A filter or oscillator by a simple density hump for an intense laser propagating in a preformed plasma channel

2019 ◽  
Vol 26 (4) ◽  
pp. 043106 ◽  
Author(s):  
Lei Zhang ◽  
Rong-An Tang ◽  
Xue-Ren Hong ◽  
Ji-Ming Gao ◽  
Li-Ru Yin ◽  
...  
Keyword(s):  
Plasma Channel ◽  
Intense Laser ◽  
Preformed Plasma

Interaction of ultraintense laser pulses with an underdense, preformed plasma channel

2000 ◽  
Vol 28 (4) ◽  
pp. 1078-1083 ◽  
Author(s):  
V. Malka ◽  
J. Faure ◽  
J.R. Marques ◽  
F. Amiranoff ◽  
C. Courtois ◽  
...  
Keyword(s):  
Plasma Channel ◽  
Laser Pulses ◽  
Preformed Plasma

The effect of plasma channel on the self-distortion of laser pulse propagating through the collisionless plasma channel

2014 ◽  
Vol 23 (03) ◽  
pp. 1450027
Author(s):  
Navpreet Singh ◽  
Arvinder Singh
Keyword(s):  
Laser Pulse ◽  
Differential Equations ◽  
Density Profile ◽  
Plasma Channel ◽  
Collisionless Plasma ◽  
Beam Width ◽  
Low Intensity ◽  
Pulse Distortion ◽  
Set Up ◽  
Preformed Plasma

This paper presents an investigation of the laser pulse distortion/breakup and the effect of the plasma channel on the laser propagation through the collisionless plasma. Moment theory has been used to derive differential equations of the beam width parameter of the laser propagating through uniform homogenous plasma and preformed plasma channel having parabolic density profile. Differential equations have been set up and solved numerically by using Runge Kutta method. From analysis, it is observed that the low intensity front and rear parts of the laser pulse get defocused/diffracted while the high intensity central portion of the laser pulse gets self-guided during the propagation through uniform homogenous plasma. As a result of this, laser pulse gets distorted. This distortion of the laser pulse has not been observed when the laser beam is propagated through the plasma channel having parabolic density profile. The laser pulse is guided as a whole, even the low intensity front and rear parts of the laser pulse are also guided. Therefore, it is predicted that plasma channel plays a significant role to prevent the distortion/beam breakup of the laser.

scholarly journals Role of Density Profiles for the Nonlinear Propagation of Intense Laser Beam through Plasma Channel

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Sonu Sen ◽  
Meenu Asthana Varshney ◽  
Dinesh Varshney
Keyword(s):  
Laser Beam ◽  
Dielectric Function ◽  
Laser Plasma ◽  
Plasma Channel ◽  
Intense Laser ◽  
Nonlinear Propagation ◽  
Density Profiles ◽  
Laser Plasma Interaction ◽  
Self Focusing

In this work role of density profiles for the nonlinear propagation of intense laser beam through plasma channel is analyzed. By employing the expression for the dielectric function of different density profile plasma, a differential equation for beamwidth parameter is derived under WKB and paraxial approximation. The laser induces modifications of the dielectric function through nonlinearities. It is found that density profiles play vital role in laser-plasma interaction studies. To have numerical appreciation of the results the propagation equation for plasma is solved using the fourth order Runge-Kutta method for the initial plane wave front of the beam, using boundary conditions. The spot size of the laser beam decreases as the beam penetrates into the plasma and significantly adds self-focusing in plasma. This causes the laser beam to become more focused by reduction of diffraction effect, which is an important phenomenon in inertial confinement fusion and also for the understanding of self-focusing of laser pulses. Numerical computations are presented and discussed in the form of graphs for typical parameters of laser-plasma interaction.

Distribution regimes of intense laser beam in a self-consistent plasma channel

2014 ◽  
Vol 116 (4) ◽  
pp. 811-819
Author(s):  
Sonu Sen ◽  
Meenu Asthana Varshney ◽  
Dinesh Varshney
Keyword(s):  
Laser Beam ◽  
Plasma Channel ◽  
Intense Laser ◽  
Intense Laser Beam ◽  
Self Consistent

Optical Guiding of Intense Hermite-Gaussian Laser Beam in Preformed Plasma Channel and Second Harmonic Generation

2021 ◽  
Author(s):  
Jyoti Wadhwa ◽  
Arvinder Singh
Keyword(s):  
Differential Equations ◽  
Second Harmonic Generation ◽  
Laser Beam ◽  
Harmonic Generation ◽  
Plasma Channel ◽  
Second Harmonic ◽  
Electron Plasma ◽  
Gaussian Laser Beam ◽  
Electron Plasma Wave ◽  
Preformed Plasma

Abstract This work presents the scheme of optical channeling of the intense Hermite Gaussian laser beam and second-harmonic generation in plasma having the preformed plasma channel, where relativistic nonlinearity is operative. Excitation of the electron plasma wave at the incident beam frequency leads its coupling with the latter produces the second harmonics of the beam. For the formulation of differential equations for the beam waists of the Hermite Gaussian laser beam propagating through the channel, the method of moments has been used. The solutions of the coupled differential equations are found using Runge Kutta fourth-order numerical method. Perturbation theory has been applied to find the equation governing the excitation of electron plasma wave and hence the source term for the second-harmonic yield. It has been observed that the preformed plasma channel helps to optically guide the laser beam and enhances the efficiency of second-harmonic generation of various modes of the Hermite Gaussian laser beam in plasma.

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