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Fast, real-time spectrometer based on a pulsed quantum-cascade laser

Normand, E. and McCulloch, M. and Duxbury, G. and Langford, N. (2003) Fast, real-time spectrometer based on a pulsed quantum-cascade laser. Optics Letters, 28 (1). pp. 16-18. ISSN 0146-9592

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We describe a mid-infrared spectrometer that is based on the combination of a multiple-pass absorption cell and a submicrosecond pulsed quantum-cascade laser. The spectrometer is capable of both making sensitive measurements and providing a real-time display of the spectral fingerprint of molecular vapors. For a cell with a path length of 9.6 m, dilution measurements made of the v_9 band transitions of 1,1-difluoroethylene indicate a sensitivity of 500 parts in 10^9, corresponding to a fractional absorbance of 4 × 10^-4 .