Publication detail

Tomography of double-pulse laser-induced plasmas in the orthogonal geometry

KÉPEŠ, E. GORNUSHKIN, I. POŘÍZKA, P. KAISER, J.

Original Title

Tomography of double-pulse laser-induced plasmas in the orthogonal geometry

Type

journal article in Web of Science

Language

English

Original Abstract

The temporal evolution of laser-induced plasmas is studied in the orthogonal double-pulse arrangement. Both the pre-ablation mode (an air spark is induced above the sample surface prior to the ablation pulse) and the re-heating mode (additional energy is delivered into the plasma created by the ablation pulse) is considered. The plasmas are investigated in terms of the temporal evolution of their electron density, temperature, and volume. The plasma volumes are determined using a time-resolved tomography technique based on the Radon transformation. The reconstruction is carried out for both white-light and band-pass filtered emissivities. The white-light reconstruction corresponds to the overall size of the plasmas. On the other hand, the band-pass emissivity reconstruction shows the distribution of the atomic sample species (Cu I). Moreover, through spectrally resolved tomographic reconstruction, the spatial homogeneity of the electron density and temperature of the plasmas is also investigated at various horizontal slices of the plasmas. Our results show that the pre-ablation geometry yields a more temporally stable and spatially uniform plasma, which could be beneficial for calibration-free laser-induced breakdown spectroscopy (LIBS) approaches. On the contrary, the plasma generated in the re-heating geometry exhibits significant variations in electron density and temperature along its vertical axis. Overall, our results shed further light on the mechanisms involved in the LIBS signal enhancement using double-pulse ablation.

Keywords

laser-induced plasma, laser-induced breakdown spectroscopy, double-pulse laserinduced breakdown spectroscopy, plasma tomography, Radon reconstruction

Authors

KÉPEŠ, E.; GORNUSHKIN, I.; POŘÍZKA, P.; KAISER, J.

Released

14. 8. 2020

Publisher

Elsevier

ISBN

0003-2670

Periodical

ANALYTICA CHIMICA ACTA

Number

1135

State

Kingdom of the Netherlands

Pages from

1

Pages to

11

Pages count

11

URL

https://www.sciencedirect.com/science/article/pii/S0003267020308096

BibTex

@article{BUT164636,
  author="Erik {Képeš} and Igor {Gornushkin} and Pavel {Pořízka} and Jozef {Kaiser}",
  title="Tomography of double-pulse laser-induced plasmas in the orthogonal geometry",
  journal="ANALYTICA CHIMICA ACTA",
  year="2020",
  number="1135",
  pages="1--11",
  doi="10.1016/j.aca.2020.06.078",
  issn="0003-2670",
  url="https://www.sciencedirect.com/science/article/pii/S0003267020308096"
}