Characteristics of plasma plume expansion from Al target induced by oblique incidence of 1064 and 355 nm nanosecond Nd : YAG laser

Spatiotemporal spectroscopic characterization of plasmas induced by non-orthogonal laser ablation

“…This is likely caused by the ionization predominantly taking place at the shockwave boundaries 46 . As discussed earlier and according to existing reports 13,14 , the shockwave created by non-orthogonal ablation is more complex than the one created by orthogonal ablation. Consequently, the less homogeneous ionic emissivity profiles with respect to the orthogonal case likely result from the different height dependency of the interaction of the laser radiation with the shockwave.…”

“…The direction of the plasma's expansion has been further investigated by schlieren imaging 13 and shadowgraphy techniques 14 . Both studies reported that the plasma expands along the incident laser pulse.…”

Plasma Generation and Application in a Laser Ablation Pulsed Plasma Thruster

“…There are many sources of error for operating this thrust stand which must be identified, then quantified in order to evaluate the accuracy of the impulse bit measurement. It is shown in the expression (20) that the impulse bit is calculated from the voltage values of PSD signals and the coefficients in calibration procedures, A, A 0 , B and B 0 . Therefore, the uncertainties in the system data and results can be categorized into two main types.…”

“…In addition, the ablation plasma absorbs part of laser Plasma Science and Technology -Basic Fundamentals and Modern Applications energy, and causes the density, temperature, pressure and components in the ablation plasma plume dramatically vary, which has an significant effect on the thrust performance. During the years, the expansion dynamics of pulsed laser generated plasma plume has been widely investigated through experimental and numerical methods [19][20][21][22][23]. Especially, several models have been proposed to describe the expansion of ablation plasma and the formation of plasma in the plume [21].…”

Shadowgraph investigation of plasma shock wave evolution from Al target under 355-nm laser ablation

“…In an earlier report, we also presented the evolution of a plasma plume from an Al target ablated with a nanosecond 1064-nm and 355-nm lasers respectively at oblique incidence in air with different focusing conditions. [14] It was found that the evolution of the plasma plume was strongly influenced by the laser wavelength in the case of oblique incidence. Up to now, most of the studies have been carried out on the plasma shock wave expansion induced by IR nanosecond laser pulses or femtosecond laser pulses which ablate a fixed-position target under different conditions.…”