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Strong terahertz radiation generation by beating of extra-ordinary mode lasers in a rippled density magnetized plasma

Published online by Cambridge University Press:  09 July 2013

Prateek Varshney ,
Vivek Sajal ,
K.P. Singh ,
Ravindra Kumar  and
Navneet K. Sharma
Prateek Varshney
Affiliation:
Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, UP, India
Vivek Sajal*
Affiliation:
Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, UP, India
K.P. Singh
Affiliation:
Singh Simtech Pvt. Ltd., Bartapur, Rajasthan, India
Ravindra Kumar
Affiliation:
Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, UP, India
Navneet K. Sharma
Affiliation:
Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, UP, India
*
Address correspondence and reprint requests to: Vivek Sajal, Department of Physics & Materials Science & Engineering, Jaypee Institute of Information Technology, Noida, UP, India-201307. E-mail: vsajal@rediffmail.com
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Abstract

A scheme of terahertz radiation generation is proposed by beating of two extra-ordinary lasers having frequencies and wave numbers $\lpar {\rm \omega}_1\comma \; \vec k_1 \rpar $ and $\lpar {\rm \omega}_2\comma \; \vec k_2 \rpar $, respectively in a magnetized plasma. Terahertz wave is resonantly excited at frequency $\lpar {\rm \omega}_1 - {\rm \omega}_2 \rpar $ and wave number (k1 − k2 + q) with a wave number mismatch factor q which is introduced by the periodicity of plasma density ripples. In this process, the lasers exert a beat ponderomotive force on plasma electrons and impart them an oscillatory velocity with both transverse and longitudinal components in the presence of transverse static magnetic field. The oscillatory velocity couples with density ripples and produces a nonlinear current that resonantly excites the terahertz radiation. Effects of periodicity of density ripples and applied magnetic field are analyzed for strong THz radiation generation. The terahertz radiation generation efficiency is found to be directly proportional to the square of density ripple amplitude and rises with the magnetic field strength. With the optimization of these parameters, the efficiency ~10−3 is achieved in the present scheme. The frequency and power of generated THz radiation can be better tuned with the help of parameters like density ripple amplitude, periodicity and applied magnetic field strength in the present scheme.

Keywords

Extraordinary LaserMagnetized PlasmaRippled PlasmaTerahertz Generation
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 2 , June 2013 , pp. 337 - 344
Copyright
Copyright © Cambridge University Press 2013 

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