Ashutosh Sharma
University of Lucknow
30 Papers
276 Citations
Ashutosh Sharma is an academic researcher from University of Lucknow. The author has contributed to research in topics: Paraxial approximation & Electron. The author has an hindex of 13, co-authored 30 publications. Previous affiliations of Ashutosh Sharma include Queen's University Belfast.
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Papers
Three regimes of intense laser beam propagation in plasmas
TL;DR: In this paper, for a given value of Ω < 1, three regimes have been obtained in the beam power-beam width plane, characterizing the nature of propagation as follows: (i) steady divergence (the beam keeps on diverging as it propagates in the plasma), (ii) oscillatory divergence (as the beam propagates, the beamwidth oscillates between the original beamwidth and a maximum value), and (iii) self-focusing (as a beam propagated in the plasmas the beam width oscillates to a minimum value).
63
Spatial evolution of a q-Gaussian laser beam in relativistic plasma
Ashutosh Sharma,Ioannis Kourakis +1 more
TL;DR: In this paper, a non-paraxial theory is employed to take into account nonlinearity via the relativistic decrease of the plasma frequency, and analytically and numerically the dynamics of a relativistically guided beam and its dependence on the q-parameter are studied.
52
Focusing of electromagnetic beams in collisional plasmas, with finite thermal conduction
TL;DR: In this paper, a self consistent solution of the electromagnetic wave equation, the energy balance equation, and Fourier's equation of heat conduction has been obtained in the paraxial approximation.
37
Self-focusing of electromagnetic beams in collisional plasmas with nonlinear absorption
TL;DR: In this paper, a complex eikonal has been employed, which does not need any approximation about the relative magnitudes of the real and imaginary parts of the dielectric constant or their dependence on the irradiance of the beam.
30
Focusing of an intense Gaussian laser beam in a radially inhomogeneous medium
TL;DR: In this article, the steady-state focusing-defocusing of a laser beam in a medium characterized by built-in radial inhomogeneity and nonlinearity of a saturating nature has been investigated in the paraxial approximation.
24