Hot electron generation in laser cluster plasma

Smirnov, M. B.; Крайнов, В. П.

doi:10.1063/1.1536975

Cited by 17 publications

(11 citation statements)

References 15 publications

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“…Energy is absorbed resonantly when the normalized effective oscillation frequency becomes unity (Kundu & Bauer, 2006b). Apart from resonance absorption, various other energy absorption mechanism like vacuum heating (Brunel, 1987), collision-less resonance absorption (Kostyukov & Rax, 2003) and scattering at the cluster potential (Smirnov & Krainov, 2003) have been also suggested. Although various energy mechanisms have been proposed, resonance absorption is still believed to be the main method for energy absorption.…”

Section: Introductionmentioning

confidence: 99%

Effect of laser pulse time profile on its absorption by argon clusters

2011

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The interaction of medium sized Argon clusters (30 Å) with high-intensity femtosecond laser pulses (806 nm, 8 × 10 16 W/ cm 2 ) of durations ranging from 10 fs to 120 fs have been studied using a three-dimensional relativistic time dependent molecular dynamic approach. The dynamics of cluster expansion is explained in terms of temporal evolution of electron population in the cluster and snapshots of particle positions at various times. The effects of inter-cluster distance on ionization dynamics are presented. It is observed that the collisional ionization increases with decreasing inter-cluster distance. The effect of pulse duration on laser energy absorption is also studied. For a laser pulse of gaussian time profile, there exists an optimum pulse duration for maximum absorption. No such optimum exists for a nearly flat top (super-gaussian) laser pulse. Results indicate the existence of resonance absorption inside the cluster. It is also observed that the high energy component of ion emission from cluster is anisotropic, showing a preferential direction of emission along laser polarization while the low energy ions emerge almost isotropically.

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Section: Introductionmentioning

confidence: 99%

Effect of laser pulse time profile on its absorption by argon clusters

2011

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“…Vacuum heating, originally developed by Brunel for planar geometry, has been extended for three-dimensional ͑3D͒ objects such as clusters by Greschik et al 4 They studied nonresonant energy absorption by outer electron ionization of clusters in the short laser pulse regime ͑few laser cycles͒. Collisionless resonance absorption 15 and scattering at the cluster potential 16 have also been considered, among others.…”

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confidence: 98%

Nonlinear energy absorption of rare gas clusters in intense laser field

Davis¹,

Petrov²,

Velikovich³

2007

Physics of Plasmas

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The energy absorption of rare gas clusters irradiated by an intense ultrashort laser pulse is studied numerically. Various mechanisms of collisionless energy absorption were evaluated and discussed. The molecular dynamics simulations results suggest that both the linear and nonlinear resonance absorption mechanisms are marginally relevant. A capacitor model is considered that links the energy absorption to outer electron ionization and volume distribution of charges, rather than oscillation of electrons and transition through a resonance. It predicts correctly the absolute absorbed energy, as well as the dependence of the absorbed energy versus number of atoms per cluster.

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“…Simple estimates show that collective inverse bremsstrahlung or, equivalently, coherent collisional absorption makes the leading contribution. It should be mentioned that the idea of collective scattering dates back to 1997 and was recently used to explain hot electron generation from clusters [8].…”

Section: Discussionmentioning

confidence: 99%