Journal of Fusion Energy

, Volume 32, Issue 4, pp 422–425 | Cite as

Self-focusing of Gaussian Laser Beam Through Collisional Plasmas: Moment Theory Approach

Original Research
First Online:
Received:
Accepted:

Abstract

In the present paper, self-focusing of Gaussian laser beam through collisional plasma is studied by moment theory approach. Nonlinear differential equation for beam width parameter of laser beam has been set up and solved numerically to study the variation of beam width parameter with normalized distance of propagation. Effect of absorption coefficient and plasma density on the beam width parameter has been studied. It is observed from the analysis that increasing the value of absorption coefficient brings about reduction in extent of self-focusing on account of decrease in energy of beam, which is equivalent to weakening of nonlinearity effect. On the other hand, increase in plasma density results in a sharp decrease in focusing length due to increase in nonlinear part of dielectric constant.

Keywords

Self-focusing Collisional plasma Absorption coefficient Plasma density 
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Notes

Acknowledgments

The authors would like to thank Department of Science and Technology(DST), Government of India for the support of this work.

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  1. 1.Department of PhysicsNational Institute of Technology JalandharJalandharIndia

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