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Four-wave mixing with non-resonant pump and resonant probe for OH detection in flames

Sun, Zhiwei LU ; Kiefer, J.; Li, Zhongshan LU ; Li, Bo LU and Aldén, Marcus LU (2008) In Applied Physics B 92(2). p.287-293
Abstract
A new type of two-color four-wave mixing spectroscopy is theoretically and experimentally demonstrated. By employing a non-resonant pumping and resonant probing scheme, OH radicals are detected in a laminar, atmospheric pressure methane/air flame as a proof-of-principle experiment. Two 532 nm laser beams from a multi-mode Nd:YAG laser are utilized to create an electrostrictive grating in the flame. A probe beam in resonance with the Q(1)( 5) rotational line belonging to the A(2)Sigma-X-2 Pi(1,0) band at 283 nm is employed to achieve species selective detection of OH radicals. In detail, in the present paper the coherence effects of the pump beams are investigated by changing the temporal delay between the two pump beams. A signal enhanced... (More)
A new type of two-color four-wave mixing spectroscopy is theoretically and experimentally demonstrated. By employing a non-resonant pumping and resonant probing scheme, OH radicals are detected in a laminar, atmospheric pressure methane/air flame as a proof-of-principle experiment. Two 532 nm laser beams from a multi-mode Nd:YAG laser are utilized to create an electrostrictive grating in the flame. A probe beam in resonance with the Q(1)( 5) rotational line belonging to the A(2)Sigma-X-2 Pi(1,0) band at 283 nm is employed to achieve species selective detection of OH radicals. In detail, in the present paper the coherence effects of the pump beams are investigated by changing the temporal delay between the two pump beams. A signal enhanced by a factor of 3 is obtained in the coherence range. Furthermore, the dependence of the signal intensity on the laser pulse energy of the pump and probe beams is studied in detail. At high pulse energies even for the pumping process a certain saturation behavior is observed. In general, the demonstrated four-wave mixing scheme is estimated to be superior in terms of the saturation limitation in comparison to the widely applied degenerate four-wave mixing, but still providing a high sensitivity and species selectivity due to the strong resonant signal enhancement. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
92
issue
2
pages
287 - 293
publisher
Springer
external identifiers
  • wos:000257775800025
  • scopus:47749137327
ISSN
0946-2171
DOI
10.1007/s00340-008-3067-6
language
English
LU publication?
yes
id
a4cbeeda-3f9f-43d9-b570-5032a3468a9a (old id 1253971)
date added to LUP
2008-11-03 15:17:38
date last changed
2017-11-19 03:35:17
@article{a4cbeeda-3f9f-43d9-b570-5032a3468a9a,
  abstract     = {A new type of two-color four-wave mixing spectroscopy is theoretically and experimentally demonstrated. By employing a non-resonant pumping and resonant probing scheme, OH radicals are detected in a laminar, atmospheric pressure methane/air flame as a proof-of-principle experiment. Two 532 nm laser beams from a multi-mode Nd:YAG laser are utilized to create an electrostrictive grating in the flame. A probe beam in resonance with the Q(1)( 5) rotational line belonging to the A(2)Sigma-X-2 Pi(1,0) band at 283 nm is employed to achieve species selective detection of OH radicals. In detail, in the present paper the coherence effects of the pump beams are investigated by changing the temporal delay between the two pump beams. A signal enhanced by a factor of 3 is obtained in the coherence range. Furthermore, the dependence of the signal intensity on the laser pulse energy of the pump and probe beams is studied in detail. At high pulse energies even for the pumping process a certain saturation behavior is observed. In general, the demonstrated four-wave mixing scheme is estimated to be superior in terms of the saturation limitation in comparison to the widely applied degenerate four-wave mixing, but still providing a high sensitivity and species selectivity due to the strong resonant signal enhancement.},
  author       = {Sun, Zhiwei and Kiefer, J. and Li, Zhongshan and Li, Bo and Aldén, Marcus},
  issn         = {0946-2171},
  language     = {eng},
  number       = {2},
  pages        = {287--293},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {Four-wave mixing with non-resonant pump and resonant probe for OH detection in flames},
  url          = {http://dx.doi.org/10.1007/s00340-008-3067-6},
  volume       = {92},
  year         = {2008},
}