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axially non-uniform plasma

Laser and Particle Beams (1)

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Relativistic guidance of an intense laser beam through an axially non-uniform plasma channel
Arvinder Singh, Navpreet Singh
Journal:

Laser and Particle Beams / Volume 29 / Issue 3 / September 2011

Published online by Cambridge University Press:

17 June 2011, pp. 291-298
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The effect of relativistic nonlinearity on the guiding of a laser beam in a plasma channel formed by a short ionizing pulse is investigated. The plasma channel formed is axially non-uniform due to self defocusing of the prepulse. When a second delayed laser pulse propagates through the plasma channel formed by the prepulse, the competition between refraction and diffraction results into alternate convergence and divergence of the guided beam. Second-order nonlinear differential equations for the beam width parameter of the prepulse and guided pulse are derived by moment theory approach. The effect of the guided pulse intensities as well as the axial nonuniformity of the plasma channel on the propagation of the guided laser pulse has been investigated. Relativistic laser guidance up to several Rayleigh lengths is observed.