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.

DOI: 10.1364/AO.26.000099

Cite this paper

@article{Snelling1987PrecisionOM, title={Precision of multiplex CARS temperatures using both single-mode and multimode pump lasers.}, author={David Snelling and Greg J. Smallwood and Robert A. Sawchuk and Tirumaran Parameswaran}, journal={Applied optics}, year={1987}, volume={26 1}, pages={99-110} }