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• W2897742938 abstract "Excimer laser ablation of materials in air at an ambient pressure of 1 bar with typical energy densities between 3 and 47 J/cm2 and a pulse length of 30 ns (FWHM) leads to gasdynamic discontinuities and the development of a plasma plume above the target. Those phenomena affect the exactness of the achieveable geometry as well as the efficiency of the ablation process and the debris formation in the environment of the irradited area. The discontinuities have been observed using fast schlieren photography, shadowgraphy and interferometry. Emphasis was laid on their temporal development during the laser pulse. The time resolution of the images is less than 1 Ns. Five discontinuities could be discerned, and it was found that within the time interval of the laser pulse the principle structure is independent of the investigated material (PVC, AI and Cu are presented here). A physical interpretation of the discontinuities is given along the lines of existing theories and plausible reasoning based on the observations. The outmost discontinuity, a shock front, described by many authors can be explained by the classical Sedov-Taylor blast wave theory. This theory can be used to estimate the energy content of the shock wave. Close up to the first discontinuity follows a second one that is interpreted as the ionisation front. A third one, the contact front, which seperates shocked air and ablated material vapour has a complex structure and expansion behaviour. Furthermore, time resolved measurements of the laser radiation transmitted through the extincting plasma plume will be presented. From these results conclusions can be drawn about the efficiency of the ablation process depending on the energy density as well as on the amount of the energy deposited. The experiments have further shown that immediately after reaching the laser pulse plateau the energy coupling to the target drastically decreases. As an example, the energy loss by the extinction mechanisms in the plasma plume can be up to 80% at an energy density of about 30 J/cm2. The different behaviour between apolymere sample and a metal sample will be discussed. Finally, the interaction mechanisms resulting in an extinction of the incident laser energy in the plasma plume will be discussed. It was found that inverse bremsstrahlung, which is the dominant mechanism in CO2 laser treatment, has no significant influence in the case of 248 nm radiation. Rayleigh scattering at nanometer-sized particles, on the other hand, is found to be a possible mechanism for an explanation of the experimental results. Results of calculations will be compared to experiments.Excimer laser ablation of materials in air at an ambient pressure of 1 bar with typical energy densities between 3 and 47 J/cm2 and a pulse length of 30 ns (FWHM) leads to gasdynamic discontinuities and the development of a plasma plume above the target. Those phenomena affect the exactness of the achieveable geometry as well as the efficiency of the ablation process and the debris formation in the environment of the irradited area. The discontinuities have been observed using fast schlieren photography, shadowgraphy and interferometry. Emphasis was laid on their temporal development during the laser pulse. The time resolution of the images is less than 1 Ns. Five discontinuities could be discerned, and it was found that within the time interval of the laser pulse the principle structure is independent of the investigated material (PVC, AI and Cu are presented here). A physical interpretation of the discontinuities is given along the lines of existing theories and plausible reasoning based on the observat..." @default.
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• W2897742938 date "1995-01-01" @default.
• W2897742938 modified "2023-09-26" @default.
• W2897742938 title "Observation and interpretation of gasdynamic discontinuities induced by pulsed laser ablation and their influence on the energy coupling" @default.
• W2897742938 doi "https://doi.org/10.2351/1.5058975" @default.
• W2897742938 hasPublicationYear "1995" @default.
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