Morphology and characteristics of laser-induced aluminum plasma in argon and in air: A comparative study

Bai, Xueshi; Cao, Fan; Motto-Ros, Vincent; Ma, Qianli; Chen, Yanping; Yu, Jianhua

doi:10.1016/j.sab.2015.09.023

Cited by 32 publications

(7 citation statements)

References 17 publications

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“…The shockwave usually expands at a higher speed, which is higher than the speed of a sound wave in air. In LIBS with the spatial confinement, different from the free propagated shockwave without the spatial confinement [37][38][39][40], when the shockwave arrives at the surface of the confinement cavity, the shockwave will be reflected by the inside surface of the confinement cavity. The shockwave continues to propagate back to the plasma plume, and subsequently interacts with the plasma plume.…”

Section: Resultsmentioning

confidence: 99%

“…The spatial confinement effect is devoted to improving the signal intensity in LIBS measurement. Yeates and Kennedy reported visible emission spectroscopy [28], visible intensified gated imaging and electrostatic probe analysis of laser plasma plumes generated within aluminum rectangular cavities of a fixed depth 6 mm and varying width (2.0, 1.5, and 1.0 mm), for comparison with the freely expanding plasma plumes generated from planar targets [37][38][39][40]. Fu et al investigated the synchronous behaviors of both a laserinduced plasma and shockwave on a flat surface and in a rectangular groove cavity [36].…”

Section: Introductionmentioning

confidence: 99%

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Effect of cylindrical cavity height on laser-induced breakdown spectroscopy with spatial confinement

Shao

Wang

Guo

et al. 2017

Plasma Sci. Technol.

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In this paper, we present a study on the spatial confinement effect of laser-induced plasma with a cylindrical cavity in laser-induced breakdown spectroscopy (LIBS). The emission intensity with the spatial confinement is dependent on the height of the confinement cavity. It is found that, by selecting the appropriate height of cylindrical cavity, the signal enhancement can be significantly increased. At the cylindrical cavity (diameter=2 mm) with a height of 6 mm, the enhancement ratio has the maximum value (approximately 8.3), and the value of the relative standard deviation (RSD) (7.6%) is at a minimum, the repeatability of LIBS signal is best. The results indicate that the height of confinement cavity is very important for LIBS technique to reduce the limit of detection and improve the precision.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of cylindrical cavity height on laser-induced breakdown spectroscopy with spatial confinement

Shao

Wang

Guo

et al. 2017

Plasma Sci. Technol.

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“…The nature of ambient gas play an important role in the formation and evolution of plasma. Hitherto a large number of literatures have extensively discussed the effects of ambient gas species on the laser ablation and subsequent plasma evolution from theoretical [31,49] and experimental [50,51] perspectives. In this section, we will give our simulation results for this effect.…”

Section: Effect Of Ambient Gas Species On the Plasma Characteristicsmentioning

confidence: 99%

Two-dimensional axisymmetric radiation hydrodynamics model of moderate-intensity nanosecond laser-produced plasmas

Qin¹,

Shen²,

Su³

et al. 2022

J. Phys. D: Appl. Phys.

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A two-dimensional axisymmetric radiation hydrodynamics model has been proposed to simulate nanosecond laser ablation of a solid target in ambient argon, air and helium at different pressures. The heat conduction equation used to simulate the conduction of laser deposition energy in the target and gas dynamic equations to describe the interaction between laser and vapor plasma and the evolution of plasma are coupled through the Knudsen layer relations at the target-vapor interface. A collisional-radiative model including 12 atomic processes is used to calculate the population of atomic energy levels and fractional ion abundance. The internal energy and pressure of the plasma are expressed by the equations of state based on a real gas approximation, which divides the internal energy into the ionization energy, thermal energy, and excitation energy of atoms and ions. The distributions of the temperature, pressure, density and velocity of the target and plasma are calculated by using this model, and the results are analyzed. Experimental results of multiple diagnostic tools including fast photography, shadowgraphy images, spatio-temporally resolved optical emission spectroscopy and laser interferometry, are used to benchmark the simulation results, and satisfactory consistencies are obtained. The model provides a numerical tool to interpret experimental data of a moderate-intensity nanosecond laser ablated solid target when the temperature of the target surface does not reach the critical value.

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“…Wei Zhang et al studied the process of LSCW induced by the irradiation between aluminum alloy and millisecond pulse laser [23]. Xueshi Bai et al studied the morphology and the internal structure of the plasma induced by nanosecond pulse laser on aluminum target [24,25]. It is pointed out that the plasma production mechanism of millisecond (ms) laser is different from nanosecond (ns) laser, which is thermal conduction and optical breakdown, separately.…”

Section: Introductionmentioning

confidence: 99%

The acceleration mechanism of shock wave induced by millisecond-nanosecond combined-pulse laser on silicon

Zhang

Zhou

et al. 2021

Plasma Sci. Technol.

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The velocity variation law of shock wave induced by millisecond-nanosecond combined-pulse laser has been investigated experimentally. The pulse delay and laser energy are important experimental variables. The method of laser shadowgraphy is used in the experiment. Experimental results show that when the pulse delay is 2.4 ms, the ms and ns laser energy density is 301 J cm−2 and 12 J cm−2, respectively, the velocity of shock wave is 1.09 times faster than that induced by single ns pulse laser. It is inferred that the shock wave propagates in the plasma is faster than that in air. When the ms and ns laser energy density is 414.58 and 24 J cm−2, the velocity of shock wave shows rising trend with pulse delay in a range of 1.4 ms > Δt > 0.8 ms. It is indicated that with the increase of ns laser energy, the laser energy absorbed by laser-supported absorption wave increases. The mechanism of inverse bremsstrahlung absorption acts with target surface absorption simultaneously during the ns laser irradiation. Thus, the phenomenon of the double shock wave is induced. The numerical results of the phenomenon were accordance with experiment. The results of this research can provide a reference for the field of laser propulsion.

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Morphology and characteristics of laser-induced aluminum plasma in argon and in air: A comparative study

Cited by 32 publications

References 17 publications

Effect of cylindrical cavity height on laser-induced breakdown spectroscopy with spatial confinement

Effect of cylindrical cavity height on laser-induced breakdown spectroscopy with spatial confinement

Two-dimensional axisymmetric radiation hydrodynamics model of moderate-intensity nanosecond laser-produced plasmas

The acceleration mechanism of shock wave induced by millisecond-nanosecond combined-pulse laser on silicon

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