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Fourier-based approach to overcome anomalies in high-resolution spectra of vibrational CARS measurements of gases

Nordström, Emil LU ; Bengtsson, Per-Erik LU and Marrocco, M. (2014) In Journal of Raman Spectroscopy 45(7). p.489-494
Abstract
In this work, we report on an unconventional experimental procedure useful for thermometric measurements on the basis of high-resolution vibrational coherent anti-Stokes Raman scattering (CARS) generated using conventional lasers. The high spectral dispersion of 0.02 cm(-1)/pixel is achieved by means of some specific spectral arrangements (single-mode pump laser and diffraction grating providing spectra at the sixth order) and is further strengthened by the use of a relay lens system mounted before the charge-coupled device camera. Surprisingly, at the high spectral dispersion of our measurements, a significant and persistent thermometric inaccuracy is observed. The effect arises from an inevitable spectral modulation of defined frequency... (More)
In this work, we report on an unconventional experimental procedure useful for thermometric measurements on the basis of high-resolution vibrational coherent anti-Stokes Raman scattering (CARS) generated using conventional lasers. The high spectral dispersion of 0.02 cm(-1)/pixel is achieved by means of some specific spectral arrangements (single-mode pump laser and diffraction grating providing spectra at the sixth order) and is further strengthened by the use of a relay lens system mounted before the charge-coupled device camera. Surprisingly, at the high spectral dispersion of our measurements, a significant and persistent thermometric inaccuracy is observed. The effect arises from an inevitable spectral modulation of defined frequency hidden in the main CARS signal of the gas under study, and to secure a good thermometric evaluation, we describe a Fourier approach that is experimentally demonstrated for the typical nitrogen CARS spectrum measured at room temperature. Copyright (C) 2014 John Wiley & Sons, Ltd. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
coherent anti-Stokes Raman scattering, laser spectroscopy, spectroscopic, techniques
in
Journal of Raman Spectroscopy
volume
45
issue
7
pages
489 - 494
publisher
John Wiley & Sons
external identifiers
  • wos:000339420000002
  • scopus:84904166030
ISSN
1097-4555
DOI
10.1002/jrs.4464
language
English
LU publication?
yes
id
ad1dbec7-66b5-48f8-8d59-dde5ff1bbfe5 (old id 4590744)
date added to LUP
2014-09-04 14:23:38
date last changed
2017-01-01 06:33:30
@article{ad1dbec7-66b5-48f8-8d59-dde5ff1bbfe5,
  abstract     = {In this work, we report on an unconventional experimental procedure useful for thermometric measurements on the basis of high-resolution vibrational coherent anti-Stokes Raman scattering (CARS) generated using conventional lasers. The high spectral dispersion of 0.02 cm(-1)/pixel is achieved by means of some specific spectral arrangements (single-mode pump laser and diffraction grating providing spectra at the sixth order) and is further strengthened by the use of a relay lens system mounted before the charge-coupled device camera. Surprisingly, at the high spectral dispersion of our measurements, a significant and persistent thermometric inaccuracy is observed. The effect arises from an inevitable spectral modulation of defined frequency hidden in the main CARS signal of the gas under study, and to secure a good thermometric evaluation, we describe a Fourier approach that is experimentally demonstrated for the typical nitrogen CARS spectrum measured at room temperature. Copyright (C) 2014 John Wiley & Sons, Ltd.},
  author       = {Nordström, Emil and Bengtsson, Per-Erik and Marrocco, M.},
  issn         = {1097-4555},
  keyword      = {coherent anti-Stokes Raman scattering,laser spectroscopy,spectroscopic,techniques},
  language     = {eng},
  number       = {7},
  pages        = {489--494},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Raman Spectroscopy},
  title        = {Fourier-based approach to overcome anomalies in high-resolution spectra of vibrational CARS measurements of gases},
  url          = {http://dx.doi.org/10.1002/jrs.4464},
  volume       = {45},
  year         = {2014},
}