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.

© 1987 Optical Society of America

Single pulse CARS noise: a comparison between single-mode and multimode pump lasers

D. R. Snelling, R. A. Sawchuk, and R. E. Mueller
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Noise characteristics of single-shot broadband CARS signals

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Precision of multiplex CARS temperature measurements

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