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Detection of atomic oxygen in a plasma-assisted flame via a backward lasing technique

Ding, Pengji LU orcid ; Ruchkina, Maria LU ; Del Cont-Bernard, Davide ; Ehn, Andreas LU ; Lacoste, Deanna A. and Bood, Joakim LU (2019) In Optics Letters 44(22). p.5477-5480
Abstract

In this Letter, we have investigated 845 nm lasing generation in atomic oxygen, present in a lean methane-air flame, using two-photon pumping with femtosecond 226 nm laser pulses, particularly focusing on the impact of nanosecond repetitively pulsed glow discharges forcing on the backward lasing signal. Characterizations of the backward lasing pulse, in terms of its spectrum, beam profile, pump pulse energy dependence, and divergence, were conducted to establish the presence of lasing. With plasma forcing of the flame, the backward lasing signal was observed to be enhanced significantly, ∼50%. The vertical concentration profile of atomic oxygen was revealed by measuring the backward lasing signal strength as a function of height in the... (More)

In this Letter, we have investigated 845 nm lasing generation in atomic oxygen, present in a lean methane-air flame, using two-photon pumping with femtosecond 226 nm laser pulses, particularly focusing on the impact of nanosecond repetitively pulsed glow discharges forcing on the backward lasing signal. Characterizations of the backward lasing pulse, in terms of its spectrum, beam profile, pump pulse energy dependence, and divergence, were conducted to establish the presence of lasing. With plasma forcing of the flame, the backward lasing signal was observed to be enhanced significantly, ∼50%. The vertical concentration profile of atomic oxygen was revealed by measuring the backward lasing signal strength as a function of height in the flame. The results are qualitatively consistent with results obtained with two-dimensional femtosecond two-photon-absorption laser-induced fluorescence, suggesting that the backward lasing technique can be a useful tool for studies of plasma-assisted combustion processes, particularly in geometries requiring single-ended standoff detection.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Letters
volume
44
issue
22
pages
4 pages
publisher
Optical Society of America
external identifiers
  • scopus:85075113770
  • pmid:31730087
ISSN
0146-9592
DOI
10.1364/OL.44.005477
language
English
LU publication?
yes
id
a0c10774-a933-44a5-a1e2-f49430c6cfbd
date added to LUP
2020-04-23 10:44:45
date last changed
2024-06-12 13:46:04
@article{a0c10774-a933-44a5-a1e2-f49430c6cfbd,
  abstract     = {{<p>In this Letter, we have investigated 845 nm lasing generation in atomic oxygen, present in a lean methane-air flame, using two-photon pumping with femtosecond 226 nm laser pulses, particularly focusing on the impact of nanosecond repetitively pulsed glow discharges forcing on the backward lasing signal. Characterizations of the backward lasing pulse, in terms of its spectrum, beam profile, pump pulse energy dependence, and divergence, were conducted to establish the presence of lasing. With plasma forcing of the flame, the backward lasing signal was observed to be enhanced significantly, ∼50%. The vertical concentration profile of atomic oxygen was revealed by measuring the backward lasing signal strength as a function of height in the flame. The results are qualitatively consistent with results obtained with two-dimensional femtosecond two-photon-absorption laser-induced fluorescence, suggesting that the backward lasing technique can be a useful tool for studies of plasma-assisted combustion processes, particularly in geometries requiring single-ended standoff detection.</p>}},
  author       = {{Ding, Pengji and Ruchkina, Maria and Del Cont-Bernard, Davide and Ehn, Andreas and Lacoste, Deanna A. and Bood, Joakim}},
  issn         = {{0146-9592}},
  language     = {{eng}},
  number       = {{22}},
  pages        = {{5477--5480}},
  publisher    = {{Optical Society of America}},
  series       = {{Optics Letters}},
  title        = {{Detection of atomic oxygen in a plasma-assisted flame via a backward lasing technique}},
  url          = {{https://lup.lub.lu.se/search/files/83006809/Paper_Detection_of_atomic_oxygen_in_a_plasma_Ding_et_al_2019_.pdf}},
  doi          = {{10.1364/OL.44.005477}},
  volume       = {{44}},
  year         = {{2019}},
}