Ablation threshold behavior of femtosecond laser twin double-pulse processing of solids

Kaihu Zhang; JiaBo Zhang; Ning Zhang; Xiaohui Zhang; Liyan Zheng; Yi Yue; Ze Gao; Yongliang Gao; Mingyu Lu

doi:10.1117/12.2587567

2 December 2020 Ablation threshold behavior of femtosecond laser twin double-pulse processing of solids

Kaihu Zhang, JiaBo Zhang, Ning Zhang, Xiaohui Zhang, Liyan Zheng, Yi Yue, Ze Gao, Yongliang Gao, Mingyu Lu

Proceedings Volume 11717, 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics; 1171739 (2020) https://doi.org/10.1117/12.2587567
Event: 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics, 2020, Shanghai, China

Abstract

We carried out a comparative study on ablation threshold behavior of femtosecond laser twin double-pulse processing of typical transparent material, semiconductors and metallic materials. Based on the change of ablation area with pulse temporal separation (100 fs-15ps) under the same spatially distributed Gaussian beam, influence of pulse-separation on normalized double-pulse ablation threshold (which is normalized to the single-pulse ablation threshold) was demonstrated qualitatively. Special attention paid on the variation characteristics of normalized double-pulse ablation threshold in the sub-picosecond pulse-separation range, as well as its value in pulse-separations comparable or larger than the electron-phonon (or ion) coupling time. We show that the ablation threshold behavior of femtosecond laser twin double-pulse is strongly material-specie dependent, however, can be summarized in to several ones. The difference in ionization and/or deionization mechanisms for the non-metal compared is possibly the physical origins for the contrasted behavior of double-pulse ablation threshold.

Citation Download Citation

Kaihu Zhang, JiaBo Zhang, Ning Zhang, Xiaohui Zhang, Liyan Zheng, Yi Yue, Ze Gao, Yongliang Gao, and Mingyu Lu "Ablation threshold behavior of femtosecond laser twin double-pulse processing of solids", Proc. SPIE 11717, 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics, 1171739 (2 December 2020); https://doi.org/10.1117/12.2587567

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