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|Title:||Self-focusing of an ultra-intense short-pulse laser beam in a tunnel-ionized plasma|
|Authors:||Gupta, G P|
|Abstract:||Tunnel-ionized plasma evolve on a time scale shorter than the duration of an ultra-intense short-pulse laser beam propagating through matter. Self-focusing of a linearly polarized laser beam with a parabolic intensity distribution in a tunnel-ionized plasma produced during its propagation through a gas is studied under the paraxial ray approximation. The Laplacian term of the electric field in the electromagnetic wave equation has been evaluated using two approaches, one leading to the more accurate expression for the beam-width parameter f and the other leading to the less accurate expression for f. Analyzing these expressions along with that reported in the literature for a Gaussian laser beam it is observed that the expressions obtained in this paper predict the increasing axial intensity with the distance of propagation (self focusing) in contrast to the result (self-defocusing) predicted from the earlier reported expression.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.38(01) [January 2000]|
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