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Applied Optics

Applied Optics


  • Vol. 42, Iss. 33 — Nov. 20, 2003
  • pp: 6757–6767

High-resolution broadband N2 coherent anti-Stokes Raman spectroscopy: comparison of measurements for conventional and modeless broadband dye lasers

Joel P. Kuehner, Mark A. Woodmansee, Robert P. Lucht, and J. Craig Dutton  »View Author Affiliations

Applied Optics, Vol. 42, Issue 33, pp. 6757-6767 (2003)

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We have performed high-resolution N2 coherent anti-Stokes Raman spectroscopy (CARS) measurements using a modeless dye laser (MDL) as the Stokes beam source to determine the effects of a reduction in mode noise on the accuracy and precision of the method. These results are compared with previous research that employed a conventional broadband dye laser (CBDL) as the Stokes beam source. A new spectral-fitting procedure was developed to avoid starting-point bias in the least-squares fitting results, which possibly had altered the previous measurements. Single-shot measurements of pressure were performed in a static-pressure vessel over the range of 0.1–4.0 atm to examine the pressure sensitivity of the technique. The precision of these measurements is a measure of the baseline noise level of the system, which sets the detection limit for flow-field pressure fluctuations. Centerline measurements of pressure and temperature in an underexpanded jet (M j = 1.85) were also used to determine the performance of the technique in a compressible flow field. Our study represents the first known application, to our knowledge, of a MDL CARS system in a low-temperature, low-pressure supersonic environment. Improvements in accuracy for mean single-shot measurements and increased precision were found for pressure vessel conditions above 1.0 atm. For subatmospheric pressure vessel conditions (0.1–1.0 atm) and the underexpanded jet measurements, there was a decrease in accuracy and precision compared with the CBDL results. A comparison with the CBDL study is included, along with a discussion of the MDL system behavior.

© 2003 Optical Society of America

OCIS Codes
(280.2490) Remote sensing and sensors : Flow diagnostics
(300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering
(300.6420) Spectroscopy : Spectroscopy, nonlinear
(300.6450) Spectroscopy : Spectroscopy, Raman

Original Manuscript: February 10, 2003
Revised Manuscript: June 24, 2003
Published: November 20, 2003

Joel P. Kuehner, Mark A. Woodmansee, Robert P. Lucht, and J. Craig Dutton, "High-resolution broadband N2 coherent anti-Stokes Raman spectroscopy: comparison of measurements for conventional and modeless broadband dye lasers," Appl. Opt. 42, 6757-6767 (2003)

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