@proceedings{181231,
  author = {Rafa{\l} Lewicki and Mark Witinski and Biao Li and Gerard Wysocki and SPIE Proceedings},
  title = {Spectroscopic benzene detection using a broadband monolithic DFB-QCL array},
  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. },
  year = {2016},
  journal = {Novel In-Plane Semiconductor Lasers XV},
  volume = {9767},
  pages = {97671T1-97671T7},
  publisher = {SPIE},
  url = {https://doi.org/10.1117/12.2213696},
  language = {eng},
}