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B. Lendl, A. Schwaighofer, J.P. Waclawek:
"New QCL Based Sensing Strategies for Liquids and Gase";
Vortrag: scix2018, Atlanta, GA (eingeladen); 21.10.2018 - 26.10.2018.

We report on the use of a new experimental set-up comprising an optimized Mach-Zehnder interferometer
and a broadly tunable external-cavity quantum cascade lasers for liquid sensing. Based on the proposed
sensing architecture the real as well as the imaginary part of the complex refractive index can be measured
yielding dispersion and absorbance spectra of the sample under investigation. Results will be presented for
detecting ethanol as well as sugars in aqueous solution. Calculation of dispersion spectra from the recorded
absorbance spectra via the Kramers Kronig transformation is in excellent agreement with recorded
dispersion spectra, thus confirming proper functioning of the proposed set-up. Concerning gas sensing we
report on recent advances made in cavity assisted photothermal interferometric spectroscopy for trace gas
sensing on the example of sulfur dioxide.