Three-dimensional number density mapping in the plume of a low-temperature laser-ablated magnesium plasma

Martin, G. W.; Doyle, L.A.; Al‐Khateeb, A.; Weaver, I.; Riley, David; Lamb, Martin; Morrow, Thomas; Lewis, Ciaran

doi:10.1016/s0169-4332(97)00730-7

Cited by 33 publications

(20 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The densities are broadly consistent with previous interferometry and laser induced fluorescence measurements. 13,30 We can see evidence of a rise and subsequent fall in density as the plasma plume takes time to arrive at a particular point in space, with velocity ϳ10 6 cm s −1 . We have fitted power laws to the subsequent decay of the electron density with time and find that the density falls off more rapidly than the n e ϰ t −3 expected from a simple three-dimensional ͑3D͒ adiabatic expansion of an initially thin, uniform 1 mm 2 slab of plasma.…”

Section: Methodsmentioning

confidence: 98%

“…Multicomponent plumes have been observed in the past, for example, using LIF. 30 One possible interpretation is that the faster plume comes from a plasma created and heated during the beam interaction and that the slower moving component is a result of evaporation from the melt pool on the surface of the solid target. In the axial direction, we only have four positions so we cannot sensibly attempt to fit a double Gaussian spatial profile; a slow component may not even reach the first spatial position at 2 mm until late in time.…”

Section: B Comparison With Plume Expansion Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Optical Thomson scatter from a laser-ablated magnesium plume

Delserieys

Khattak

Lewis

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

We have carried out an optical Thomson scatter study of a KrF laser-ablated Mg plume. The evolution of the electron temperature and density at distances 2 -5 mm from the target surface has been studied. We have observed that the electron density falls more rapidly than the atomic density and believe that this is a result of rapid dielectronic recombination. A comparison of the electron density profile and evolution with simple hydrodynamic modeling indicates that there is a strong absorption of the laser in the plasma vapor above the target, probably due to photoionization. We also conclude that an isothermal model of expansion better fits the data than an isentropic expansion model. Finally, we compared data obtained from Thomson scatter with those obtained by emission spectroscopy under similar conditions. The two sets of data have differences but are broadly consistent.

show abstract

Section: Methodsmentioning

confidence: 98%

Section: B Comparison With Plume Expansion Modelsmentioning

confidence: 99%

Optical Thomson scatter from a laser-ablated magnesium plume

Delserieys

Khattak

Lewis

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…Around the same time, the LIF imaging technique using a sheet-shaped laser beam was introduced to observe the cross-sectional structure of the irradiated portion of a plume [32][33][34][35]. Nakata et al compared the expansion characteristics of ground state and highly excited atoms using fluorescence and emission imaging spectroscopy [36].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Ablation plume structure and dynamics in ambient gas observed by laser-induced fluorescence imaging spectroscopy

Miyabe

Oba

Iimura

et al. 2015

Spectrochimica Acta Part B: Atomic Spectroscopy

View full text Add to dashboard Cite

“…Various techniques are used to measure the electron densities and temperature in transient plasma plumes. They include LP, 10,12 Stark broadening, 13 beam deflection, 14 interferometry, 15 laser induced fluorescence, 16 and Thomson scattering. 17 Among these, LP arrangement is the simplest technique for the measurement of electron temperature and density.…”

Section: Introductionmentioning

confidence: 99%

Parametric study of expanding plasma plume formed by laser-blow-off of thin film using triple Langmuir probe

Kumar¹,

Singh²,

Thomas³

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

The triple probe technique has been used to study the parameters of flowing plasma plume formed by laser-blow-off (LBO) of a multicomponent LiF–C target. The advantages of triple Langmuir probe over the single probe have been discussed with regard to the present study. Our results show that triple probe is better suited for parametric measurements close to the target. The spatiotemporal evolutions of electron density and temperature were measured in different ambient environments and for various laser fluences. The angular distribution of electron density and temperature was also measured. It was found that the presence of ambient gas drastically affects the electron density and temperature of the LBO plume. Large enhancement in ne and Te at intermediate pressures (10−2 Torr) is expected due to increase in collisional processes. On the other hand, laser fluence does not affect the observed ne and Te significantly. In vacuum, a new phenomenon, i.e., an oscillation in the trailing portion of the plasma plume at a closer distance from the target, is also reported.

show abstract

Three-dimensional number density mapping in the plume of a low-temperature laser-ablated magnesium plasma

Cited by 33 publications

References 8 publications

Optical Thomson scatter from a laser-ablated magnesium plume

Optical Thomson scatter from a laser-ablated magnesium plume

Ablation plume structure and dynamics in ambient gas observed by laser-induced fluorescence imaging spectroscopy

Parametric study of expanding plasma plume formed by laser-blow-off of thin film using triple Langmuir probe

Contact Info

Product

Resources

About