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Latest Developments on Hybrid fs/ps CARS for Combustion Sensing

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Abstract

Vibrational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS) is employed for temperature measurements in an adiabatic flame from 1300 – 2400 K. The low-temperature limit of fs/ps CARS is extended using pure-rotational fs/ps CARS for gas-phase measurements of N2, O2, and air down to room temperature. Relative concentration measurements are also performed. Sensitivity of the measurements to the effects of line broadening at varying temperature and pressure is discussed in the context of a time- and frequency-resolved theoretical model.

© 2012 Optical Society of America

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