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Hybrid fs/ps vibrational coherent anti-Stokes Raman scattering for simultaneous gas-phase N2/O2/CO2 measurements

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Abstract

Single-shot, 1-kHz measurements of temperatures and mole fraction ratios along with theoretical modeling for gas-phase ${{\rm N}_2}$, ${{\rm O}_2}$, and ${{\rm CO}_2}$ are demonstrated using hybrid femtosecond/picosecond (fs/ps) vibrational coherent anti-Stokes Raman scattering (CARS). The combination of broadband pump and Stokes pulses covers a spectral range over ${1800}\;{{\rm cm}^{- 1}}$ while the narrowband probe pulses generated from a quasi-common-path second harmonic bandwidth compressor (QCP-SHBC) resolves the molecular structures with a bandwidth of ${\sim}{7}\;{{\rm cm}^{- 1}}$. Temperature results of 1700–2000 K in methane/air fuel-lean flames show state-of-the-art inaccuracies of less than ${\sim}{3}\%$ and precision less than 2%. Mole fraction ratios inaccuracy at room temperature is ${\sim}{5}\%$, and precision at flame temperatures are 6%–8%.

© 2021 Optical Society of America

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