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Analytical and numerical investigation of diffraction effects on the nonlinear propagation of ultra-intense few-cycle optical pulses in plasmas

Published online by Cambridge University Press:  01 October 2009

HARISH MALAV ,
K. P. MAHESHWARI ,
R. S. MEGHWAL ,
Y. CHOYAL  and
RAKESH SHARMA
HARISH MALAV
Affiliation:
DST-Project, Vardhaman Mahaveer Open University (VMOU), Kota 324010, Rajasthan, India (malavh@yahoo.co.in; k_p_maheshwari@rediffmail.com; rsharma_vmou@yahoo.co.in)
K. P. MAHESHWARI
Affiliation:
DST-Project, Vardhaman Mahaveer Open University (VMOU), Kota 324010, Rajasthan, India (malavh@yahoo.co.in; k_p_maheshwari@rediffmail.com; rsharma_vmou@yahoo.co.in)
R. S. MEGHWAL
Affiliation:
Department of Physics, Government College, Kota 324001, Rajasthan, India (rsmeghwal1970@gmail.com)
Y. CHOYAL
Affiliation:
School of Physics, Devi Ahilya Vishwavidhyalaya, Indore 452017, Madhya Pradesh, India (ychoyal@yahoo.com)
RAKESH SHARMA
Affiliation:
DST-Project, Vardhaman Mahaveer Open University (VMOU), Kota 324010, Rajasthan, India (malavh@yahoo.co.in; k_p_maheshwari@rediffmail.com; rsharma_vmou@yahoo.co.in)
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Abstract

The propagation of intense few-cycle laser beams in plasma media is considered when the quiver velocity of the electron approaches the velocity of light c. The modifications in the spatio-temporal profile of the initial Gaussian beam are found to depend on the combined effect of relativistic plasma frequency and diffraction. The results of the variation of the temporal profile of the envelope at points on the axis as well away from the axis are presented. The results so obtained are compared with those of vacuum propagation. Pulses get broadened and frequency gets chirped as a result of diffraction, phase dispersion and relativistic mass correction. The effect of the plasma on the group velocity dispersion including curvatures of pulse and phase fronts in pulsed Gaussian beam is numerically investigated.

Type
Papers
Information
Journal of Plasma Physics , Volume 76 , Issue 2 , April 2010 , pp. 209 - 227
Copyright
Copyright © Cambridge University Press 2009

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