Table of Contents
Advances in Optical Technologies
Volume 2014, Article ID 472740, 7 pages
http://dx.doi.org/10.1155/2014/472740
Research Article

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

1Department of Engineering Physics, Indore Institute of Science and Technology, Indore 453331, India
2Department of Physics, M. B. Khalsa College, Indore 452002, India
3School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India

Received 12 November 2013; Revised 3 February 2014; Accepted 17 February 2014; Published 23 March 2014

Academic Editor: Partha P. Banerjee

Copyright © 2014 Sonu Sen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.