Laser ablation of (GeSe 2 ) 100−x (Sb 2 Se 3 ) x chalcogenide glasses: Influence of the target composition on the plasma plume dynamics

Abstract

Highlights ICCD images revealed the presence of three structures with distinct dynamics Space and time resolved OES measurements revealed the nature of each structure Increased velocities of all three structures were observed for Sb rich samples Excitation temperatures obtained by Boltzmann plots increased as Sb 2 Se 3 was added Plasma characteristics were correlated to the properties of the bulk samples

Experimental and Theoretical Studies on the Dynamics of Transient Plasmas Generated by Laser Ablation in Various Temporal Regimes

“…Such double-structures are often reported in the literature for both fs-and ns-laser ablation, being observed for plume propagating in an ambient gas [14,15,20,88] and in vacuum for high-fluence irradiation [56,57,67,75]. Reports from literature usually present a difference of one order of magnitude between the expansion velocities of the two plasma components.…”

“…An extensive investigation of plasmas generated by ns laser ablation of chalcogenide targets was presented in [75]. We reported there a strong evolution of the global expansion velocity of all three plasma components (derived from ICCD fast camera imaging) and of the excitation temperatures (determined through optical emission spectroscopy) with the thermal and electrical properties of the complex chalcogenide target.…”

“…When using complex (multi-component) targets, the interpretation of the LP temporal profiles is more difficult. For example, we present in Figure 9 the results for laser ablation of a chalcogenide glass (Ge 9.5 Sb 28.6 Se 61.9 ) [75], where three plasma structures are recorded, each of them oscillating with a specific frequency. These structures are also present in ICCD images (see the inset of Figure 9), displaying various expansion velocities.…”

Investigations of Laser Produced Plasmas Generated by Laser Ablation on Geomaterials. Experimental and Theoretical Aspects

“…Each of the two plasma The cross-section on the expansion direction of the recorded images ( Figure 4) shows more clearly the presence of two maxima which were attributed to two plasma components [32]. Due to the difference in their expansion velocities, in literature they can be found as the fast structure (or the "first structure") and slow structure (or the "second structure") [30]. Each of the two plasma structures expands with constant, yet different velocities.…”

“…More information (in terms of plume center-of-mass velocity and wave front dynamics) can be obtained by acquiring ICCD images at various delays. This approach was implemented in the study of simple [29] or complex targets [30], in controlled conditions.…”