Abstract
The time-space behavior of ions and electrons, whose density and temperature are typical of laser multiphoton-ionization experiments, is analyzed from the point of view of the fluid approximation, taking into account all nonlinear terms. The analytic methods of solution, already presented, are applied to describe the three-dimensional coupled motion of both ions and electrons, including also the energy exchange with the laser field and electron-ion collisions. It is shown that the plasma interacts with the laser field to produce a complex spectrum of odd harmonics of incident radiation whose features depend on experimental parameters, such as type and density of gas, laser pulse duration, frequency, and focusing conditions. The influence of collective electron motion on the phase-matching factor is also discussed. It is demonstrated that, under a suitable choice of involved parameters, a large number of harmonics is generated in a coherent process.
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