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{\large \bf Correlated quantum plasmas in strong laser fields}
\\[1ex]
M. Schlanges$^1$, Th. Bornath$^2$, P. Hilse$^1$, D. Kremp$^2$\\[0.5ex]
{\small
$^1$ Institut f\"ur Physik, Ernst-Moritz-Arndt-Universit\"at
Greifswald, Germany\\
$^2$ Fachbereich Physik, Universit\"at Rostock, Germany}\\[3ex]
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In the last years, laser--matter interaction has become a field of
increasing interest.
This is due to the impressive progress in laser technology which makes
it possible to create dense nonequilibrium plasmas by
high intensity femtosecond laser pulses. Of special importance for
modeling intense laser--matter interaction is to understand the
transfer processes of energy from the laser field to matter.\\
In this contribution, inverse bremsstrahlung absorption of dense
fully ionized plasmas in strong laser fields is investigated
in the framework of quantum kinetic theory. Especially, generalized
kinetic equations are used with non--Markovian and field dependent
collision integrals [1,2].
This allows to find rather general balance equations for
the energy and the current [3].
For high frequency laser fields
quantum statistical  expressions for the electrical current
density and the cycle--averaged electron--ion collision frequency
are derived. The expressions are valid for arbitrary field strength
assuming the nonrelativistic case.
Numerical results are presented to discuss these quantities as a function
of the applied laser field and for different plasma parameters. In particular,
the infuence of quantum effects and nonlinear phenomena such as higher
harmonics generation, and multiphoton processes in
electron--ion collisions are considered [3,4].
Finally, our results for the collision frequency are compared
with previous results obtained from classical theories.
\\[2ex]
[1] D. Kremp, Th. Bornath, M. Bonitz, M. Schlanges,\\
\indent Phys. Rev. {\bf E 60}, 4725 (1999).\\[0.5ex]
[2] M. Bonitz, Th. Bornath, D. Kremp, M. Schlanges, W.D. Kraeft,\\
\indent Contrib. Plasma Phys. {\bf 39}, 329 (1999).\\[0.5ex]
[3] Th. Bornath, M. Schlanges, P. Hilse, D. Kremp,\\
\indent Phys. Rev. {\bf E 64}, 026414 (2001).\\[0.5ex]
[4] H. Haberland, M. Bonitz, D. Kremp,\\
\indent Phys. Rev. {\bf E 64}, 026405 (2001).

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