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Strong terahertz radiation generation by cosh-Gaussian laser beams in axially magnetized collisional plasma under non-relativistic ponderomotive regime

Published online by Cambridge University Press:  30 July 2018

Prateek Varshney ,
Ajit Upadhayay ,
K. Madhubabu ,
Vivek Sajal  and
J. A. Chakera
Prateek Varshney*
Affiliation:
Laser Plasma Section, Raja Ramanna Center for Advance Technology, Indore, Madhya Pradesh-452013, India
Ajit Upadhayay
Affiliation:
Laser Plasma Section, Raja Ramanna Center for Advance Technology, Indore, Madhya Pradesh-452013, India
K. Madhubabu
Affiliation:
Laser Plasma Section, Raja Ramanna Center for Advance Technology, Indore, Madhya Pradesh-452013, India
Vivek Sajal
Affiliation:
Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, Uttar Pradesh-201307, India
J. A. Chakera
Affiliation:
Laser Plasma Section, Raja Ramanna Center for Advance Technology, Indore, Madhya Pradesh-452013, India
*
Author for correspondence: Prateek Varshney, Laser Plasma Section, Raja Ramanna Center for Advance Technology, Indore, Madhya Pradesh-452013, India, E-mail: varshneyprateek28@yahoo.com, varshneyprateek28@gmail.com
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Abstract

We propose a scheme for terahertz (THz) radiation generation by non-linear mixing of two cosh-Gaussian laser beams in axially magnetized plasma with spatially periodic density ripple where electron-neutral collisions have been taken into account. The laser beams exert a non-linear ponderomotive force due to spatial non-uniformity in the intensity. The plasma electrons acquire non-linear oscillatory velocity under the influence of ponderomotive force. This oscillatory velocity couples with preformed density ripples (n′ = n0αeiαz) to generate a strong transient non-linear current that resonantly derives THz radiation of frequency ~ωh (upper hybrid frequency). Laser frequencies (ω1 and ω2) are chosen such that the beat frequency (ω) lies in the THz region. The periodicity of density ripple provides phase-matching conditions (ω = ω1 − ω2 and $\vec k = \vec k_1 - \vec k_2 + {\rm \vec \alpha} $) to transfer maximum momentum from laser to THz radiation. The axially applied external magnetic field can be utilized to enhance the non-linear coupling and control various parameters of generated THz wave. The effects of decentered parameters (b), collisional frequency (νen), and magnetic field strength (B0 = ωcm/e) are analyzed for strong THz radiation generation. Analytical results show that the amplitude of THz wave enhances with decentered parameters as well as with the magnitude of axially applied magnetic field. The THz amplitude is found to be highly sensitive to collision frequency.

Keywords

Collisional plasmacosh-Gaussian beamrippled plasmaTerahertz radiation
Type
Research Article
Information
Laser and Particle Beams , Volume 36 , Issue 2 , June 2018 , pp. 236 - 245
Copyright
Copyright © Cambridge University Press 2018 

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