Atomistic modeling of femtosecond laser-induced melting and atomic mixing in Au film – Cu substrate system

Laser Acoustic Probing of Two‐Temperature Zone Created by Femtosecond Pulse

“…In the 1T stage the propagation of thermal wave is slow (subsonic), the melting continues due to heterogenous nucleation at the melting front, and the two-phase mixture zone becomes narrow. This observation about fast and slow stages of heat penetration agrees with works [7,8]. At a late time (∼ 0.1 − 1 ns) a molten layer starts to solidify from a depth of target, but not from frontal surface.…”

Chemometrics and theoretical approaches for evaluation of matrix effect in laser ablation and ionization of metal samples

“…Considering the fact that the utilization of fs-laser can minimize matrix effect compared with ns-laser, the statistical result further reveals it is the reduction of thermal effect in fs-laser-solid interaction process that makes its matrix effect less severe. Due to the high irradiance and short duration of fs-laser, it turns solid directly into vapor and minimizes heating of lattice [32,33]; as a result the whole process is less affected by thermal properties of solid. While for ns-laser, its duration is far longer than the thermal transmission time between thermal electrons and lattice (nearly 10 ps) [50], which is enough for thermal wave to propagate into the bulk and the area beyond the irradiated zone.…”

“…Many studies have been reported about the matrix effect during laser ablation process by comparing nanosecond (ns) laser with femtosecond (fs) laser [12,21,[29][30][31]. One of the reasons may be that the high irradiance and short duration of fs-laser could extensively minimize heating of the lattice [32,33].…”

Surface ablation and threshold determination of AlCu4SiMg aluminum alloy in picosecond pulsed laser micromachining

“…So far, ultrafast pulsed laser ablation thresholds of several typical materials have been investigated. In the aspect of metal materials, many studies have focused on stainless steel, gold, silver, copper, platinum, tungsten, chromium, niobium, molybdenum, nickel, nickel-base alloy, titanium, and titanium alloy [13][14][15][16][17][18][19][20][21][22][23][24]; however, ablation mechanisms and thresholds of aluminum and its alloys have not been extensively investigated, and the available few studies on aluminum and its alloys generally focused on the micro-nanostructure characteristics of ultrafast laser processing, laser-induced breakdown spectroscopy, and laser shock peening on pure aluminum or aluminum alloy. Jorgensen et al [25] formed the nanoparticles using femtosecond laser ablation in intermetallic aluminum-nickel (NiAl) alloy.…”