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Generation of terahertz radiation by a Hermite–Gaussian laser beam inside magnetoplasma with a density ramp

Published online by Cambridge University Press:  11 April 2023

Proxy Kad ,
Vidisha Rana  and
Arvinder Singh Open the ORCID record for Arvinder Singh [Opens in a new window]
Proxy Kad
Affiliation:
Dr. B.R. Ambedkar National Institute of Technology, Jalandhar 144011, Punjab, India
Vidisha Rana
Affiliation:
Dr. B.R. Ambedkar National Institute of Technology, Jalandhar 144011, Punjab, India
Arvinder Singh*
Affiliation:
Dr. B.R. Ambedkar National Institute of Technology, Jalandhar 144011, Punjab, India
*
†Email address for correspondence: arvinders@nitj.ac.in
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Abstract

In the present scheme of work, the Hermite–Gaussian (HG) laser beam dynamics has been investigated under the influence of an upward density ramp inside magnetized plasma, where both relativistic and ponderomotive nonlinearities are operative. One can achieve self-focusing of laser beam due to the change in the medium's dielectric function, which comes into operation due to the expulsion of plasma electrons from the high intensity to the low-intensity region by ponderomotive force and their motion at relativistic speeds. The dynamics of the laser beam and terahertz generation have been investigated by using the moment theory approach. It has been observed from the present analysis that the dynamics of the laser beam and the production of terahertz radiations strongly depends upon the HG laser beam and plasma parameters. In addition to this, the effect of density ramp and magnetic field has also been investigated on the efficiency of terahertz generation. It has been observed that higher-order modes of the HG laser beam play a dominant role in the production of terahertz radiations.

Keywords

plasma nonlinear phenomenaplasma waves
Type
Research Article
Information
Journal of Plasma Physics , Volume 89 , Issue 2 , April 2023 , 905890207
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Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press

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