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Applied Optics

Applied Optics


  • Vol. 37, Iss. 9 — Mar. 20, 1998
  • pp: 1690–1701

Annular phase-matched dual-pump coherent anti-Stokes Raman spectroscopy system for the simultaneous detection of nitrogen and methane

Stephen M. Green, Paul J. Rubas, Mark A. Paul, James E. Peters, and Robert P. Lucht  »View Author Affiliations

Applied Optics, Vol. 37, Issue 9, pp. 1690-1701 (1998)

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The concentration and pressure dependence of dual-pump coherent anti-Stokes Raman spectroscopy (CARS) signals from nitrogen and methane was investigated. CARS spectra were acquired from a gas cell at pressures of 0.007 to 2.24 MPa and methane concentrations of 0.5 to 50%. The square root of the methane signal intensity divided by the nitrogen signal intensity was found to have a near-linear dependence on methane concentration at all pressures investigated. The pressure dependence of this integrated intensity ratio decreased with increasing pressure and became negligible at the highest pressures tested. The shot-to-shot variation at concentrations determined from single-laser-shot measurements was less than 7%. Single-laser-shot CARS spectra of nitrogen and methane were obtained from the cylinder of a firing direct-injection natural gas engine.

© 1998 Optical Society of America

OCIS Codes
(060.5060) Fiber optics and optical communications : Phase modulation
(290.5860) Scattering : Scattering, Raman
(300.0300) Spectroscopy : Spectroscopy

Original Manuscript: April 30, 1997
Revised Manuscript: November 20, 1997
Published: March 20, 1998

Stephen M. Green, Paul J. Rubas, Mark A. Paul, James E. Peters, and Robert P. Lucht, "Annular phase-matched dual-pump coherent anti-Stokes Raman spectroscopy system for the simultaneous detection of nitrogen and methane," Appl. Opt. 37, 1690-1701 (1998)

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