Abstract

We demonstrate the application of a commercially available widely tunable continuous-wave external cavity quantum cascade laser as a spectroscopic source for the simultaneous detection of multiple gases. We measured broad absorption features of benzene and toluene between 1012 and 1063cm1 (9.88 and 9.41μm) at atmospheric pressure using an astigmatic Herriott multipass cell. Our results show experimental detection limits of 0.26 and 0.41ppm for benzene and toluene, respectively, with a 100m path length for these two gases.

© 2010 Optical Society of America

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