Chinese Optics Letters, Volume. 9, Issue 9, 093201(2011)
Femtosecond laser ablation of silicon in air and vacuum
Femtosecond (fs) pulse laser ablation of silicon targets in air and in vacuum is investigated using a time-resolved shadowgraphic method. The observed dynamic process of the fs laser ablation of silicon in air is significantly different from that in vacuum. Similar to the ablation of metallic targets, while the shock wave front and a series of nearly concentric and semicircular stripes, as well as the contact front, are clearly identifiable in the process of ablation under 1£105 Pa, these phenomena are no longer observed when the ablation takes place in vacuum. Although the ambient air around the target strongly affects the evolution of the ablation plume, the three rounds of material ejection clearly observed in the shadowgraphs of fs laser ablation in standard air can also be distinguished in the process of ablation in vacuum. It is proven that the three rounds of material ejection are caused by different ablation mechanisms.
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Zehua Wu, Nan Zhang, Mingwei Wang, Xiaonong Zhu. Femtosecond laser ablation of silicon in air and vacuum[J]. Chinese Optics Letters, 2011, 9(9): 093201
Category: Ultrafast Optics
Received: Mar. 18, 2011
Accepted: Apr. 11, 2011
Published Online: Jul. 29, 2011
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