Title: A quantum cascade laser-based Mach–Zehnder interferometer for chemical sensing employing molecular absorption and dispersion
Language: English
Authors: Hayden, Jakob 
Hugger, Stefan 
Fuchs, Frank 
Lendl, Bernhard  
Category: Original Research Article
Issue Date: 27-Jan-2018
Journal: Applied Physics B: Lasers and Optics 
Abstract: 
We employ a novel spectroscopic setup based on an external cavity quantum cascade laser and a Mach–Zehnder interferometer to simultaneously record spectra of absorption and dispersion of liquid samples in the mid-infrared. We describe the theory underlying the interferometric measurement and discuss its implications for the experiment. The capability of simultaneously recording a refractive index and absorption spectrum is demonstrated for a sample of acetone in cyclohexane. The recording of absorption spectra is experimentally investigated in more detail to illustrate the method’s capabilities as compared to direct absorption spectroscopy. We find that absorption signals are recorded with strongly suppressed background, but with smaller absolute sensitivity. A possibility of optimizing the setup’s performance by unbalancing the interferometer is presented.
DOI: 10.1007/s00340-018-6899-8
Library ID: AC15321020
URN: urn:nbn:at:at-ubtuw:3-5042
ISSN: 0946-2171
Organisation: E164 - Institut für Chemische Technologien und Analytik 
Publication Type: Article
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