Spectroscopic benzene detection using a broadband monolithic DFB-QCL array

Rafał Lewicki, Mark Witinski, Biao Li, Gerard Wysocki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Quantitative laser spectroscopic measurements of complex molecules that have a broad absorption spectra require broadly tunable laser sources operating preferably in the mid-infrared molecular fingerprint region. In this paper a novel broadband mid-infrared laser source comprising of an array of single-mode distributed feedback quantum cascade lasers was used to target a broadband absorption feature of benzene (C6H6), a toxic and carcinogenic atmospheric pollutant. The DFB-QCL array is a monolithic semiconductor device with no opto-mechanical components, which eliminates issues with mechanical vibrations. The DFB-QCLs array used in this work provides spectral coverage from 1022.5 cm-1 to 1053.3 cm-1, which is sufficient to access the absorption feature of benzene at 1038 cm-1 (9.64 μm). A sensor prototype based on a 76 m multipass cell (AMAC-76LW, Aerodyne Research) and a dispersive DFB-QCL array beam combiner was developed and tested. The Allan deviation analysis of the retrieved benzene concentration data yields a short-term precision of 100 ppbv/Hz1/2 and a minimum detectable concentration of 12 ppbv for 200 s averaging time. The system was also tested by sampling atmospheric air as well as vapors of different chemical products that contained traces of benzene.

Original languageEnglish (US)
Title of host publicationNovel In-Plane Semiconductor Lasers XV
EditorsAlexey A. Belyanin, Peter M. Smowton
PublisherSPIE
ISBN (Electronic)9781510600027
DOIs
StatePublished - Jan 1 2016
EventNovel In-Plane Semiconductor Lasers XV - San Francisco, United States
Duration: Feb 15 2016Feb 18 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9767
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherNovel In-Plane Semiconductor Lasers XV
CountryUnited States
CitySan Francisco
Period2/15/162/18/16

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Lewicki, R., Witinski, M., Li, B., & Wysocki, G. (2016). Spectroscopic benzene detection using a broadband monolithic DFB-QCL array. In A. A. Belyanin, & P. M. Smowton (Eds.), Novel In-Plane Semiconductor Lasers XV [97671T] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9767). SPIE. https://doi.org/10.1117/12.2213696