Study of spectral intensity of the laser ablated tungsten plasma and ablation mass at various laser spot sizes and laser fluence in vacuum environment

Atomic spectrometry update: review of advances in the analysis of metals, chemicals and materials

“…A study by Liu et al investigated the ablation features of in situ LIBS for quantitative diagnosis of plasma–wall interaction processes on the first wall or divertor in tokamaks. 162 Parameters investigated included spot size and crater volume. The spot size was found to affect the spectral intensity significantly, with an optimum value of 1.16 mm for the observed W ionic and atomic lines at a 200 mJ laser energy.…”

Simulation Analysis of Dynamic Damage Probability Modelling for Laser Systems

“…Here, r denotes radius, (x center , y center ) denotes the centre point of the spot, and W and H denote the width and height of the receiving screen, respectively. 2 The data corresponding to the circular outer rectangle of the radius is taken out and the cumulative intensity and the percentage of energy in the whole receiving screen is calculated as shown in Equation (20).…”

“…When M enters effective range, the position of target M is (4582. 5,2000,20) and the position of ship P is (2000,2000,0). When the target is at a distance of 5 km, according to Equation ( 9), the far-field spot area can be calculated as 81.91 cm 2 .…”

“…In [5], the authors established a laser weapon power density model based on the analysis of the transmission characteristics of the laser in the atmosphere and the tracking errors. In [6], the authors take the effects of atmospheric transmissions and the far-field spot area of the laser system into consideration, simulating the effectiveness of a 10,000-watt high-energy laser system by calculating the atmospheric transmittance [7,8], the quality of the laser beam after being affected by atmospheric turbulence [9][10][11][12][13][14][15], the spot area of the target in the far field, the power density of the target in the far field [16][17][18][19][20], and the cumulative energy density [21,22], which gives the optimal intercept radius and the damage probability of the 10,000-watt highenergy laser system in different atmospheric environments. In [23], the authors proposed a systematic averaging method from the physical mechanism of the formation of the long-period averaged power intensity distribution, modelling the long-period averaged power intensity distribution under the effect of tracking and aiming errors and beam drift.…”

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

“…Firstly, adjusting the parameters of the LIBS system, i.e., focus distance and position. 12 Some studies investigated the optimal focus distance based on the LIBS spectral intensity, 13,14 but the LIBS spectral uctuation makes it difficult to determine the optimal focus distance. Thus, to correct for the defocusing caused by the variations in sample surface morphology, Motto-Ros et al adjusted the focus position by taking surface images of samples, 15 but the chromatic aberration between the imaging light source and the LIBS light source can lead to an inaccurate focus position.…”