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  • Title: Linear cavity optical-feedback cavity-enhanced absorption spectroscopy with a quantum cascade laser.
    Author: Bergin AG, Hancock G, Ritchie GA, Weidmann D.
    Journal: Opt Lett; 2013 Jul 15; 38(14):2475-7. PubMed ID: 23939085.
    Abstract:
    A cw distributed feedback quantum cascade laser (DFB-QCL) coupled to a two-mirror linear optical cavity has been used to successfully demonstrate optical-feedback cavity-enhanced absorption spectroscopy (OF-CEAS) at 5.5 μm. The noise-equivalent absorption coefficient, α(min), was 2.4×10(-8) cm(-1) for 1 s averaging, limited by etalon-fringing. The temporal stability of the instrument allows NO detection down to 5 ppb in 2 s.
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