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Influence of laser beam intensity profile on propagation dynamics of laser-blow-off plasma plume

Published online by Cambridge University Press:  11 June 2010

Ajai Kumar ,
Sony George ,
R.K. Singh  and
V.P.N. Nampoori
Ajai Kumar*
Affiliation:
Institute for Plasma Research, Gandhinagar, India
Sony George
Affiliation:
ISP, Cochin University of Science and Tech., Cochin, India
R.K. Singh
Affiliation:
Institute for Plasma Research, Gandhinagar, India
V.P.N. Nampoori
Affiliation:
ISP, Cochin University of Science and Tech., Cochin, India
*
Address correspondence and reprint requests to: Ajai Kumar, Institute for Plasma Research, Bhat, Gandhinagar-382 428, India. E-mail: ajai@ipr.res.in, ajaiipr@yahoo.com
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Abstract

Effect of intensity profile of the ablating laser on the dynamics of laser-blow-off (LBO) plume has been studied by fast imaging technique. This work emphasizes the geometrical aspect of the LBO plume, which is an important parameter for various applications. Visualization of the expanding plume reveals that geometrical shape and directionality (divergence) of the plume are highly dependent on the laser intensity profile. Present results demonstrate that the Gaussian profile laser produces a well-collimated, low divergence plasma plume as compared to the plume formed by a top-hat profile laser. The sequence of film removal processes is invoked to explain the role of energy density profile of the ablating laser in LBO mechanism.

Keywords

Influence of laser beam intensity profileLaser-blow-off
Type
Research Article
Information
Laser and Particle Beams , Volume 28 , Issue 3 , September 2010 , pp. 387 - 392
Copyright
Copyright © Cambridge University Press 2010

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