Abstract
The ablation morphology of Cu film is investigated using tailored femtosecond pulse trains. The width, depth, and structure of ablation craters are systematically analyzed as the function of sub-pulse interval. Two distinct ablation sub-structures are observed. The gentle slope irradiated by low fluence emerges from the peripheral region of the ablation crater, and the steep slope formed in the central region is irradiated by high fluence. The ablation morphology can be controlled by manipulating the shaped pulse trains. We demonstrate that the ablation depth modulation is significant with the ablation width almost unchanged. By fitting the depth curves, we define a coefficient K to characterize the plasma shielding effect between sub-pulses with the increase in sub-pulse interval. For three fluences, the coefficient K using two kinds of pulse trains are extracted experimentally. The results reveal that the plasma shielding effect can be modulated by changing sub-pulse interval, and the corresponding physical interpretation is proposed.
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Project supported by the National Natural Science Foundation of China (Grant No. 11374124).
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Deng, J., Qi, H., Zhao, L. et al. Control of ablation morphology on Cu film with tailored femtosecond pulse trains. Appl. Phys. A 126, 425 (2020). https://doi.org/10.1007/s00339-020-03589-0
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DOI: https://doi.org/10.1007/s00339-020-03589-0