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Excitation of terahertz radiation generation by obliquely incident beating lasers on a hot magnetized plasma with step density profile

Published online by Cambridge University Press:  16 August 2017

K.L. Mann ,
V. Sajal  and
N.K. Sharma
K.L. Mann
Affiliation:
Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, UP-201307, India
V. Sajal*
Affiliation:
Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, UP-201307, India
N.K. Sharma
Affiliation:
Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, UP-201307, India
*
Address correspondence and reprint requests to: V. Sajal, Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, UP-201307, India. E-mail: [email protected]
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Abstract

A scheme of resonant terahertz (THz) radiation generation by non-linear beating of two lasers in hot magnetized plasma with step density profile is investigated. Beating lasers of frequency difference ω1 − ω2 ≈ ωp(~1 THz) is incident obliquely on plasma surface and exerts non-linear ponderomotive force on plasma electrons. The plasma electrons start oscillating in the plane of incidence and give rise to space charge field to maintain plasma neutrality. In turn, both ponderomotive force and space charge field excites a non-linear surface current, responsible for THz radiation generation on the reflection side. The coupling between plasma wave and electromagnetic wave present (inside the plasma as well as on reflection side) becomes stronger in the presence of the transverse DC magnetic field. THz radiation amplitude is optimized at an angle of incidence θ ~ 50–70°.

Keywords

Terahertz radiation generationHot magnetized plasmaStep density profile
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 3 , September 2017 , pp. 528 - 533
Copyright
Copyright © Cambridge University Press 2017 

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