Nonlinear inverse bremsstrahlung in soliddensity plasmas
Abstract
The laser intensity dependence of the inverse bremsstrahlung absorption coefficient in a strongly coupled plasma is investigated, where the electron quiver velocity (v_{0}=eE_{0}/mω_{0}) and excursion length (r_{0}=eE_{0}/mω^{2}_{0}) in the laser electric field are finite in comparison with the electron thermal velocity and shielding distance, respectively. In plasmas produced by an ultrashort pulse laser, the electron and ion temperatures are not in thermal equilibrium, and the electron temperature is higher than the ion temperature. Since ions are strongly coupled in such plasmas, the ionion correlation is described by the hypernettedchain equation. On the other hand, the electronion correlation is described by linearresponse theory. By using those correlation functions, the highfrequency conductivity and the laser absorption coefficients are evaluated. The results are applied to a recent experiment on reflectivity [Phys. Rev. Lett. 61, 2364 (1988)]. The analysis discloses the laser intensity dependence of the ultrashortpulselaser absorption rate.
 Publication:

Physical Review A
 Pub Date:
 May 1991
 DOI:
 10.1103/PhysRevA.43.5560
 Bibcode:
 1991PhRvA..43.5560K
 Keywords:

 Bremsstrahlung;
 Dense Plasmas;
 Inverse Scattering;
 Laser Plasmas;
 Strongly Coupled Plasmas;
 Nonlinear Equations;
 Ultrashort Pulsed Lasers;
 Plasma Physics;
 52.25.Dg;
 52.25.Rv;
 52.40.Nk;
 52.50.Jm;
 Plasma kinetic equations;
 Plasma production and heating by laser beams