Optical absorption and expansion of laser-produced plasmas

Dawson, J. ; Kaw, P. ; Green, B. (1969) Optical absorption and expansion of laser-produced plasmas Physics of Fluids, 12 (4). pp. 875-882. ISSN 0031-9171

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Official URL: http://pof.aip.org/resource/1/pfldas/v12/i4/p875_s...

Related URL: http://dx.doi.org/10.1063/1.1692570


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 5×10-2cm; 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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ID Code:25073
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