Plume dynamics from UV pulsed ablation of Al and Ti

William Bauer; Glen Perram; Timothy Haugan

doi:10.1117/12.2245185

6 December 2016 Plume dynamics from UV pulsed ablation of Al and Ti

William Bauer, Glen Perram, Timothy Haugan

Author Affiliations +

Proceedings Volume 10014, Laser-Induced Damage in Optical Materials 2016; 100140S (2016) https://doi.org/10.1117/12.2245185
Event: SPIE Laser Damage, 2016, Boulder, Colorado, United States

Abstract

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.

Citation Download Citation

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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