Electron number density measurements in magnesium laser produced plumes

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

doi:10.1016/s0169-4332(97)00731-9

Cited by 28 publications

(14 citation statements)

References 6 publications

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“…Nevertheless, in Ref. [25] electron number density values are presented in the order of 1 -8 Â 10 24 m À 3 , depending on position in the plume, for a laser irradiance of 3 Â 10 8 W/cm 2 [25]. This value of laser irradiance is just below the threshold for plasma formation in our model, so that our model predicts the electron density to be roughly zero for these conditions.…”

Section: Evaporated Plume Expansion and Plasma Formationmentioning

confidence: 72%

“…In Ref. [25], the effect of laser irradiance, in the range of 1.2-3 Â 10 8 W/cm 2 , on the electron density is reported, but for plume expansion in vacuum. Russo's group has also studied the effect of laser irradiance on the mass ablation rate of Cu [26], and they found a different power law, for a laser irradiance below or above 3 Â 10 8 W/cm 2 , attributed to plasma shielding.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of laser parameters on laser ablation and laser-induced plasma formation: A numerical modeling investigation

Bogaerts

Chen

2005

Spectrochimica Acta Part B: Atomic Spectroscopy

232

101

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Section: Evaporated Plume Expansion and Plasma Formationmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Effect of laser parameters on laser ablation and laser-induced plasma formation: A numerical modeling investigation

Bogaerts

Chen

2005

Spectrochimica Acta Part B: Atomic Spectroscopy

232

101

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“…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: 97%

“…The plume conditions are of great interest to scientists developing the techniques and have been investigated with a variety of diagnostics. [8][9][10][11][12][13] Recently we have implemented spectrally resolved optical Thomson scatter from such plasmas. 14 This is a powerful diagnostic tool [15][16][17][18] that has been applied to a variety of plasmas including tokamaks, 19,20 high temperature laser plasmas, 21 as well as rf discharge plasmas and arc discharges.…”

Section: Introductionmentioning

confidence: 99%

Optical Thomson scatter from a laser-ablated magnesium plume

Delserieys

Khattak

Lewis

et al. 2009

Journal of Applied Physics

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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.

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“…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

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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.

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Electron number density measurements in magnesium laser produced plumes

Cited by 28 publications

References 6 publications

Effect of laser parameters on laser ablation and laser-induced plasma formation: A numerical modeling investigation

Effect of laser parameters on laser ablation and laser-induced plasma formation: A numerical modeling investigation

Optical Thomson scatter from a laser-ablated magnesium plume

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

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