[Zurück]

S. Lindner, A. Schwaighofer, J. Hayden, B. Lendl et al.:
"A new approach to QCL-based Mid-Infrared Refractive Index Spectroscopy";
Poster: FLAIR 2018, Assisi; 10.09.2018 - 14.09.2018.

Acquisition of classical absorption spectra of liquids in the mid IR-range with quantum cascade lasers (QCLs) is often limited in sensitivity by noise from the laser source. One approach to increase the robustness of measurements against excess intensity noise from the laser is to measure molecular dispersion, i.e. changes in refractive index, rather than absorption. While a number of studies on dispersion spectroscopy in the gas phase exist [1], applications to liquid
phase spectroscopy are yet pending. We recently demonstrated the use of a Mach-Zehnder interferometer (MZI) for simultaneous recording of refractive index and absorption spectra [2], where the focus was on the investigation of absorption measurements. In this work, we focus on the refractive index spectra and discuss the principles and capabilities of a custom bulit setup for acquisition of dispersion spectra.

https://publik.tuwien.ac.at/files/publik_275399.pdf