One-dimensional Model for Nonlinear Reflection of Laser Radiation by an Inhomogeneous Plasma Layer

Abstract

One-dimensional model for nonlinear reflection of laser radiation by an inhomogeneous plasma layer.

Computation of Ion-acoustic Wave Excitation and its Anomalous Effects for Double-sided Laser-plasma Interaction

“…The purpose of the present report is to extend the previous study [2] to the situation where the inhomogeneous plasma layer ( -xo < x < x,) is exposed to radiation by two laser beams incident from opposite directions. We then have a situation, that is symmetric with regard to the center of the plasma slab, provided the two laser beams have the same power.…”

“…Anomalous effects, such as nonlinear reflection due to nonlinear interaction of radiation with excitations in the plasma medium may play an essential role for the problem of plasma heating by lasers [l, 21. In a recent report [2] effects of ion-acoustic waves, excited by laser radiation, on the nonlinear reflection and absorption were studied in a one-dimensional case considering an inhomogeneous plasma layer. For laser powers exceeding a certain threshold value an appreciable nonlinear reflection was found even M hen the plasma layer was linearly transparent.…”

Stimulated Brillouin back-scattering at relativistic laser power

“…One of the major reasons for this is that the characteristics of real laser beams and plasma might be too far from the idealized theoretical assumptions. One of the main challenges in current research is a theoretical explanation of the relatively low level of reflectivity observed in largescale laser fusion experiments [22] and in well-controlled interaction experiments with preformed plasma [13][14][15][16][17][18][19][20][21][22][23][24]. Simple estimates based on linear gain theory predict a SBS reflectivity much higher than that observed in these experiments.…”

“…In solid target experiments, energy reflectivities attributed to SBS have varied from 0 to 50% [1][2][3][4][5]. Little agreement between theory and experiments has been reported so far in spite of intensive studies of SBS during the last two decades in both fields [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. One of the major reasons for this is that the characteristics of real laser beams and plasma might be too far from the idealized theoretical assumptions.…”

Particle-In-Cell observations of Brillouin scattering for laser interacting with magnetized overdense plasma

“…The occurrence of these Raman and Brillouin instabilities were directly shown for pulsed electromagnetic solitonic structures propagating in plasmas by Saxena et al [19] and Sundar et al [20] respectively with the help of fluid simulations. The application of Brillouin scattering process in the context of laser fusion has been highlighted in many works [21][22][23][24]. For magnetized plasma theoretical studies have been carried out for the parametric instability by many authors.…”