Plume Splitting and Sharpening in Laser-Produced Aluminum Plasma
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Plume splitting and sharpening in laser-produced aluminium plasma
Plume splitting and sharpening were observed in laser-produced aluminium plasma created using 532 nm, 8 ns pulses from a frequency doubled Nd : YAG laser. Measurements were made using 2 ns gated fast photography as well as space and time resolved optical emission spectroscopy. The motion of the leading edge of the plume was studied with several background air pressures and the expansion of the ...
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The effect of ambient gas on the expansion dynamics of the plasma generated by laser ablation of an aluminum target has been investigated using frequency doubled radiation from a Q-switched Nd:YAG laser. The diagnostic tools include fast photography of overall visible plume emission using a 2 ns gated intensified charged coupled device and space and time resolved emission spectroscopy using a 5...
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The plume dynamics in the presence of an ambient gas is very intriguing physics. The expansion of a laser-produced plasma in the presence of an ambient gas leads to internal plume structures, plume splitting, sharpening, confinement, etc. We investigated propagation dynamics of an expanding tin plume for various spot sizes using a fast visible plume imaging and Faraday cup diagnostic tools. Our...
متن کاملSurface instability of multipulse laser ablation on a metallic target
Large scale wavelike patterns are observed on an aluminum surface after it is ablated by a series of KrF laser pulses ~248 nm, 40 ns, 5 J/cm!. These surface structures have a wavelength on the order of 30 mm, much longer than the laser wavelength. We postulate that these wave patterns are caused by the Kelvin–Helmholtz instability at the interface between the molten aluminum and the plasma plum...
متن کاملResonant holographic interferometry measurements of laser ablation plumes in vacuum, gas, and plasma environments
Resonant holographic interferometry and dye-laser-resonance-absorption photography have been utilized to investigate the expansion of the laser ablation plumes produced by a KrF excimer laser beam (248 nm) focused onto an aluminum target (-0.1 cm’, 2-6 J/cm’). Plume expansion was studied in vacuum and in background argon gas pressures of 14 mTorr, 52 mTorr, 210 mTorr, 1 Torr, and 35 Ton: The ex...
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تاریخ انتشار 2002