A surprising phenomenon can be discovered by using femtosecond double-pulse ablation of silicon and germa- nium in ethanol. Tile ablation areas present an oscillation increase phenomenon when the pulse delay increases...A surprising phenomenon can be discovered by using femtosecond double-pulse ablation of silicon and germa- nium in ethanol. Tile ablation areas present an oscillation increase phenomenon when the pulse delay increases from 200 fs to 1 ps in the fluence range of 0.5-0.6 3/cm2. In contrast, the ablation areas exhibit an oscillation decrease phenonmnon as the pulse delay increases when the laser fluence F 〈 0.5 J/cm9, which is consistent with the results of the experiment in air. It is considered that the adjustment of the photon-electron coupling efficiency by pulse train technology plays an important role in the ablation process.展开更多
基金supported by the National Basic Research Program of China(973 Program)(Grant No.2011CB013000)the National Natural Science Foundation of China(NSFC)(Grant Nos.91323301 and 51375051)
文摘A surprising phenomenon can be discovered by using femtosecond double-pulse ablation of silicon and germa- nium in ethanol. Tile ablation areas present an oscillation increase phenomenon when the pulse delay increases from 200 fs to 1 ps in the fluence range of 0.5-0.6 3/cm2. In contrast, the ablation areas exhibit an oscillation decrease phenonmnon as the pulse delay increases when the laser fluence F 〈 0.5 J/cm9, which is consistent with the results of the experiment in air. It is considered that the adjustment of the photon-electron coupling efficiency by pulse train technology plays an important role in the ablation process.
