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Nonthermal effects on femtosecond laser ablation dynamics studied using time-resolved reflectivity with double pump pulses

Kumada, Takayuki   ; Otobe, Tomohito; Nishikino, Masaharu; Hasegawa, Noboru; Hayashi, Terutake*

Dynamics of the formation of a spallation layer during femtosecond laser ablation of fused silica has been studied using time-resolved reflectivity with double pump pulses. Oscillation of the reflectivity, which is due to interference between the reflected probe pulses at the bulk sample surface and the spallation layer, is enhanced when the second pump pulse is irradiated within the time interval, $$tau$$s, of a few picoseconds after the first pump pulse. However, as $$tau$$s increases, the oscillation amplitude decreases with an exponential decay time of 10 ps. This result suggests that it takes approximately 10 ps for formation of the spallation layer.

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