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

Abstract

Plasmas induced with large ablation angles are less temporally stable and less spatially homogenous, which should be considered during quantitative analysis by laser-induced breakdown spectroscopy.

Spectral correction study to reduce the influence of sample surface morphology on laser-induced breakdown spectroscopy

“…Studies have found that minor differences in the focusing distance can affect the spatial homogeneity of the plasma. 6,7 A change in the laser incident angle also leads to plasma asymmetry, 8 causing much larger spectral variations than that caused by laser pulse uctuations. 9 Breves et al found that spectral intensity of the emission line decreased by 28% when the incidence and collection angles changed from 0°to ±60°.…”

Spectral library transfer between distinct laser-induced breakdown spectroscopy systems trained on simultaneous measurements

“…8 As a trade-off for its instrumental robustness, LIBS exhibits a high sensitivity to changes in the analyzed target's topography 9 and matrix. 10 More importantly, LIBS is signicantly affected by the changes in experimental conditions (such as ablation 11,12 and collection geometry 13 ). A complete list of physics-related factors responsible for the structure of spectra is beyond the scope of this work and was described elsewhere.…”

Effects of sample surface morphology on laser-induced breakdown spectroscopy

“…The surface morphology of the sample can be characterized by surface relief and surface roughness. The variable surface relief of the sample will cause the change of LIBS system parameters, such as lens-to-sample distance (LTSD), and laser incident 10,11 and collection angles. 12 Shao J. et al 13 proved that the line intensities of copper and electron temperature rst increase and then drop with the increase of LTSD.…”