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Effects of transverse static electric field on terahertz radiation generation by beating of two transversely modulated Gaussian laser beams in a plasma

Published online by Cambridge University Press:  10 June 2014

Prateek Varshnety ,
Vivek Sajal ,
Prashant Chauhan ,
Ravindra Kumar  and
Navneet K. Sharma
Prateek Varshnety
Affiliation:
Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology, Uttar Pradesh, India
Vivek Sajal*
Affiliation:
Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology, Uttar Pradesh, India
Prashant Chauhan
Affiliation:
Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology, Uttar Pradesh, India
Ravindra Kumar
Affiliation:
Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology, Uttar Pradesh, India
Navneet K. Sharma
Affiliation:
Department of Physics and Material Science and Engineering, Jaypee Institute of Information Technology, Uttar Pradesh, India
*
Address correspondence and reprint requests to: Vivek Sajal, Department of Physics and Material Science & Engineering, Jaypee Institute of Information Technology, Noida-201307, Uttar Pradesh, India. E-mail: vsajal@rediffmail.com
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Abstract

Resonant excitation of terahertz (THz) radiation by nonlinear coupling of two filamented spatial-Gaussian laser beams of different frequencies and wave numbers is studied in plasma having transverse static electric field. The static ponderomotive force due to filamented lasers is balanced by the pressure gradient force which gives rise to transverse density ripple, while, the nonlinear ponderomotive force at frequency difference of beating lasers couples with density ripple giving rise to stronger transverse nonlinear current which results into the excitation of THz radiation at resonance. The coupling is further enhanced by the presence of static electric field and spatial-Gaussian nature of laser beams. An increase of six-fold in the normalized amplitude of THz is observed by applying a direct current field of about 50 KV. Effects of frequency, laser beam width, and periodicity factor of modulated laser amplitude are studied for the efficient THz radiation generation. These results can be utilized for generating controlled tunable THz sources for medical applications using low filament intensities (~ 1014 W/cm2) of beating lasers.

Keywords

Gaussian laserMagnetized plasmaTerahertz generation
Type
Research Article
Information
Laser and Particle Beams , Volume 32 , Issue 3 , September 2014 , pp. 375 - 381
Copyright
Copyright © Cambridge University Press 2014 

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