6 December 2016 Plume dynamics from UV pulsed ablation of Al and Ti
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Pulsed laser ablation of Al and Ti with a < 3.3 J/cm2 KrF laser and Ar background pressure of up to 1 Torr was performed to study the ablated plume. Mass loss experiments revealed the number of ablated atoms per pulse increases by ~30% for Ti and ~20% for Al as pressure decreases from 1 Torr to vacuum. Optical emission imaging performed using a gated ICCD revealed a strong dependence of shock front parameters, defined by the Sedov-Taylor blast and classical drag models, on background pressure. Spatially resolved optical emission spectroscopy from Al I, Al II, Ti I, and Ti II revealed ion temperatures of 104 K that decreased away from the target surface along the surface normal and neutral temperatures of 103 K independent of target distance. Comparison between kinetic energy in the shock and internal excitation energy reveals that nearly 100% of the energy is partitioned into shock front kinetic energy and ~1% into internal excitation.
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William Bauer, William Bauer, Glen Perram, Glen Perram, Timothy Haugan, Timothy Haugan, } "Plume dynamics from UV pulsed ablation of Al and Ti", Proc. SPIE 10014, Laser-Induced Damage in Optical Materials 2016, 100140S (6 December 2016); doi: 10.1117/12.2245185; https://doi.org/10.1117/12.2245185

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