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Tunable terahertz radiation generation by nonlinear photomixing of cosh-Gaussian laser pulses in corrugated magnetized plasma

Published online by Cambridge University Press:  13 March 2017

P. Varshney ,
V. Sajal ,
A. Upadhyay ,
J. A. Chakera  and
R. Kumar
P. Varshney*
Affiliation:
Laser Plasma Division, Raja Ramanna Centre of Advance Technology, Indore-452013, Madhya Pradesh, India
V. Sajal
Affiliation:
Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida-201307, Uttar Pradesh, India
A. Upadhyay
Affiliation:
Laser Plasma Division, Raja Ramanna Centre of Advance Technology, Indore-452013, Madhya Pradesh, India
J. A. Chakera
Affiliation:
Laser Plasma Division, Raja Ramanna Centre of Advance Technology, Indore-452013, Madhya Pradesh, India
R. Kumar
Affiliation:
Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida-201307, Uttar Pradesh, India
*
*Address correspondence and reprint requests to: Prateek Varshney, Laser Plasma Division, Raja Ramanna Centre of Advance Technology, Indore-452013, Madhya Pradesh, India. E-mail: varshneyprateek28@yahoo.com
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Abstract

This paper presents a scheme of THz generation by nonlinear photomixing of two cosh-Gaussian lasers pulses having different frequencies (ω1, ω2) and wave numbers $(\vec k_1, \vec k_2 )$ and same electrical field amplitude in a corrugated plasma embedded with transverse static magnetic field. Cosh-Gaussian laser pulses have steep gradient in intensity profile along with wider cross-section, which exerts a stronger nonlinear ponderomotive force at ω1 − ω2 and $\vec k_1 - \vec k_2 $ on plasma electrons imparting a nonlinear oscillatory velocity to plasma electrons. Oscillatory plasma electrons couple with the density ripple n′ = nα0eiαx to produce a nonlinear current, which is responsible for resonant THz radiation at frequency $\sim\left( {{\rm \omega} _{\rm c}^2 + {\rm \omega} _{\rm p}^2} \right)^{1/2} $. The amplitude, efficiency and beam quality of THz radiation can be optimized by choosing proper corrugation factor (α of the plasma), applied magnetic field (ωc), decentered parameter (b), and beam width parameter a0 of cosh-Gaussian lasers. An efficiency of $\sim\!10^{ - 2} - 10^{ - 1} $ is achieved for laser electric field E = 3.2 × 109 V/cm.

Keywords

Cosh-Gaussian beamRippled magnetized plasmaTunable terahertz generation
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 2 , June 2017 , pp. 279 - 285
Copyright
Copyright © Cambridge University Press 2017 

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