Hybrid femtosecond/picosecond coherent anti‐Stokes Raman scattering for high‐speed CH4/N2 measurements in binary gas mixtures
作者： Sascha R. Engel , Joseph D. Miller , Chloe E. Dedic , Thomas Seeger , Alfred Leipertz
DOI: 10.1002/JRS.4261
关键词: Mole fraction 、 Raman scattering 、 Chirp 、 Femtosecond 、 Coherent anti-Stokes Raman spectroscopy 、 Atomic physics 、 Raman spectroscopy 、 Chemistry 、 Optics 、 Picosecond 、 Excitation
摘要: Hybrid femtosecond/picosecond (fs/ps) vibrational coherent anti-Stokes Raman scattering was demonstrated for high-speed, in-situ measurements of CH4/N2 mole fractions in binary gas mixtures with temporal nonresonant suppression. A single broadband, 100-fs laser source used to simultaneously excite CH4 and N2 transitions, characterized by a spectral separation ~584 cm−1, followed frequency-domain detection time-delayed ps probe pulse. In this manner, the evolution background wavepackets could be evaluated maximize signal minimize interferences. typical accuracy ~95% achieved experimental between 0.02 0.70, precision ~4% maximizing relative excitation energy through induced chirp pump Stokes pulses. It further shown that mole-fraction were not affected variations bi-molecular broadened linewidths over wide range mixture fractions. Copyright © 2013 John Wiley & Sons, Ltd.
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