Time-resolved shadowgraphs and morphology analyses of aluminum ablation with multiple femtosecond laser pulses

• 来源期刊: 中国物理B（英文版）
• 关键词: femtosecond laser ablation ultrafast phenomena time-resolved shadowgraphs morphology anal-yses
• 年，卷（期）: 2018,（7）
• 页码范围: 613-620
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/7/077901

摘要

Aluminum ablation by multiple femtosecond laser pulses is investigated via time-resolved shadowgraphs and scanning electron microscope (SEM) images of the ablation spot. The spatial distribution of the ejected material and the radius of the shock wave generated during the ablation are found to vary with the increase in the number of pulses. In the initial two pulses, nearly concentric and semicircular stripes within the shock wave front are observed, unlike in subsequent pulses. Ablation by multiple femtosecond pulses exhibits different characteristics compared with the case induced by single femtosecond pulse because of the changes to the aluminum target surface induced by the preceding pulses.