Spatio-temporal evaluation of Zr plasma parameters in a single-beam-splitting double-pulse laser-induced plasma

Arnab SARKAR; Manjeet SINGH

doi:10.1088/2058-6272/abd53b

Plasma Science and Technology > 2021 > 23(2): 25503-025503. > DOI: 10.1088/2058-6272/abd53b

Arnab SARKAR, Manjeet SINGH. Spatio-temporal evaluation of Zr plasma parameters in a single-beam-splitting double-pulse laser-induced plasma[J]. Plasma Science and Technology, 2021, 23(2): 25503-025503. DOI: 10.1088/2058-6272/abd53b

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Spatio-temporal evaluation of Zr plasma parameters in a single-beam-splitting double-pulse laser-induced plasma

Arnab SARKAR^1,2,
Manjeet SINGH^1,2

¹ Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
² Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India

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Received Date: October 25, 2020
Revised Date: December 17, 2020
Accepted Date: December 17, 2022

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Abstract

Abstract

The plasma shielding effect is one of the major weaknesses of laser-induced breakdown spectroscopy (LIBS) as it causes non-linearity in signal strength. Although LIBS is typically carried out in constant laser energy, this non-linearity causes a reduction in sensitivity. In this work, we systematically examine laser-induced plasma, formed by two different excitation source modes, i.e. single pulse (SP)-excitation and single-beam-splitting double-pulse (SBS-DP)-excitation over Zr-2.5% Nb alloy. The two most important plasma parameters influencing the emission line intensity, plasma temperature (T_e) and electron density (N_e) were studied and compared for both modes of laser excitation. Comparison of the results conclusively demonstrates that due to the splitting of the laser energy in the SBS-DP mode, the plasma shielding effect is significantly reduced. The reduced plasma shielding translates to an increased laser–sample coupling under SBS-DP mode. Temporal imaging of the total intensity of the laser-induced plasma in both excitation modes was also studied. The study shows how the plasma shielding effect can be reduced to improve the analytical quality of the LIBS methodology.
- LIBS,
- single-beam-splitting,
- double pulse,
- spatial-temporal evolution,
- plasmatemperature,
- electron density

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References (57)

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