Modeling of dynamical processes in laser ablation

Abstract

Various physics and computational approaches have been developed to globally characterize phenomena important for film growth by pulsed-laser deposition of materials. These include thermal models of laser-solid target interactions that initiate the vapor plume, plume ionization and heating through laser absorption beyond local thermodynamic equilibrium mechanisms, hydrodynamic and collisional descriptions of plume transport, and molecular dynamics models of the interaction of plume particles with the deposition substrate.

Electron density and temperature measurements in a laser produced carbon plasma

“…For the transition at 392 nm, ⌬E mn ϭ 3.16 eV, the lowest limit for n e is 6.3ϫ10 15 cm Ϫ3 . Our calculated values of n e are much greater than this limit implying that LTE approximation for this analysis is valid.…”

“…[12][13][14] However, relatively little quantitative information is available on either the fundamental graphite plasma parameters, like electron temperature, electron density etc., or on the nature of the dominant plume excitation processes in different spatial and temporal regions of the expanding plasma. Such data are required in order to develop and test models of plasma processes 15,16 and enable us to evaluate the energy transport into the plasma with regard to temporal and local behavior as well as its effectiveness.…”

Dépôt de films minces par ablation laser, le potentiel industriel

“…Ce processus parasite constitue aujourd'hui une limitation importante au développement industriel de la technique PLD. Le principe de cette technique, objet de nombreux articles de revue [4][5][6][7][8], est illustré dans la figure 1. Ce procédé occupe une niche étroite parmi l'ensemble des techniques de traitement de la matière par irradiation au moyen d'un laser puisé.…”

Modeling of UV pulsed-laser ablation of metallic targets

“…Fähler and Krebs [20], and Svendsen et al [14] model the attenuation due to the evaporating gas in front of the target by applying the same optical properties to the solid and the produced vapor, but they did not consider in detail vapor heating and ionization. More recently, several theoretical and experimental works have drawn attention to the importance of photo-ionization (PI) of excited neutrals [6,9,10,16,18,21] and numerical models of the laser ablation of metallic targets, taking into account the laser absorption and ionization mechanisms into the vapor, have been proposed [6,16,18].…”

“…Recently, a great effort has been put into fundamental studies of the laser-ablation process of simple one-component targets, such as metals, to gain a better knowledge of the basic mechanisms involved in the laser-solid-plasma interaction [5,9,10,[12][13][14][15]. Moreover, since the thermo-physical properties of metal are comparatively well known, numerical models have been proposed by several groups and compared to experimental data [5,6,14,[16][17][18]. Several authors report many theoretical works on the modeling of the laser ablation process [5,6,13,[17][18][19][20].…”