Suppression of Raman-resonant interferences in rotational coherent anti-Stokes Raman spectroscopy using time-delayed picosecond probe pulses

Thomas Seeger, Johannes Kiefer, Yi Gao, Brian D. Patterson, Christopher J. Kliewer, Thomas B. Settersten

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

We measure time-dependent pure-rotational coherent anti-Stokes Raman spectroscopy (CARS) spectra for room-temperature N(2), O(2), CO(2), C(2)H(4), and C(3)H(8), as well as in a C(3)H(8) diffusion flame, using picosecond lasers. Because Raman coherences for N(2) and O(2) persist significantly longer than those for the other species, delayed probing can significantly reduce unwanted resonant contributions to rotational coherent anti-Stokes Raman spectroscopy spectra, enabling temperature and relative O(2)/N(2) concentration determination in fuel-rich gas mixtures. Delayed probing also eliminates interference from smeared vibrational CARS. Probe delay affects both the temperature and relative O(2)/N(2) concentrations inferred from rotational spectra when using a standard frequency-domain analysis. (C) 2010 Optical Society of America
Original languageEnglish
Pages (from-to)2040-2042
Number of pages3
JournalOptics Letters
Volume35
Issue number12
DOIs
Publication statusPublished - 15 Jun 2010

Keywords

  • temperature measurements
  • Mixtures
  • CARS
  • N-2
  • Scattering

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