Single-shot photofragment imaging by structured illumination
Författare
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
Avdelning/ar
Publiceringsår
2015
Språk
Engelska
Sidor
5019-5022
Publikation/Tidskrift/Serie
Optics Letters
Volym
40
Issue
21
Dokumenttyp
Artikel i tidskrift
Förlag
Optical Society of America
Ämne
- Atom and Molecular Physics and Optics
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0146-9592