailed molecular identification and quantification.
    • Quantum-cascade lasers (QCLs) provide tunable THz radiation, enabling spectroscopic applications.

    Purpose of the Study:

    • To demonstrate a high-spectral-resolution terahertz imaging system for gas analysis.
    • To investigate the absorption spectra and linewidth of methanol (CH3OH) gas.
    • To dynamically observe and map gas leakage and pressure using THz imaging.

    Main Methods:

    • Utilized a multi-mode quantum-cascade laser (QCL) for tunable THz source.
    • Employed a fast scanning mirror for rapid data acquisition.
    • Used a sensitive Germanium:Gallium (Ge:Ga) detector for signal detection.
    • Recorded multiple spectra within 1.5 seconds for methanol gas analysis.
    • Achieved a frame rate of up to 3 Hz for dynamic gas leak observation.

    Main Results:

    • Successfully obtained spectral information, including local absorption and linewidth of methanol.
    • Observed dynamic gas leakage of methanol from a transparent tube into an evacuated cell.
    • Mapped local gas pressure by analyzing pressure broadening effects on spectral lines.
    • Demonstrated the system's capability for real-time gas analysis and pressure mapping.

    Conclusions:

    • The developed THz imaging system provides high spectral resolution for detailed gas analysis.
    • The system enables dynamic monitoring of gas dynamics and pressure changes.
    • This technology has potential applications in gas leak detection, environmental monitoring, and industrial process control.