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Effect of electron-ion recombination on self-focusing/defocusing of a laser pulse in tunnel ionized plasmas

Published online by Cambridge University Press:  29 October 2013

Shikha Misra ,
S. K. Mishra ,
M. S. Sodha  and
V. K. Tripathi
Shikha Misra*
Affiliation:
Centre of Energy Studies, Indian Institute of Technology Delhi, New Delhi, India
S. K. Mishra
Affiliation:
Institute for Plasma Research, Gandhinagar, India
M. S. Sodha
Affiliation:
Centre of Energy Studies, Indian Institute of Technology Delhi, New Delhi, India
V. K. Tripathi
Affiliation:
Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
*
Address correspondence and reprint requests to: Shikha Misra, Centre of Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016, India. E-mail: [email protected]
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Abstract

A formalism for investigation of the propagation characteristics of various order short duration (pico second) Gaussian/dark hollow Gaussian laser pulse (DHGP) in a tunnel ionized plasma has been developed, which takes into account the electron-ion recombination. Utilizing the paraxial like approach, a nonlinear Schrödinger wave equation characterizing the beam spot size in space and time has been derived and solved numerically to investigate the transverse focusing (in space) and longitudinal compression (in time) of the laser pulse; the associated energy localization as the pulse advances in the plasma has also been analyzed. It is seen that in the absence of recombination the DHGP and Gaussian pulse undergo oscillatory and steady defocusing respectively. With the inclusion of recombination, the DHGP and Gaussian pulse both undergo periodic self-focusing for specific parameters. The DHGPs promise to be suitable for enhancement of energy transport inside the plasma.

Keywords

DHGPParaxial like approachRecombinationTunnel Ionization
Type
Research Article
Information
Laser and Particle Beams , Volume 32 , Issue 1 , March 2014 , pp. 21 - 31
Copyright
Copyright © Cambridge University Press 2013 

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