Time-resolved shadowgraphs and morphology analyses of aluminum ablation with multiple femtosecond laser pulses<xref rid="cpb_27_7_077901fn1" ref-type="fn">*</xref><fn id="cpb_27_7_077901fn1"> <label>*</label><p>Project supported by the Science and Technology Development Fund Planning Project for the Universities of Tianjin, China (Grant No. 20140902), the Natural Science Foundation of Tianjin City, China (Grant No. 16JCQNJC01900), the National Natural Science Foundation of China (Grant Nos. 51376136 and 61474082), and the Science and Technology Achievement Award Project for the Universities of Tianjin, China.</p></fn>

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

Project supported by the Science and Technology Development Fund Planning Project for the Universities of Tianjin, China (Grant No. 20140902), the Natural Science Foundation of Tianjin City, China (Grant No. 16JCQNJC01900), the National Natural Science Foundation of China (Grant Nos. 51376136 and 61474082), and the Science and Technology Achievement Award Project for the Universities of Tianjin, China.

Wu Zehua^{1, †}, Zhang Nan^{2, ‡}, Zhu Xiaonong², An Liqun¹, Wang Gangzhi¹, Tan Ming¹

(color online) SEM images of the four ablated regions on the target surface after ablation by (a), (e) 1, (b), (f) 2, (c), (g) 4, and (d), (h) 8 femtosecond laser pulses, respectively. The magnification ratios of the pictures in the first and second rows are 800 and 1600, respectively. The size of the pictures in the first and second rows are 156.8 μm×117.6 μm and 78.4 μm ×58.8 μm, respectively.