Picosecond Dual-Pulse Laser Ablation of Fused Silica
Applied physics A, Materials science & processing(2022)
摘要
This study discussed the ablation thresholds of picosecond laser dual pulses in fused silica with different temporal separations. The results indicate that the lowest damage threshold of the dual-pulse ablation is at a temporal separation of 100 ps, which is only half of the threshold of the conventional pulse ablation. Furthermore, the energy ratios of two sub-pulses were optimized to minimize the thresholds. Regarding the underlying physical mechanisms, this study found that the first sub-pulses initially excited the electrons of the fused silica, and subsequently induced free-electron shielding and self-trapped exciton seed generation at different temporal separations. This either decreased or increased the material absorption of the second sub-pulses, resulting in changes of the ablation threshold of the fused silica. The results of the picosecond dual-pulse ablation could provide further understanding into the interaction mechanisms of dual pulses to transparent materials.
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关键词
Picosecond dual pulses,Laser ablation,Free-electron shielding,Self-trapped exciton seeds
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