Morphological and spectroscopic characterization of laser-ablated tungsten at various laser irradiances

Akram, Mahreen; Bashir, Shazia; Rafique, Muhammad; Hayat, Asma; Mahmood, Khaliq; Dawood, Asadullah; Bashir, M. F.

doi:10.1007/s00339-015-9052-0

Cited by 28 publications

(8 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…) (6) where ω is the electron impact width parameter which is a weak function of temperature [56]. To avoid line broadening error caused by self-absorption effect and interference of N II and O II lines, the ionic line of Al at 281.62 nm is selected to determine the electron density [57,58], which is shown in figure 9.…”

Section: Oes and Plasma Parametersmentioning

confidence: 99%

Experimental study on the dynamics and parameters of nanosecond laser-induced aluminum plasma

Yang

Zhou

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

In this paper, impulse measurement, spectral diagnostics, temporal evolution images and target ablation are employed to investigate the dynamic behaviors and parameters of Nd:YAG nanosecond laser-induced aluminum plasma at different pressures and laser fluences. The impulses and coupling coefficients generated by laser ablation increase firstly and then reduce with the decrease in pressure for the laser fluences of 17.22 J/cm2 and 20.94 J/cm2, but they only drop at 0.5 Torr for a laser fluence of 6.19 J/cm2. The fast exposure images captured by the high-speed camera and ICCD show that the plasma plumes present the separation at atmospheric pressure and expansion near vacuum, but last longer time at pressures of 150 Torr and 22 Torr. The duration and dynamic property of plasma are responsible for the impulse, as well as are mainly dependent on the characteristics of plasma parameters. Therefore, the electron density and electron temperature are obtained by Stark broadening method and Boltzmann plot, respectively. The change in the electron density is proportional to pressure and laser fluence. The variation trend of the crater depth and ablative mass with pressure is opposite to that of the electron density, which is ascribed to the plasma shielding effect caused by the inverse bremsstrahlung absorption mechanism. Besides, the electron temperature varies inversely with pressure in the detection range due to various recombination processes. This study provides an insight for clarifying the energy conversion mechanism and improving the laser propulsion performance.

show abstract

Section: Oes and Plasma Parametersmentioning

confidence: 99%

Experimental study on the dynamics and parameters of nanosecond laser-induced aluminum plasma

Yang

Zhou

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…These dissolved gases for high enough intensity can dominate the surface evaporation and cause explosive sputtering of the melt [26]. The mechanical stresses are explosively relaxed and can be accounted for the generation of cavities [27]. The formation of the cavities may also be attributed Fig.…”

Section: Sem Analysismentioning

confidence: 98%

Nanosecond pulsed laser ablation of Ge investigated by employing photoacoustic deflection technique and SEM analysis

Yaseen

Bashir

Shabbir

et al. 2016

Physica B: Condensed Matter

Self Cite

View full text Add to dashboard Cite

“…In this study, ∆λ instrument was 0.92 nm (determined by measuring the FWHM of the Hg lines emitted by a standard low pressure Hg lamp). The Stark-broadened full width at half maximum (FWHM (∆λ 1 / 2 )) can be related to the density (N e ) by the equation N e = (∆λ 1 / 2 /2ω)×10 16 cm −3 where ω is the electron impact width parameter, which is a weak function of temperature and can be estimated using the relation ω = 4.8767×10 −4 +1.16385×10 −8 T − 1.8473 × 10 −13 T 2 [12,13] .…”

Section: Plasma Temperature and Electron Densitymentioning

confidence: 99%

“…As is well known, tokamak fusion devices are operated in strong magnetic and vacuum conditions. Some investigations have been done using LIBS such as the effect of laser wavelength, laser irradiance on the spectroscopic characterization of laser induced tungsten plasma [12,13] , the effect of the variation of pressure, different ambient gas in the magnetic field condition using Al-Li alloy, cooper (Cu), LiF films [14−16] , etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of a Static Magnetic Field on Laser Induced Tungsten Plasma in Air

Liu

Sun

et al. 2016

Plasma Sci. Technol.

View full text Add to dashboard Cite

In this work, laser induced tungsten plasma has been investigated in the absence and presence of 0.6 T static transverse magnetic field at atmospheric pressure in air. The spectroscopic characterization of laser induced tungsten plasma was experimentally studied using space-resolved emission spectroscopy. The atomic emission lines of tungsten showed a significant enhancement in the presence of a magnetic field, while the ionic emission lines of tungsten presented little change. Temporal variation of the optical emission lines of tungsten indicated that the atomic emission time in the presence of a magnetic field was longer than that in the absence of a magnetic field, while no significant changes occurred for the ionic emission time. The spatial resolution of optical emission lines of tungsten demonstrated that the spatial distribution of atoms and ions were separated. The influence of a magnetic field on the spatial distribution of atoms was remarkable, whereas the spatial distribution of ions was little influenced by the magnetic field. The different behaviors between ions and atoms with and without magnetic field in air were related to the various atomic processes especially the electrons and ions recombination process during the plasma expansion and cooling process.

show abstract

Morphological and spectroscopic characterization of laser-ablated tungsten at various laser irradiances

Cited by 28 publications

References 35 publications

Experimental study on the dynamics and parameters of nanosecond laser-induced aluminum plasma

Experimental study on the dynamics and parameters of nanosecond laser-induced aluminum plasma

Nanosecond pulsed laser ablation of Ge investigated by employing photoacoustic deflection technique and SEM analysis

Influence of a Static Magnetic Field on Laser Induced Tungsten Plasma in Air

Contact Info

Product

Resources

About