Abstract
Experiments have been performed which demonstrate that the ratio of resonant to nonresonant third-order susceptibilities measured in multiplex USED CARS are affected by the time correlation of the pump fields. Comparing the resonant to nonresonant signal ratio obtained with decorrelated fields to the ratio obtained with correlated fields, a relative increase of 2.5 was measured for the nitrogen Q-branch, whereas a corresponding increase of 1.9 was observed for the hydrogen Q(1)-line. To compare our experimental results with theoretical calculations of the spectral shapes, the nonresonant third-order susceptibilities of a number of gases were re-evaluated by calibrating to the nonresonant susceptibility of argon.
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Lange, B., Wolfrum, J. The impact of laser field statistics in determination of temperature and concentration by multiplex USED CARS. Appl. Phys. B 51, 53–58 (1990). https://doi.org/10.1007/BF00332325
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DOI: https://doi.org/10.1007/BF00332325