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Density effects in harmonic emission from intense laser interactions with overdense plasmas

Published online by Cambridge University Press:  01 June 2007

T. J. M. BOYD  and
R. ONDARZA-ROVIRA
T. J. M. BOYD
Affiliation:
Centre for Physics, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, Essex, UK ([email protected])
R. ONDARZA-ROVIRA
Affiliation:
Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, México 11801, D.F., Mexico ([email protected])
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Abstract

Although the harmonics generated when intense laser light interacts with solid targets are broadly understood in terms of their dependence on the incident intensity, less attention has been paid to the ways in which their behaviour depends on plasma density. In this paper the conversion efficiencies of the odd harmonics generated when light is incident normally on the target surface are shown to be strongly resonant in character. The number of resonances is governed by harmonic order and their behaviour with density is further complicated by Langmuir wave emission at the corresponding plasma resonant densities for successive harmonic orders. Only at densities well above these resonances does the emission decay monotonically with density. The density dependence predicted by theory is confirmed by particle-in-cell simulations.

Type
Papers
Information
Journal of Plasma Physics , Volume 73 , Issue 3 , June 2007 , pp. 307 - 313
Copyright
Copyright © Cambridge University Press 2006

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