Propagation of Laser Radiation in Multiple-Stage Ionized Matter
In the previous chapters, we focused our attention on a number of aspects of laser—matter interactions at extremely high intensities. We considered preformed, completely ionized plasmas where laser radiation propagation is governed by relativistic and ponderomotive charge-displacement nonlinearities and the electromagnetic field self-effect due to plasma wave excitation. Yet, laser-irradiated plasma nonlinearity is not limited to these mechanisms. Additionally, the description of powerful laser pulse propagation in matter must include a theory of the ionization of matter by laser radiation and plasma optical polarization, i.e., the deformation of electron shells resulting in the emergence of oscillating dipole moments of multiply charged ions. Naturally, both of these phenomena contribute to the medium’s dielectric response modification by propagating laser radiation.
KeywordsLaser Pulse Laser Radiation Dipole Moment Focal Spot Ionization Stage
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