Femtosecond laser ablation dynamics of fused silica extracted from oscillation of time-resolved reflectivity

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[1] Kumada, Takayuki
[2] Itakura, Ryuji
[3] Otobe, Tomohito
[4] Yokoyama, Atsushi
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| 1600年 / American Institute of Physics Inc.卷 / 115期
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Femtosecond laser ablation dynamics of fused silica is examined via time-resolved reflectivity measurements. After optical breakdown was caused by irradiation of a pump pulse with fluence Fpump = 3.3-14.9 J/cm 2; the reflectivity oscillated with a period of 63 ± 2 ps for a wavelength λ = 795 nm. The period was reduced by half for λ = 398 nm. We ascribe the oscillation to the interference between the probe pulses reflected from the front and rear surfaces of the photo-excited molten fused silica layer. The time-resolved reflectivity agrees closely with a model comprising a photo-excited layer which expands due to the formation of voids; and then separates into two parts; one of which is left on the sample surface and the other separated as a molten thin layer from the surface by the spallation mechanism. Such oscillations were not observed in the reflectivity of soda-lime glass. Whether the reflectivity oscillates or not probably depends on the layer viscosity while in a molten state. Since viscosity of the molten fused silica is several orders of magnitude higher than that of the soda-lime glass at the same temperature; fused silica forms a molten thin layer that reflects the probe pulse; whereas the soda-lime glass is fragmented into clusters. © 2014 AIP Publishing LLC;
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