Single-shot photofragment imaging by structured illumination
Author
Summary, in English
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
Department/s
Publishing year
2015
Language
English
Pages
5019-5022
Publication/Series
Optics Letters
Volume
40
Issue
21
Document type
Journal article
Publisher
Optical Society of America
Topic
- Atom and Molecular Physics and Optics
Status
Published
ISBN/ISSN/Other
- ISSN: 0146-9592