Chu Kunpeng, Guo Baoshan, Jiang Lan, Hua Yanhong, Gao Shuai, Jia Jingang, Zhan Ningwei
Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314000, China.
Materials (Basel). 2021 Oct 24;14(21):6355. doi: 10.3390/ma14216355.
In this study, femtosecond laser double pulses were tested to improve their nickel ablation efficiency. The experimental results indicated that compared with single pulses, double pulses with different delay times generated craters with larger diameters and depths. The results obtained for three sets of double pulses with different energy ratios indicated that double pulses with an energy ratio of 1:9 had the highest ablation efficiency, followed by those with energy ratios of 2:8 and 5:5. The double pulses with the aforementioned three energy ratios achieved the maximum ablation efficiency when the delay time was 3-4 ps. Compared with single pulses, double pulses with an energy ratio of 1:9 generated craters with an up to 34% greater depth and up to 14% larger diameter. In addition, an interference effect was observed with a double pulse delay time of 0 ps, which has seldom been reported in the literature. The double pulses were simulated using the two-temperature model. The simulation results indicated that double pulses with an energy ratio of 1:9 with a delay time of 4 ps can perform the strongest ablation. These simulation results are in line with the experimental results.
在本研究中，对飞秒激光双脉冲进行了测试，以提高其对镍的烧蚀效率。实验结果表明，与单脉冲相比，具有不同延迟时间的双脉冲产生的坑洼直径和深度更大。对三组不同能量比的双脉冲所获得的结果表明，能量比为1:9的双脉冲具有最高的烧蚀效率，其次是能量比为2:8和5:5的双脉冲。上述三种能量比的双脉冲在延迟时间为3 - 4皮秒时达到最大烧蚀效率。与单脉冲相比，能量比为1:9的双脉冲产生的坑洼深度增加了34%，直径增加了14%。此外，在双脉冲延迟时间为0皮秒时观察到了干涉效应，这在文献中鲜有报道。使用双温模型对双脉冲进行了模拟。模拟结果表明，延迟时间为4皮秒、能量比为1:9的双脉冲能够实现最强的烧蚀。这些模拟结果与实验结果一致。
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