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Title: Second harmonic generation of q-Gaussian laser beam in preformed collisional plasma channel with nonlinear absorption

This paper presents a scheme for second harmonic generation of an intense q-Gaussian laser beam in a preformed parabolic plasma channel, where collisional nonlinearity is operative with nonlinear absorption. Due to nonuniform irradiance of intensity along the wavefront of the laser beam, nonuniform Ohmic heating of plasma electrons takes place. Due to this nonuniform heating of plasma, the laser beam gets self-focused and produces strong density gradients in the transverse direction. The generated density gradients excite an electron plasma wave at pump frequency that interacts with the pump beam to produce its second harmonics. The formulation is based on a numerical solution of the nonlinear Schrodinger wave equation in WKB approximation followed by moment theory approach. A second order nonlinear differential equation governing the propagation dynamics of the laser beam with distance of propagation has been obtained and is solved numerically by Runge Kutta fourth order technique. The effect of nonlinear absorption on self-focusing of the laser beam and conversion efficiency of its second harmonics has been investigated.
Authors:
;  [1] ;  [2]
  1. Department of Physics, National Institute of Technology Jalandhar (India)
  2. Guru Nanak Dev University College, Kapurthala, Punjab (India)
Publication Date:
OSTI Identifier:
22489862
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION; COLLISIONAL PLASMA; ELECTRON PLASMA WAVES; FOCUSING; HARMONIC GENERATION; HARMONICS; JOULE HEATING; LASER RADIATION; NONLINEAR PROBLEMS; PHOTON BEAMS; RADIANT FLUX DENSITY; RUNGE-KUTTA METHOD; SCHROEDINGER EQUATION; WKB APPROXIMATION