Time-resolved plasma spectroscopy of thin foils heated by a relativistic-intensity short-pulse laser

被引:17
作者
Audebert, P [1 ]
Shepherd, R
Fournier, KB
Peyrusse, O
Price, D
Lee, RW
Springer, P
Gauthier, JC
Klein, L
机构
[1] Univ Paris 06, Ecole Polytech, Lab Utilisat Lasers Intenses, CNRS,UMR 7605,CEA, F-91128 Palaiseau, France
[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
[3] CEA, F-91680 Bruyeres Le Chatel, France
[4] Howard Univ, Dept Phys & Astron, Washington, DC 20059 USA
来源
PHYSICAL REVIEW E | 2002年 / 66卷 / 06期
关键词
D O I
10.1103/PhysRevE.66.066412
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Time-resolved K-shell x-ray spectra are recorded from sub-100 nm aluminum foils irradiated by 150-fs laser pulses at relativistic intensities of Ilambda(2) = 2x10(18) W mum(2)/cm(2). The thermal penetration depth is greater than the foil thickness in these targets so that uniform heating takes place at constant density before hydrodynamic motion occurs. The high-contrast, high-intensity laser pulse, broad spectral band, and short time resolution utilized in this experiment permit a simplified interpretation of the dynamical evolution of the radiating matter. The observed spectrum displays two distinct phases. At early time, less than or equal to500 fs after detecting target emission, a broad quasicontinuous spectral feature with strong satellite emission from multiply excited levels is seen. At a later time, the He-like resonance line emission is dominant. The time-integrated data is in accord with previous studies with time resolution greater than 1 ps. The early time satellite emission is shown to be a signature of an initial large area, high density, low-temperature plasma created in the foil by fast electrons accelerated by the intense radiation field in the laser spot. We conclude that, because of this early time phenomenon and contrary to previous predictions, a short, high-intensity laser pulse incident on a thin foil does not create a uniform hot and dense plasma. The heating mechanism has been studied as a function of foil thickness, laser pulse length, and intensity. In addition, the spectra are found to be in broad agreement with a hydrodynamic expansion code postprocessed by a collisional-radiative model based on superconfiguration average rates and on the unresolved transition array formalism.
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页数:10
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