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Physics of Plasmas / Volume 18 / Issue 12 / BRIEF COMMUNICATIONS

Phys. Plasmas 18, 124501 (2011); http://dx.doi.org/10.1063/1.3662098 (4 pages)

Enhanced thermal self-focusing of a Gaussian laser beam in a collisionless plasma

Devki Nandan Gupta1 and Hyyong Suk2

1Department of Physics and Astrophysics, University of Delhi, Delhi 110 007, India
2Advanced Photonics Research Institute (APRI) and Graduate Program of Photonics and Applied Physics, Gwangju Institute of Science and Technology, Gwangju 500 712, Korea

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(Received 20 June 2011; accepted 24 October 2011; published online 7 December 2011)

Theory given by Wang-Zhou [Phys. Plasmas 18, 043101 (2011)] for the thermal self-focusing of a Gaussian laser beam in a collisionless plasma is revisited by including the effect of a localized upward plasma-density ramp. As the equilibrium electron density is an increasing function of the distance of propagation of the laser beam, the diffraction length decreases rapidly as the beam penetrates deeper into the plasma and the diffraction effect becomes reduced; thus, the laser becomes more focused. A significant enhancement in laser thermal self-focusing in a collisionless plasma is consequently observed if a localized plasma density ramp is introduced.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

plasma density, plasma light propagation, plasma transport processes, self-focusing

PACS

  • 52.38.Dx

    Laser light absorption in plasmas (collisional, parametric, etc.)

  • 52.25.Fi

    Transport properties

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3662098

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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