Abstract
We have applied a picosecond time-domain coherent active (anti-Stokes) Raman spectroscopy (CARS) technique to the study of the dephasing kinetics in a free supersonic jet of N2. We have directly detected the oscillatory decay of free optical polarization induced in molecules in a jet by a pair of picosecond pulses with properly chosen frequencies ω1 and ω2 (so that ω 1- ω2≃ΩQ, the mean frequency of ro-vibrational transitions in the Q-brach) probed by a delayed picosecond pulse of frequency ω. The pulses at ω1 and ω2 were provided by a mode-locked Nd:YAG laser (λ1 = 1.06μm, τp = 20 ps), and LiNbO3 optical parametric oscillator (λ2 =1.4 μm, fwhm Δv≃20 cm–1) pumped with the second harmonic (SH) of the main oscillator, the portion of the last SH pulse after a variable delay being used as a probe ω pulse.
© 1984 Optical Society of America
PDF ArticleMore Like This
H. Graener, A. Laubereau, and J. W. Nibler
WGG1 International Quantum Electronics Conference (IQEC) 1984
W. Zinth, M.C. Nuss, and W. Kaiser
TuE4 International Conference on Ultrafast Phenomena (UP) 1984
Sukesh Roy, Terrence R. Meyer, and James R. Gord
MD6 Laser Applications to Chemical, Security and Environmental Analysis (LACSEA) 2006