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Title
A quantum cascade laser-based MachZehnder interferometer for chemical sensing employing molecular absorption and dispersion
AuthorHayden, Jakob ; Hugger, Stafan ; Fuchs, Frank ; Lendl, Bernhard
Published in
Applied Physics B : Lasers and Optics, 2018,, page 1-9
PublishedSpringer Nature, 2018
LanguageEnglish
Document typeJournal Article
ISSN0946-2171
URNurn:nbn:at:at-ubtuw:3-5042 Persistent Identifier (URN)
DOI10.1007/s00340-018-6899-8 
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 The work is publicly available
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A quantum cascade laser-based MachZehnder interferometer for chemical sensing employing molecular absorption and dispersion [1.29 mb]
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Abstract (English)

We employ a novel spectroscopic setup based on an external cavity quantum cascade laser and a MachZehnder 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 methods 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 setups performance by unbalancing the interferometer is presented.

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CC-BY-License (4.0)Creative Commons Attribution 4.0 International License