We report on a high-spectral-resolution terahertz imaging system operating with a multi-mode quantum-cascade laser (QCL), a fast scanning mirror, and a sensitive Ge:Ga detector. By tuning the frequency of the QCL, several spectra can be recorded in 1.5 s during the scan through a gas cell filled with methanol (CH3OH). These experiments yield information about the local absorption and the linewidth. Measurements with a faster frame rate of up to 3 Hz allow for the dynamic observation of CH3OH gas leaking from a terahertz-transparent tube into the evacuated cell. In addition to the relative absorption, the local pressure is mapped by exploiting the effect of pressure broadening.


    Access

    Download


    Export, share and cite



    Title :

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


    Contributors:

    Published in:

    Publication date :

    2016-06-27


    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    German




    3D imaging with a terahertz quantum cascade laser

    Nguyen, K.L. / Johns, M.L. / Gladden, L.F. et al. | IEEE | 2005


    High-resolution terahertz spectroscopy with quantum-cascade lasers

    Hübers, Heinz-Wilhelm / Richter, Heiko / Wienold, Martin | German Aerospace Center (DLR) | 2019

    Free access

    MA1-4 3D Imaging with a Terahertz Quantum Cascade Laser (QCL)

    Nguyen, K. L. / Johns, M. L. / Gladden, L. F. et al. | British Library Conference Proceedings | 2005


    High-performance terahertz quantum cascade lasers

    Kohler, R. / Tredicucci, A. / Beltram, F. et al. | IEEE | 2003


    Real-time terahertz imaging through self-mixing in a quantum-cascade laser

    Wienold, M. / Hagelschuer, T. / Rothbart, N. et al. | German Aerospace Center (DLR) | 2016

    Free access