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.


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    Titel :

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


    Beteiligte:
    Hagelschuer, Till (Autor:in) / Rothbart, Nick (Autor:in) / Richter, Heiko (Autor:in) / Wienold, Martin (Autor:in) / Schrottke, Lutz (Autor:in) / Grahn, H.T. (Autor:in) / Hübers, Heinz-Wilhelm (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    27.06.2016


    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Deutsch




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