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Proceedings Paper

Plume dynamics from UV pulsed ablation of Al and Ti
Author(s): William Bauer; Glen Perram; Timothy Haugan
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Paper 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.

Paper Details

Date Published: 6 December 2016
PDF: 11 pages
Proc. SPIE 10014, Laser-Induced Damage in Optical Materials 2016, 100140S (6 December 2016);
Show Author Affiliations
William Bauer, Air Force Institute of Technology (United States)
Glen Perram, Air Force Institute of Technology (United States)
Timothy Haugan, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 10014:
Laser-Induced Damage in Optical Materials 2016
Greg J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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