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

Kumada, Takayuki   ; Akagi, Hiroshi; Itakura, Ryuji; Otobe, Tomohito; Yokoyama, Atsushi

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, the reflectivity oscillated with a period of 63 ps for a wavelength 795 nm. The period was reduced by half for 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.

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Category:Physics, Applied

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