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Effect of relativistic self-focusing on plasma wave excitation by a hollow Gaussian beam

Published online by Cambridge University Press:  01 June 2011

RUCHIKA GUPTA ,
M. RAFAT  and
R. P. SHARMA
RUCHIKA GUPTA
Affiliation:
Department of Applied Sciences and Humanities, Jamia Millia Islamia, New Delhi 110025, India (ruchikaji81@gmail.com)
M. RAFAT
Affiliation:
Department of Applied Sciences and Humanities, Jamia Millia Islamia, New Delhi 110025, India (ruchikaji81@gmail.com)
R. P. SHARMA
Affiliation:
Centre for Energy Studies, Indian Institute of Technology, New Delhi 110016, India
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Abstract

A paraxial-like approach has been invoked to understand the nature of propagation of a hollow Gaussian beam (HGB) propagating in plasma under the influence of relativistic non-linearity. In this approach, the parameters are expanded in terms of the radial distance from the maximum of irradiance rather than that from the axis. This paper investigates the excitation of plasma wave in a hot collision less plasma by HGB. On account of the × force, a plasma wave at 2ω0 (here, ω0 is the pump laser frequency) is generated. The solution of the HGB has been obtained within the paraxial ray approximation. Filamentary structures of the laser beam are observed due to relativistic non-linearity.

Type
Papers
Information
Journal of Plasma Physics , Volume 77 , Issue 6 , December 2011 , pp. 777 - 784
Copyright
Copyright © Cambridge University Press 2011

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