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Strong terahertz radiation generation by beating of two laser beams in magnetized overdense plasma

Published online by Cambridge University Press:  22 July 2016

A. Hematizadeh ,
F. Bakhtiari ,
S. M. Jazayeri  and
B. Ghafary
A. Hematizadeh*
Affiliation:
Department of Physics, Iran University of Science & Technology, Narmak, Tehran, Iran
F. Bakhtiari
Affiliation:
Department of Physics, Iran University of Science & Technology, Narmak, Tehran, Iran
S. M. Jazayeri
Affiliation:
Department of Physics, Iran University of Science & Technology, Narmak, Tehran, Iran
B. Ghafary
Affiliation:
Department of Physics, Iran University of Science & Technology, Narmak, Tehran, Iran
*
Address correspondence and reprint requests to: A. Hematizadeh, Department of Physics, Iran University of Science & Technology, Narmak, Tehran, Iran. E-mail: hematizade@physics.iust.ac.ir
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Abstract

Terahertz (THz) radiation generation by nonlinear mixing of two laser beams, obliquely incident on an overdense plasma is investigated. In an overdense plasma, the laser beams penetrate to only thin layer of a plasma surface and reflected. At this thin layer, the laser beams exert a ponderomotive force on the electrons of plasma and impart them oscillatory velocity at the different frequency of lasers. THz waves appear in the reflected component from the plasma surface. The amplitude of THz waves can be augmented by applying the magnetic field perpendicular to the direction of propagation of lasers. It is found that the field strength of the emitted THz radiations is sensitive to the angle of incident of the laser beams, beat frequency, and magnetic field strength. In this scheme, the magnetic field strength plays an important role for strong THz wave generation.

Keywords

Overdense plasmaMagnetic fieldBeat frequencyTerahertz generation
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 3 , September 2016 , pp. 527 - 532
Copyright
Copyright © Cambridge University Press 2016 

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