Spatiotemporal and emission characteristics of laser-induced plasmas from aluminum-zirconium composite powders

Spatiotemporal evolution of emission and absorption signatures in a laser-produced plasma

“…7 for various distances from the target and for two select times (300 µs and 1000 µs). The spectral fits also accounted for the hyperfine structure of the 27 Al I transition, which was modeled using sums of Voigt functions with equal widths. Further details about the spectral fitting approach can be found elsewhere.…”

“…The spatial analysis of LPP was reported extensively in the literature using emission spectroscopy. 3,8,27,28 However, nearly all previously reported absorption spectroscopic studies of LPPs to date were carried out at a certain distance from the target and the selection of the distance was based on optimizing the signal to noise ratio (SNR). 17,29,30 To the best of the authors' knowledge, no studies exist on the spatial mapping of the ground state population of an LPP system with high temporal precision and a direct comparison to the excited state population.…”

Fast explosive performance prediction via small-dose energetic materials based on time-resolved imaging combined with machine learning

“…Support vector regression (SVR) evolved from SVM and possesses all the advantages of the SVM. In this study, the linear kernel function given by eqn (6) was veried to give the best modeling and prediction results.…”

“…The interaction of a high-energy pulse laser with EMs has attracted wide attention due to its unique advantages in studies of the mechanism of detonation, as well as its small volume, lower consumption, no specimen preparation requirement, and high safety. 6 A high-energy laser pulse with an output energy greater than 500 mJ and pulse duration of ∼10 ns was used to irradiate a thin explosive residue powder, resulting in a typical breakdown event that followed two processes. 7 The initial free electrons were excited by multi-photon ionization (MPI) by the leading edge of the high-intensity laser pulse, and then heated efficiently by the rest of the energy of the laser pulse.…”

Gas-phase oxidation and nanoparticle formation in multi-element laser ablation plumes

“…While molecular and NP formation in LA plumes has been explored previously, [3][4][5][6][7][8][9] limited experimental work has been able to characterize gas to solid phase processes in bi-and multielement LA plumes. 10 In part, this gap is due to the challenging nature of tracking the progression from ions and atoms, diatoms, larger molecules, aerosols, and finally particulates, which requires multiple complementary techniques that together cover several orders of magnitude in time. 11 NPs are studied in numerous application areas from understanding debris formation in an explosion event to nanotechnology-based applications such as catalysis, electronics, sensing, and batteries.…”