Abstract

We demonstrate a mid-infrared spectrometer based on a quantum cascade laser operated in the intrapulse mode coupled with a custom dense pattern multipass cell. Detection in the range of hundreds of ppm to a few percent has been achieved due to a spectral sweep over seven ${{\rm CO}_2}$ absorption lines corresponding to a ${2}\;{{\rm cm}^{- 1}}$ spectral range. A detection limit of 2.22 ppm (corresponding to an absorption of ${1.77} \cdot {{10}^{- 7}}\;{{\rm cm}^{- 1}}$) for an averaging time of 4 s has been achieved during an in-laboratory characterization. The instrument was used for outdoor measurements of ${{\rm CO}_2}$ in the framework of a massive gas release trial in a military training center. A comparison of measurements with other devices is presented.

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