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

Abstract

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 F{sub pump} = 3.3–14.9 J/cm{sup 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.

Authors:
; ; ; ;  [1]
  1. Quantum Beam Science Directorate, Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizugawa, Kyoto 619-0215 (Japan)
Publication Date:
OSTI Identifier:
22277914
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; GLASS; LASER RADIATION; LAYERS; OSCILLATIONS; PULSED IRRADIATION; PULSES; REFLECTIVITY; SILICA; SODIUM CARBONATES; SURFACES; THIN FILMS; TIME RESOLUTION; VISCOSITY

Citation Formats

Kumada, Takayuki, E-mail: kumada.takayuki@jaea.go.jp, Akagi, Hiroshi, Itakura, Ryuji, Otobe, Tomohito, and Yokoyama, Atsushi. Femtosecond laser ablation dynamics of fused silica extracted from oscillation of time-resolved reflectivity. United States: N. p., 2014. Web. doi:10.1063/1.4867438.
Kumada, Takayuki, E-mail: kumada.takayuki@jaea.go.jp, Akagi, Hiroshi, Itakura, Ryuji, Otobe, Tomohito, & Yokoyama, Atsushi. Femtosecond laser ablation dynamics of fused silica extracted from oscillation of time-resolved reflectivity. United States. doi:10.1063/1.4867438.
Kumada, Takayuki, E-mail: kumada.takayuki@jaea.go.jp, Akagi, Hiroshi, Itakura, Ryuji, Otobe, Tomohito, and Yokoyama, Atsushi. 2014. "Femtosecond laser ablation dynamics of fused silica extracted from oscillation of time-resolved reflectivity". United States. doi:10.1063/1.4867438.
@article{osti_22277914,
title = {Femtosecond laser ablation dynamics of fused silica extracted from oscillation of time-resolved reflectivity},
author = {Kumada, Takayuki, E-mail: kumada.takayuki@jaea.go.jp and Akagi, Hiroshi and Itakura, Ryuji and Otobe, Tomohito and Yokoyama, Atsushi},
abstractNote = {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 F{sub pump} = 3.3–14.9 J/cm{sup 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.},
doi = {10.1063/1.4867438},
journal = {Journal of Applied Physics},
number = 10,
volume = 115,
place = {United States},
year = 2014,
month = 3
}
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