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https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00028643
2023-01-16T04:21:06Z
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Plasma-assisted laser ablation of tungsten: Reduction in ablation power threshold due to bursting of holes/bubbles
Kajita, Shin
Ohno, Noriyasu
Takamura, Shuichi
Sakaguchi, Wataru
Nishijima, Dai
open access
Copyright 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.The following article appeared in (Applied Physics Letters. v.91, n.26, 2007, p.261501) and may be found at (http://dx.doi.org/10.1063/1.2824873).
Nanosecond laser ablation of tungsten (W) exposed to helium plasma is investigated using optical emission spectroscopy. Submicrometer-sized holes/bubbles are formed on the surface of W when it was exposed to the helium plasma at a sufficiently high temperature (≳1500–1600K). The emissions from a virgin W (before the helium plasma irradiation) cannot be detected when the fluence is <1J/cm2; however, the threshold fluence for the detection of neutral W emission after it was exposed to the helium plasma is ∼0.2J/cm^2. The physical mechanism of laser-induced bursting of holes/bubbles is proposed for achieving a significant reduction in ablation power threshold.
AIP Publishing
2007-12
eng
journal article
VoR
http://hdl.handle.net/2237/00030833
https://nagoya.repo.nii.ac.jp/records/28643
https://doi.org/10.1063/1.2824873
0003-6951
Applied Physics Letters
91
26
261501
https://nagoya.repo.nii.ac.jp/record/28643/files/1_2824873.pdf
application/pdf
775.0 kB
2019-10-30