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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 5 — Feb. 27, 2012
  • pp: 5003–5010

Interference-free gas-phase thermometry at elevated pressure using hybrid femtosecond/picosecond rotational coherent anti-Stokes Raman scattering

Joseph D. Miller, Chloe E. Dedic, Sukesh Roy, James R. Gord, and Terrence R. Meyer  »View Author Affiliations

Optics Express, Vol. 20, Issue 5, pp. 5003-5010 (2012)

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Rotational-level-dependent dephasing rates and nonresonant background can lead to significant uncertainties in coherent anti-Stokes Raman scattering (CARS) thermometry under high-pressure, low-temperature conditions if the gas composition is unknown. Hybrid femtosecond/picosecond rotational CARS is employed to minimize or eliminate the influence of collisions and nonresonant background for accurate, frequency-domain thermometry at elevated pressure. The ability to ignore these interferences and achieve thermometric errors of <5% is demonstrated for N2 and O2 at pressures up to 15 atm. Beyond 15 atm, the effects of collisions cannot be ignored but can be minimized using a short probe delay (~6.5 ps) after Raman excitation, thereby improving thermometric accuracy with a time- and frequency-resolved theoretical model.

© 2012 OSA

OCIS Codes
(280.1740) Remote sensing and sensors : Combustion diagnostics
(300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering
(300.6530) Spectroscopy : Spectroscopy, ultrafast
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.5390) Ultrafast optics : Picosecond phenomena

ToC Category:

Original Manuscript: November 7, 2011
Revised Manuscript: December 20, 2011
Manuscript Accepted: December 23, 2011
Published: February 13, 2012

Joseph D. Miller, Chloe E. Dedic, Sukesh Roy, James R. Gord, and Terrence R. Meyer, "Interference-free gas-phase thermometry at elevated pressure using hybrid femtosecond/picosecond rotational coherent anti-Stokes Raman scattering," Opt. Express 20, 5003-5010 (2012)

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