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Strong terahertz field generation by relativistic self-focusing of hollow Gaussian laser beam in magnetoplasma

Published online by Cambridge University Press:  09 December 2015

Saba Hussain ,
Ram Kishor Singh  and
R. P. Sharma
Saba Hussain
Affiliation:
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016, India
Ram Kishor Singh*
Affiliation:
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016, India
R. P. Sharma
Affiliation:
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016, India
*
Address correspondence and reprint requests to: R. K. Singh, Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016, India. E-mail: [email protected]
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Abstract

The present paper proposes a model for the generation of Terahertz (THz) radiation by self-focused hollow Gaussian beam (HGB) in collisionless magnetized rippled density plasma. At high intensities, the change in the electron mass occurs due to relativistic effect, introducing a nonlinearity in the plasma leading to the self-focusing of the HGB. The nonlinear interaction of this highly intense self-focused HGB with the electron plasma wave in the rippled density plasma, satisfying proper phase matching conditions, results in the resonant excitation of THz radiations at the beat frequency. We have studied the dependence of generated THz radiations on the order of the HGB as well as on the static background magnetic field. The results show that the intensity of the generated radiations is highly sensitive to both of these parameters. For the current scheme the power of the generated THz waves comes out to be of the order of Gigawatts.

Keywords

Hollow Gaussian laser beamRelativistic nonlinearitySelf-focusingTHz radiation
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 1 , March 2016 , pp. 86 - 93
Copyright
Copyright © Cambridge University Press 2015 

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