Subpicosecond laser ablation behavior of a magnesium target and crater evolution: Molecular dynamics study and experimental validation

doi:10.1088/1674-1056/ad3ef8

Abstract The micro-ablation processes and morphological evolution of ablative craters on single-crystal magnesium under subpicosecond laser irradiation are investigated using molecular dynamics (MD) simulations and experiments. The simulation results exhibit that the main failure mode of single-crystal Mg film irradiated by a low fluence and long pulse width laser is the ejection of surface atoms, which has laser-induced high stress. However, under high fluence and short pulse width laser irradiation, the main damage mechanism is nucleation fracture caused by stress wave reflection and superposition at the bottom of the film. In addition, Mg$[0\,0\,0\,1]$ has higher pressure sensitivity and is more prone to ablation than Mg$[1\,0\,\overline 1 \,0]$. The evolution equation of crater depth is established using multi-pulse laser ablation simulation and verified by experiments. The results show that, under multiple pulsed laser irradiation, not only does the crater depth increase linearly with the pulse number, but also the quadratic term and constant term of the fitted crater profile curve increase linearly.

Keywords: laser-material interaction molecular dynamics (MD) simulation ablation crater morphology magnesium

Received: 20 January 2024
Revised: 29 March 2024
Accepted manuscript online: 16 April 2024

PACS:	79.20.Eb	(Laser ablation)
	79.20.Ds	(Laser-beam impact phenomena)
	81.15.Fg	(Pulsed laser ablation deposition)

Corresponding Authors: Xia Zhou
E-mail: zhouxia@dlut.edu.cn

Cite this article:

Guolong Jiang(江国龙) and Xia Zhou(周霞) Subpicosecond laser ablation behavior of a magnesium target and crater evolution: Molecular dynamics study and experimental validation 2024 Chin. Phys. B 33 077901

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Subpicosecond laser ablation behavior of a magnesium target and crater evolution: Molecular dynamics study and experimental validation

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