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Proceedings Paper

Investigation of the dynamic process of high fluence femtosecond laser ablation of aluminum by ultrafast time-resolved shadowgraphy
Author(s): Zehua Wu; Nan Zhang; Weiwei Liu; Mingwei Wang; Jianjun Yang; Xiaonong Zhu
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Paper Abstract

The dynamic process of 800 nm high fluence femtosecond laser ablation of aluminum is revealed by ultrafast time-resolved shadowgraphs. Both single and multiple laser pulses at perpendicular or oblique incidence are employed in the experiment. It is demonstrated that femtosecond laser ablation of aluminum with a fluence of 40 J/cm2 is a complex process involving both photothermal and photomechanical mechanisms. For a single ablation pulse, the propagation direction of the ejected material remains normal to the target surface regardless of the incidence angle of the laser. For the multiple pulses ablation with an oblique incidence angle, the propagation direction of the ejected material deviates from the normal of the target surface gradually as the number of ablation pulses increases due to the topographic change of the ablated region.

Paper Details

Date Published: 18 February 2009
PDF: 8 pages
Proc. SPIE 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications, 72760V (18 February 2009); doi: 10.1117/12.823364
Show Author Affiliations
Zehua Wu, Nankai Univ. (China)
Nan Zhang, Nankai Univ. (China)
Weiwei Liu, Nankai Univ. (China)
Mingwei Wang, Nankai Univ. (China)
Jianjun Yang, Nankai Univ. (China)
Xiaonong Zhu, Nankai Univ. (China)


Published in SPIE Proceedings Vol. 7276:
Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications
Peixiang Lu; Katsumi Midorikawa; Bernd Wilhelmi, Editor(s)

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