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Excimer laser destruction of micrometer size particles in a gas volume (2001)

Hopp, B. ; Smausz, T. ; Rácz, A. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 89 (2001), S. 1493-1496

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: ArF excimer laser ablation of micrometer size smoke grains was investigated. It was demonstrated that this procedure is suitable for destruction of these particulates in consequence of very fast heating, oxidation, burning, and evaporation. The time-resolved investigations revealed that the destruction process takes place between 0 and 7 ns after the maximum of the excimer pulse. The efficiency of breaking into small pieces was found to be dependent on the excimer laser fluence. Atomic force microscopic investigations of the sedimented smoke particles proved that the size of the grains significantly decreased by the excimer laser radiation. © 2001 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1334633

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Comparative time-resolved study of solid-state and liquid ablation of polyethylene-glycol 1000: temperature, viscosity and surface tension dependence (2000)

Hopp, B. ; Smausz, T. ; Wittmann, T. ; [et al.]

Springer

Applied physics 71 (2000), S. 315-318

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ISSN: 1432-0630

Keywords: PACS: 64.70; 65.70.+y

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Abstract. Comparative study of solid and liquid phase ablation on the same sample by time-resolved investigations is presented in this paper. Polyethylene-glycol (PEG) 1000 having relatively low melting point (35 °C) was used in our experiments. By varying the sample temperature in the 20–80 °C range we could study the ablation mechanism in both solid and liquid (below and above the melting point) state of matter. An ArF excimer laser (λ=193 nm, FWHM=20 ns) was used for ablation at 1.95 J/cm2 fluence. Ablation processes were observed by transmission fast photographic arrangement. It was demonstrated that plasma development and expansion (primer ablation, in 0–50 ns time range), formation and propagation parameters of shock wave and contact front did not depend on sample temperature and state of matter. The secondary material ejection (between 1–100 μs) showed a strong temperature dependence. Material ejection in the case of solid target occurred in the form of dense material cloud, and in the form of splashing for liquid (molten) sample. The ejection velocity of splashed jets depended on the sample temperature, significantly. This can be due to the change of molten PEG 1000 viscosity.