Fast, real-time spectrometer based on a pulsed quantum-cascade laser.
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 nu9 band transitions of 1,1-difluoroethylene indicate a sensitivity of 500 parts in 10(9), corresponding to a fractional absorbance of 4 x 10(-4).
Normand
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E
Department of Physics and Applied Physics, John Anderson Building, University of Strathclyde, 107 Rottenrow East, Glasgow G4 0NG, Scotland, UK.
McCulloch
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M
Duxbury
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G
Langford
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N