Strategies for suppressing elastically scattered laser light in ungated laser-induced breakdown spectroscopy

Andrew Pressley Williamson, Johannes Kiefer* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

When an ungated detector is used for recording the signal in laser-induced breakdown spectroscopy (LIBS), elastically scattered laser light can represent a severe interference significantly limiting the dynamic range. Hence, a suitable filter must be selected from a variety of choices. In this Note, we compare different filter types and demonstrate that the filter needs to be chosen taking the experimental setup and the measurement object into account. For this purpose, dichroic and colored glass long pass filters, a dielectric Notch filter and three polarization filtering approaches are considered. Regarding the latter, a novel approach employing a half-wave plate in the laser beam is introduced and tested. Reckoning experimental data and the physical filter mechanisms allows providing guidelines for making an informed choice.

Original languageEnglish
Pages (from-to)267-270
Number of pages4
JournalSpectrochimica Acta. Part B: Atomic Spectroscopy
Volume149
Early online date15 Sep 2018
DOIs
Publication statusPublished - Nov 2018

Keywords

  • Laser-induced breakdown spectroscopy
  • LIBS
  • Filter
  • Elastic light scattering
  • EQUIVALENCE RATIO MEASUREMENTS

Cite this

Strategies for suppressing elastically scattered laser light in ungated laser-induced breakdown spectroscopy. / Williamson, Andrew Pressley; Kiefer, Johannes (Corresponding Author).

In: Spectrochimica Acta. Part B: Atomic Spectroscopy, Vol. 149, 11.2018, p. 267-270.

Research output: Contribution to journalArticle

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abstract = "When an ungated detector is used for recording the signal in laser-induced breakdown spectroscopy (LIBS), elastically scattered laser light can represent a severe interference significantly limiting the dynamic range. Hence, a suitable filter must be selected from a variety of choices. In this Note, we compare different filter types and demonstrate that the filter needs to be chosen taking the experimental setup and the measurement object into account. For this purpose, dichroic and colored glass long pass filters, a dielectric Notch filter and three polarization filtering approaches are considered. Regarding the latter, a novel approach employing a half-wave plate in the laser beam is introduced and tested. Reckoning experimental data and the physical filter mechanisms allows providing guidelines for making an informed choice.",
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AB - When an ungated detector is used for recording the signal in laser-induced breakdown spectroscopy (LIBS), elastically scattered laser light can represent a severe interference significantly limiting the dynamic range. Hence, a suitable filter must be selected from a variety of choices. In this Note, we compare different filter types and demonstrate that the filter needs to be chosen taking the experimental setup and the measurement object into account. For this purpose, dichroic and colored glass long pass filters, a dielectric Notch filter and three polarization filtering approaches are considered. Regarding the latter, a novel approach employing a half-wave plate in the laser beam is introduced and tested. Reckoning experimental data and the physical filter mechanisms allows providing guidelines for making an informed choice.

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