scholarly journals Nonlinear interaction of elliptical q-Gaussian laser beams with plasmas with axial density ramp: effect of ponderomotive force

2021 ◽  
Vol 53 (5) ◽  
Author(s):  
Naveen Gupta ◽  
Sandeep Kumar
Keyword(s):  
Nonlinear Interaction ◽  
Ponderomotive Force ◽  
Laser Beams ◽  
Axial Density

scholarly journals Optical Connecting of Fibers by Laser Beams Propagating from the Fibers Edges

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Sergey Nikolayevich Mensov ◽  
Yuri Victorovich Polushtaytsev
Keyword(s):  
Nonlinear Interaction ◽  
High Efficiency ◽  
Laser Beams ◽  
Light Beams

A possibility to connect nonprecise positioned fibers in photopolymerizable compositions is under discussion in this paper. The processes of optical synthesis of connective waveguiding structures forming in such mediums directly by the radiation leaving the edges of connecting fibers are investigated numerically and experimentally as well. It was shown that nonlinear interaction of the light beams allows to connect misaligned and transversally shifted fibers with high efficiency.

scholarly journals On the dynamics of ponderomotive filamentation of laser beams in a plasma

1988 ◽  
Vol 6 (2) ◽  
pp. 295-304 ◽  
Author(s):  
J. Limpouch ◽  
G. Lončar ◽  
I. G. Lebo ◽  
V. B. Rozanov
Keyword(s):  
Laser Beam ◽  
Large Amplitude ◽  
Ponderomotive Force ◽  
Laser Beams ◽  
Asymptotic Value ◽  
Transient Behaviour ◽  
Plasma Motion ◽  
Plasma Response ◽  
Temporary Growth ◽  
Stationary Approximation

The influence of ponderomotive force-induced plasma motion on filamentation is examined, using both linear and non-linear descriptions. Although the time asymptote of the process is identical to the stationary convective amplification of filaments, the dynamics of the plasma response may have a serious impact on the transient behaviour of filamentation. The plasma motion contains large amplitude oscillations of inhomogeneities in the laser beam with maxima that substantially exceed the asymptotic value and temporary growth of the very narrow filaments, which cannot be amplified in the stationary approximation.

scholarly journals Kinematical relations at nonlinear laser field: Free electron interactions

1990 ◽  
Vol 8 (3) ◽  
pp. 451-459 ◽  
Author(s):  
F. F. Körmendi
Keyword(s):  
Particle Acceleration ◽  
Charged Particle ◽  
Kinetic Parameters ◽  
Free Electron ◽  
Nonlinear Interaction ◽  
Laser Field ◽  
Frequency Conversion ◽  
Charged Particles ◽  
Laser Beams ◽  
Electron Interactions

Kinematical relations of nonlinear interaction of laser beams with free charged particles are analyzed. General expressions are found for the number of scattered photons as a function of the number of simultaneously absorbed and/or emitted photons and the kinetic parameters of the charged particle-photon system. The results are applied to the processes of particle acceleration by lasers, frequency conversion, solitonic propagation, and others.

Nonlinear interaction of electrostatic ion-cyclotron and drift waves in plasmas

1996 ◽  
Vol 56 (1) ◽  
pp. 187-191 ◽  
Author(s):  
O. A. Pokhotelov ◽  
L. Stenflo ◽  
P. K. Shukla
Keyword(s):  
Nonlinear Interaction ◽  
Ponderomotive Force ◽  
Modulational Instability ◽  
Low Frequency ◽  
Drift Waves ◽  
Nonlinear Coupling ◽  
Constant Amplitude ◽  
Ion Cyclotron Waves ◽  
Ion Cyclotron ◽  
Model Equations

Model equations describing the nonlinear coupling between electrostatic ion-cyclotron and drift waves are derived, taking into account the action of the low-frequency ponderomotive force associated with the ion-cyclotron waves. It is found that this interaction is governed by a pair of equations, which can be used for studying the modulational instability of a constant amplitude ion-cyclotron wave as well as the dynamics of nonlinearly coupled ion-cyclotron and drift waves.

On the formation of periodic and solitary whistler envelopes

1986 ◽  
Vol 36 (1) ◽  
pp. 25-35 ◽  
Author(s):  
G. Mann
Keyword(s):  
Nonlinear Interaction ◽  
Ponderomotive Force ◽  
Background Plasma ◽  
Conserved Quantities ◽  
Whistler Waves ◽  
Lagrange Formalism

The nonlinear interaction of whistler waves with the background plasma via the ponderomotive force gives rise to the formation of both periodic and solitary whistler envelopes. This is described in terms of the Lagrange formalism which allows us to define conserved quantities which determine, together with the parameters of the background plasma and the whistler frequency, the particular form of the envelope.

scholarly journals Self-focusing of asymmetric cosh-Gaussian laser beams propagating through collisionless magnetized plasma

2017 ◽  
Vol 35 (4) ◽  
pp. 670-676 ◽  
Author(s):  
B. D. Vhanmore ◽  
S. D. Patil ◽  
A. T. Valkunde ◽  
T. U. Urunkar ◽  
K. M. Gavade ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Ponderomotive Force ◽  
Beam Width ◽  
Magnetized Plasma ◽  
Laser Beams ◽  
Gaussian Beams ◽  
Equation Approach ◽  
Kutta Method ◽  
Runge Kutta Method ◽  
Self Focusing

AbstractIn this paper, self-focusing of asymmetric cosh-Gaussian laser beams in collisionless magnetized plasma has been studied. The non-linearity in dielectric constant considered herein is mainly due to the ponderomotive force. The non-linear coupled differential equations for the beam width parameters in transverse dimensions of the beam have been obtained by using WKB and paraxial approximations under parabolic equation approach. The numerical computation is completed by using fourth-order Runge–Kutta method. The effect of unlike decentered parameters in both transverse dimensions of the beam on self-focusing of cosh-Gaussian beams has been presented. Further, the effect of the static magnetic field and polarization modes of the laser has been explored.

scholarly journals Nonlinear Interaction of Elliptical q-Gaussian Laser Beams with Plasmas with Axial Density Ramp: Effect of Ponderomotive Force

2021 ◽  
Author(s):  
Naveen Gupta ◽  
Sandeep Kumar
Keyword(s):  
Differential Equations ◽  
Laser Beam ◽  
Nonlinear Partial Differential Equation ◽  
Beam Width ◽  
Laser Beams ◽  
Coordinate Space ◽  
Variational Theory ◽  
Plasma Parameters ◽  
The Fourier Transform ◽  
Axial Density

Abstract Theoretical investigation on optical self action effects of intense q-Gaussian laser beams interaction with collisionless plasmas with axial density ramp have been investigated in detail. Emphasis are put on investigating the dynamics of beam width and axial phase of the laser beam. Effect of the ellipticity of the cross section of the laser beam also has been incorporated. Using variational theory based on Lagrangian formulation nonlinear partial differential equation (P.D.E) governing the evolution of beam amplitude has been reduced to a set of coupled ordinary differential equations for the beam widths of the laser beam along the transverse directions. The evolution equation for the axial phase of the laser beam has been obtained by the Fourier transform of the amplitude structure of the laser beam from coordinate space to (kx; ky) space. The differential equations so obtained have been solved numerically to envision the effect of laser-plasma parameters on the propagation dynamics of the laser beam.

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