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Single-shot photofragment imaging by structured illumination

Larsson, Kajsa LU ; Jonsson, Malin LU ; Borggren, Jesper LU ; Kristensson, Elias LU ; Ehn, Andreas LU ; Aldén, Marcus LU and Bood, Joakim LU (2015) In Optics Letters 40(21). p.5019-5022
Abstract
A laser method to suppress background interferences in pump - probe measurements is presented and demonstrated. The method is based on structured illumination, where the intensity profile of the pump beam is spatially modulated to make its induced photofragment signal distinguishable from that created solely by the probe beam. A spatial lock-in algorithm is then applied on the acquired data, extracting only those image components that are characterized by the encoded structure. The concept is demonstrated for imaging of OH photofragments in a laminar methane/air flame, where the signal from the OH photofragments produced by the pump beam is spatially overlapping with that from the naturally present OH radicals. The purpose was to perform... (More)
A laser method to suppress background interferences in pump - probe measurements is presented and demonstrated. The method is based on structured illumination, where the intensity profile of the pump beam is spatially modulated to make its induced photofragment signal distinguishable from that created solely by the probe beam. A spatial lock-in algorithm is then applied on the acquired data, extracting only those image components that are characterized by the encoded structure. The concept is demonstrated for imaging of OH photofragments in a laminar methane/air flame, where the signal from the OH photofragments produced by the pump beam is spatially overlapping with that from the naturally present OH radicals. The purpose was to perform for the first time, to the best of our knowledge, single-shot imaging of HO2 in a flame. These results show an increase in signal-to-interference ratio of about 20 for single-shot data. (C) 2015 Optical Society of America (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Letters
volume
40
issue
21
pages
5019 - 5022
publisher
Optical Society of America
external identifiers
  • wos:000364468600050
  • scopus:84957592399
ISSN
0146-9592
DOI
10.1364/OL.40.005019
language
English
LU publication?
yes
id
d422e24c-fe32-412d-8d74-2687cba71712 (old id 8380503)
date added to LUP
2015-12-18 13:39:15
date last changed
2017-07-23 04:11:02
@article{d422e24c-fe32-412d-8d74-2687cba71712,
  abstract     = {A laser method to suppress background interferences in pump - probe measurements is presented and demonstrated. The method is based on structured illumination, where the intensity profile of the pump beam is spatially modulated to make its induced photofragment signal distinguishable from that created solely by the probe beam. A spatial lock-in algorithm is then applied on the acquired data, extracting only those image components that are characterized by the encoded structure. The concept is demonstrated for imaging of OH photofragments in a laminar methane/air flame, where the signal from the OH photofragments produced by the pump beam is spatially overlapping with that from the naturally present OH radicals. The purpose was to perform for the first time, to the best of our knowledge, single-shot imaging of HO2 in a flame. These results show an increase in signal-to-interference ratio of about 20 for single-shot data. (C) 2015 Optical Society of America},
  author       = {Larsson, Kajsa and Jonsson, Malin and Borggren, Jesper and Kristensson, Elias and Ehn, Andreas and Aldén, Marcus and Bood, Joakim},
  issn         = {0146-9592},
  language     = {eng},
  number       = {21},
  pages        = {5019--5022},
  publisher    = {Optical Society of America},
  series       = {Optics Letters},
  title        = {Single-shot photofragment imaging by structured illumination},
  url          = {http://dx.doi.org/10.1364/OL.40.005019},
  volume       = {40},
  year         = {2015},
}