The dynamic properties of shock-waves formed during laser ablation at sub-atmospheric pressures

Daniel Kapitan, D. W. Coutts

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The Sedov-Taylor-von Neumann (STN) theory has been shown to accurately describe the dynamic properties of shock-waves generated during pulsed-laser ablation of solid aluminium targets at visible wavelengths (510/578 nm) with 40 ns pulses with energies up to 3.5 mJ. A ballistic pendulum is used to measure the integrated recoil pressure in various inert atmospheres (He, Ne, Ar, Kr, Xe, N2, CO2, SF6) with pressures of 10-2-103 mbar. This recoil momentum is found to scale linearly with the background gas pressure P1 and with the square root of the molecular weight M1. More interestingly, the scaling with the ratio of heat capacities γ is verified to be a monotonically increasing function dependent on the form factor of the shock-wave. The validity of a modified STN theory which accounts for the piston mass is assessed.

LanguageEnglish
Pages205-211
Number of pages7
JournalEurophysics Letters
Volume57
Issue number2
DOIs
Publication statusPublished - 2002
Externally publishedYes

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dynamic characteristics
laser ablation
shock waves
atmospheric pressure
inert atmosphere
pendulums
pistons
ballistics
gas pressure
form factors
molecular weight
pulsed lasers
specific heat
aluminum
momentum
scaling
pulses
wavelengths
energy

Cite this

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abstract = "The Sedov-Taylor-von Neumann (STN) theory has been shown to accurately describe the dynamic properties of shock-waves generated during pulsed-laser ablation of solid aluminium targets at visible wavelengths (510/578 nm) with 40 ns pulses with energies up to 3.5 mJ. A ballistic pendulum is used to measure the integrated recoil pressure in various inert atmospheres (He, Ne, Ar, Kr, Xe, N2, CO2, SF6) with pressures of 10-2-103 mbar. This recoil momentum is found to scale linearly with the background gas pressure P1 and with the square root of the molecular weight M1. More interestingly, the scaling with the ratio of heat capacities γ is verified to be a monotonically increasing function dependent on the form factor of the shock-wave. The validity of a modified STN theory which accounts for the piston mass is assessed.",
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The dynamic properties of shock-waves formed during laser ablation at sub-atmospheric pressures. / Kapitan, Daniel; Coutts, D. W.

In: Europhysics Letters, Vol. 57, No. 2, 2002, p. 205-211.

Research output: Contribution to journalArticleResearchpeer-review

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