Direct measurement of CO₂ S-branch Raman linewidths broadened by O₂, Ar, and C₂H₄

Abstract

Direct measurements of ${\mathrm{CO}}_2$ $S$-branch Raman coherence-decay lifetimes resulting from ${\mathrm{CO}}_2–{\mathrm{O}}_2$, ${\mathrm{CO}}_2–\mathrm{Ar}$, and ${\mathrm{CO}}_2–{\mathrm{C}}_2{\mathrm{H}}_4$ collisions by employing time-resolved picosecond rotational coherent anti-Stokes Raman scattering (CARS) spectroscopy are reported. Based on the measured Raman coherence dephasing rates, the corresponding Raman linewidths of various $J$ levels are obtained. Our measured linewidth data will aid ${\mathrm{CO}}_2$ CARS fitting, which is applied to the high-accuracy extraction of temperature and species concentration information from CARS spectra.

© 2019 Optical Society of America

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