Plasma and Fusion Research

Volume 17, 2406018 (2022)

Regular Articles

Influence of Target Cavity Formation on the Emission Spectra of Nanosecond Laser Ablation Plasmas
James Edward A. HERNANDEZ II, Shinnosuke YAMADA, Shouta SASAKI, Allen Vincent CATAPANG and Motoi WADA
Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0394, Japan
(Received 10 January 2022 / Accepted 20 February 2022 / Published 8 April 2022)

Abstract

Optical emission spectroscopy as well as time-of-flight (TOF) measurements were performed in the diagnostics of nanosecond laser produced plasmas. The target is rotated during pulsed laser ablation at 5 GW/cm2, where the optical emission spectroscopy is performed along, as well as perpendicular to the target axis. Parallel to the target axis, the continuum radiation intensity increases up to 6000 pulses, and emission line intensities from C I and C II increase for with number of pulses. Perpendicular to the target axis, decrease in emission line and continuum intensities were observed. TOF measurements resulted to carbon cluster ions detection from Cn+, n ≥ 2, where peak shift of 4 μs towards later times were observed after 10000 pulses ablation. Charge collection experiments showed approximately 80 percent energy loss after 10000 shots. Collision-induced recombination mechanisms were suggested as causes of energy loss and line intensity decrease.

Keywords

laser induced breakdown spectroscopy, laser ablation, optical emission spectroscopy

DOI: 10.1585/pfr.17.2406018

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