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Welcome

Welcome to the infrared laser spectroscopy group! Our laboratory is part of the Institute for Laser Medicine (ILM) at the University of Düsseldorf.

Infrared laser spectroscopy is an excellent method for rapid and ultra-sensitve analysis of gas samples. Our research is focused on the investigation of novel laser-based spectroscopic technique and the application of infrared spectroscopy for real-time analysis of trace gases, e. g., in atmospheric air or in human breath. A recent review article can be found here: Mürtz, M.: Breath Diagnostics Using Laser Spectroscopy, Optics & Photonics News, 16, 30-35 (2005).

Most volatile compounds being relevant for atmospheric or medical research show a characteristic spectral fingerprint in the mid-infrared wavelength region (3-10 microns). Sensitive detection of this fingerprint through infrared laser spectroscopy provides unique possibilities for the analysis of extremely low trace gas fractions, like 1 volume part per billion (ppb) or below. In order to obtain absorption spectra of diluted gas samples, we develop and apply ultra-sensitive detection techniques, like cavity ring-down spectroscopy (CRDS) and Faraday rotation spectroscopy (FRS). These methods and our achievements are described in the research section.

The infrared laser sources which are required for absorption spectroscopy are developed and investigated in our laboratory: CO laser with tunable microwave sidebands, difference frequency generation laser, and quantum cascade lasers. These laser provide outstanding high spectral purity and tunability. This is also described in more detail in the research section.