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Calculations of the absorption of laser radiation by an inhomogeneous overdense plasma have been carried out. Such a plasma is produced when a high-powered laser irradiates a solid particle. Nearly complete absorption is found as long as 2R is greater than c⊥ here, R is the scale length for density falloff, c is the velocity of light, and ⊥ is the electron-ion collision time for a plasma frequency equal to the incident laser frequency. For hydrogen this gives complete absorption up to temperatures of 5 keV if R is greater than 5 × 10−2 cm; higher Z materials absorb better. The expansion of a laser-produced plasma was also investigated. In the case of a plasma produced from a thin metallic film, it is found that the expansion preferentially takes place normal to the film which is in agreement with observation.
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John M. Dawson
P. K. Kaw
B. Green
The Physics of Fluids
Princeton University
Princeton Plasma Physics Laboratory
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Dawson et al. (Tue,) studied this question.
www.synapsesocial.com/papers/6a157bf037103a43379fce7e — DOI: https://doi.org/10.1063/1.1692570