Space- and time-resolved optical diagnosis for the study of laser ablation plasma dynamics

Ursu, Cristian; Gurlui, Silviu; Focşa, Cristian; Popa, G.

doi:10.1016/j.nimb.2008.10.057

Cited by 39 publications

(28 citation statements)

References 15 publications

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“…These pictures reveal the formation of a single plasma structure, on the contrary of some previous studies showing a splitting of the plume in two components (fast and slow) [14,15,20,21]. The average axial velocity of the maximum emitting point derived from these images (4.4x10 3 m/s) is of the same order of magnitude as in the "slow" component of plasma plume recorded for the AsSe system [14] and is lower than the value derived from time-of-flight Langmuir probe experiments on the nanosecond ablation of gadolinium gallium garnet [15].…”

Section: Resultscontrasting

confidence: 99%

“…In order to get some insight on the internal energies of the species present in the plume, the excitation temperature can be calculated using the relative intensities of two or more spectral lines originating from the same ionization stage, based on the well-known Boltzmann plot method [20,21]. An example is given in Figure 6 for La II (spectroscopic constants from [24] have been used).…”

Section: Resultsmentioning

confidence: 99%

“…The experimental set-up employed for these measurements has been described previously [18][19][20][21]. A schematic view is presented in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

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Plasma diagnostics in pulsed laser deposition of GaLaS chalcogenides

Pompilian¹,

Gurlui²,

Němec³

et al. 2013

Applied Surface Science

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The aim of this work is to characterize the ejection plume obtained by laser ablation of GaLaS (GLS) samples in order to better understand the ablation phenomena for optimizing the pulsed laser deposition of chalcogenide thin films. The dynamics of the plasma between target and substrate was investigated through timeand space-resolved optical emission spectroscopy. High-resolution optical spectra have been recorded in the UV-VIS range using a 500-mm focal length monochromator and a fast gate ICCD camera. From the space-time evolution of the optical signals, the velocities of various species (including neutrals and ions) have been derived. Using the relative intensity method, the space-and time-evolution of the excitation temperature and electronic density have been determined. A complex behavior of the laser ablation plasma has been revealed.

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Section: Resultscontrasting

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Plasma diagnostics in pulsed laser deposition of GaLaS chalcogenides

Pompilian¹,

Gurlui²,

Němec³

et al. 2013

Applied Surface Science

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“…Also, a decrease of t max when increasing the laser pulse energy was evidenced in our previous work [55], as a consequence of the higher expansion velocity. For comparison, from the time-evolution of the optical maximum signals recorded by ICCD imaging, one can derive the center-of-mass velocities of the plasma structures [55,56,62]. In all our studies, we found values in the range of 10 4 m/s for the first (fast) structure and of 10 3 m/s for the second (slow) one, in agreement with experimental results given in the literature [80][81][82] and rough calculations performed in simple thermodynamic framework [58,59].…”

Section: Resultsmentioning

confidence: 99%

Experimental and Theoretical Studies on the Dynamics of Transient Plasmas Generated by Laser Ablation in Various Temporal Regimes

Nica¹,

Irimiciuc²,

Agop³

et al. 2017

Laser Ablation - From Fundamentals to Applications

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During the last decade, our groups have performed systematic experimental studies on the characterization of plasma plumes generated by laser ablation in various temporal regimes (ns, ps, fs) on materials ranging from simple metals (Al, Cu, Mn, Ni, In, W, …) to more complex compounds (ceramics, chalcogenide glasses, ferrites). Optical (fast imaging and space-and time-resolved emission spectroscopy) and electrical (mainly Langmuir probe) methods have been applied to experimentally investigate the dynamics of the plasma plume and its constituents. Influence of the target physical (thermodynamic and electrical) parameters on the plasma dynamics has been studied. A mathematical correlation between the local and global plasma parameters and the physical properties of the target was proposed for the first time. Peculiar behaviors like plume splitting or plasma oscillations have been evidenced for high laser fluence ablation in vacuum. Along with results from the literature, our findings provide convincing arguments for the existence of multiple double-layers in the laser ablation plasma plume, in a scenario including two-temperature electrons. New fractal-based theoretical approaches have been developed to qualitatively and quantitatively account for the observed phenomena. The space and time evolution of expansion velocity, particle number, current density and plasma temperature were theoretically investigated.

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“…In fact neutral species reach a maximum distance of only ≈ 1 mm from the target with the peak emission originating from a region lying at a distance of 0.5 mm from the target. Ursu et al [28] have shown how the expansion velocities of the ionised species in single laser produced plasmas are found to increase with the degree of ionisation. Not unexpectedly then, excited neutral species were found to be the slowest moving particles [28 - figure 4].…”

Section: Spatially Resolved Optical Emission Spectroscopy (Oes)mentioning

confidence: 99%

Emission characteristics and dynamics of the stagnation layer in colliding laser produced plasmas

Hough

McLoughlin

Harilal

et al. 2010

Journal of Applied Physics

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The expansion dynamics of ion and neutral species in laterally colliding laser produced aluminium plasmas have been investigated using time and space resolved optical emission spectroscopy and spectrally and angularly resolved fast imaging. The emission results highlight a difference in neutral atom and ion distributions in the stagnation layer where, at a time delay of 80 ns, the neutral atoms are localised in the vicinity of the target surface (< 1 mm from the target surface) while singly and doubly charged ions lie predominantly at larger distances, < 1.5 mm and < 2 mm respectively. The imaging results show that the ions were found to form a well defined, but compressed, stagnation layer at the collision front between the two seed plasmas at early times (∆t < 80 ns). On the other hand the excited neutrals were observed to form a V shaped emission feature at 2 the outer regions of the collision front with enhanced neutral emission in the less dense, cooler regions of the stagnation layer.

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Space- and time-resolved optical diagnosis for the study of laser ablation plasma dynamics

Cited by 39 publications

References 15 publications

Plasma diagnostics in pulsed laser deposition of GaLaS chalcogenides

Plasma diagnostics in pulsed laser deposition of GaLaS chalcogenides

Experimental and Theoretical Studies on the Dynamics of Transient Plasmas Generated by Laser Ablation in Various Temporal Regimes

Emission characteristics and dynamics of the stagnation layer in colliding laser produced plasmas

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