Resonant holographic measurements of laser ablation plume expansion in vacuum and argon gas backgrounds.

摘要

Resonant Holographic Interferometry (RHI) and Dye-Laser-Resonance-Absorption-Photography (DLRAP) 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 (;The existing theory for the interpretation of resonant holograms has been extended to account for Doppler shift effects, the diagnostic laser bandwidth, and the selective absorption of the laser beam. Results show that fringe shift interpretation is relatively insensitive to parallel expansion temperatures in the range 0.1 eV-1.0 eV.;Absolute-line-densities in the range ;The observed ablation plume expansion in vacuum and for pressures ;Expansion velocities in the range 1.05 cm/