Hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering for high-speed gas-phase thermometry

Optics Letters
Joseph D MillerJames R Gord

Abstract

We demonstrate hybrid femtosecond/picosecond (fs/ps) coherent anti-Stokes Raman scattering for high-speed thermometry in unsteady high-temperature flames, including successful comparisons with a time- and frequency-resolved theoretical model. After excitation of the N(2) vibrational manifold with 100 fs broadband pump and Stokes beams, the Raman coherence is probed using a frequency-narrowed 2.5 ps probe beam that is time delayed to suppress the nonresonant background by 2 orders of magnitude. Experimental spectra were obtained at 500 Hz in steady and pulsed H(2)-air flames and exhibit a temperature precision of 2.2% and an accuracy of 3.3% up to 2400 K. Strategies for real-time gas-phase thermometry in high-temperature flames are also discussed, along with implications for kilohertz-rate measurements in practical combustion systems.

Citations

Oct 30, 2015·Optics Letters·Sukesh RoyJames R Gord
Dec 24, 2018·The Journal of Chemical Physics·Trevor L Courtney, Christopher J Kliewer
Nov 29, 2012·Optics Express·Paul J WrzesinskiJames R Gord
Oct 16, 2018·Optics Letters·Hans U StaufferTerrence R Meyer
Jun 1, 2016·Optics Letters·Michał NejbauerCzesław Radzewicz

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