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Title: Onset of diffuse reflectivity and fast electron flux inhibition in 528-nm-laser{endash}solid interactions at ultrahigh intensity

Using a high-power femtosecond frequency-doubled Nd:glass laser system with a contrast ratio of 10{sup 12}, the interaction between light and matter up to intensities of 10{sup 19} Wthinspcm{sup {minus}2}has been investigated. The absorption of the laser light in solid aluminum is almost independent of the polarization, peaks at about 25{degree}, and reaches values of almost 45{percent}. Assuming an exponential electron distribution, a temperature of 420 keV at 4{times}10{sup 18} Wthinspcm{sup {minus}2}was measured. These experiments and the detection of the hard-x-ray radiation (60 keV{endash}1 MeV) implied a conversion efficiency of 10{sup {minus}4}{endash}10{sup {minus}3} into suprathermal electrons. A second low-energy electron distribution either with trajectories mainly parallel to the target surface or with a reduced penetration depth due to flux inhibition was also inferred from K{alpha} line radiation measurements. {copyright} {ital 1997} {ital The American Physical Society}
Authors:
; ;  [1] ; ; ; ; ;  [2] ; ;  [3]
  1. Institut fuer Optik und Quantenelektronik, Friedrich-Schiller-Universitaet, Max-Wien-Platz 1, D-07743 Jena (Germany)
  2. Max-Planck-Arbeitsgruppe Roentgenoptik an der Friedrich-Schiller-Universitaet, Max-Wien-Platz 1, D-07743 Jena (Germany)
  3. Commissariat a lEnergie Atomique, Centre dEtudes de Limeil-Valenton, 94195 Villeneuve-Saint-Georges Cedex (France)
Publication Date:
OSTI Identifier:
632552
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; Journal Volume: 56; Journal Issue: 4; Other Information: PBD: Oct 1997
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; LASER-PRODUCED PLASMA; ALUMINIUM; LIGHT SCATTERING; MATTER; ABSORPTION; POLARIZATION; ELECTRONS; DISTRIBUTION; PENETRATION DEPTH; INHIBITION; RADIATIONS; INERTIAL CONFINEMENT; ELECTRON DENSITY; PLASMA SIMULATION