title: Fast, real-time spectrometer based on a pulsed quantum-cascade laser.
abstract: 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).
authors.affiliation: Department of Physics and Applied Physics, John Anderson Building, University of Strathclyde, 107 Rottenrow East, Glasgow G4 0NG, Scotland, UK.
authors.forename: E
authors.initials: E
authors.lastname: Normand
authors.forename: M
authors.initials: M
authors.lastname: McCulloch
authors.forename: G
authors.initials: G
authors.lastname: Duxbury
authors.forename: N
authors.initials: N
authors.lastname: Langford