title: Precision of multiplex CARS temperatures using both single-mode and multimode pump lasers.
abstract: The noise level in single-pulse resonant nitrogen CARS spectra is shown to decrease with increasing pump laser bandwidth. This is the reverse of the trend observed for nonresonant CARS spectra. The precision of single-pulse CARS temperature measurements is shown to be dramatically increased by performing a weighted fit of theoretical and experimental CARS spectra using the measured detector noise coefficients as weighting parameters. The inclusion of collisional narrowing and cross-coherence in the CARS theory calculations and their effect on best fit temperatures are discussed. These temperatures, measured in a flat-flame burner, are compared with those obtained by Na line-reversal.
authors.forename: D R
authors.initials: DR
authors.lastname: Snelling
authors.forename: G J
authors.initials: GJ
authors.lastname: Smallwood
authors.forename: R A
authors.initials: RA
authors.lastname: Sawchuk
authors.forename: T
authors.initials: T
authors.lastname: Parameswaran