Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 6: Correlation dynamics in plasmas and clusters II

A 6.5: Vortrag

Montag, 12. März 2012, 15:45–16:00, V57.01

A collisional-radiative model for ns-pulsed laser ablation of metals — •David Autrique and Baerbel Rethfeld — TU Kaiserslautern, 67663 Kaiserslautern, Germany

Laser ablation is nowadays used in a growing number of applications, such as chemical analysis and pulsed laser deposition. Despite the many applications, the technique is still poorly understood. Therefore a model, describing the time dependent material evolution after short pulse laser irradiation, can be a helpful tool during the research quest. The transient behavior in and above a ns-laser irradiated copper target is modeled. Ultrafast phase transitions occur in the liquid, overheated layer. Subsequently a dense mixture of liquid and vapor is ejected above the target. Here a collisional-radiative model accounts for the laser-produced plasma kinetics. Stepwise collisional excitation, ionization, as well as photo processes result in plasma formation in the dense, expanding vapor plume. Calculated transmission profiles are compared with experimental results and similar trends are found.