Influence of Target Cavity Formation on the Emission Spectra of Nanosecond Laser Ablation Plasmas

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 t...

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Bibliographic Details
Published in:Plasma and Fusion Research 2022/04/08, Vol.17, pp.2406018-2406018
Main Authors: James Edward A. HERNANDEZ II, YAMADA, Shinnosuke, SASAKI, Shouta, CATAPANG, Allen Vincent, WADA, Motoi
Format: Article
Language:English
Subjects:
laser ablation
laser induced breakdown spectroscopy
optical emission spectroscopy
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Summary: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.
ISSN:1880-6821
1880-6821
DOI:10.1585/pfr.17.2406018