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Optical Properties of the e – e + Plasma Generated in the Focal Spot of a High‐Intensity Laser
Author(s) -
Blaschke D. B.,
Ilyine S. V.,
Panferov A.D.,
Röpke G.,
Smolyansky S. A.
Publication year - 2009
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200910061
Subject(s) - quasiparticle , molar absorptivity , physics , plasma , atomic physics , electric field , absorption (acoustics) , laser , electron , conductivity , polarization (electrochemistry) , attenuation coefficient , vacuum polarization , optics , intensity (physics) , condensed matter physics , nuclear physics , superconductivity , quantum electrodynamics , chemistry , quantum mechanics
We discuss the high frequency conductivity and absorption coefficient of an quasiparticle electron ‐ positron plasma (EPP) created from the vacuum in a strong nonstationary electric field (nonstationary Schwinger mechanism), e.g., in the focus spot of two counterpropagating laser beams. The consideration is based on a strong nonperturbative approach. It is shown that the basic contribution here is due to vacuum polarization effects. For subcritical linearly polarised fields, we obtain the general expression for the induced conductivity and the absorption coefficient, which is investigated in a wide range of frequencies from the optical to the γ‐ray region. Some experimental consequences of the high absorptivity of the quasiparticle EPP are discussed (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)