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Magnetosonic wave-aided terahertz emission by nonlinear mixing of lasers in plasmas

Published online by Cambridge University Press:  16 September 2019

Narender Kumar Open the ORCID record for Narender Kumar [Opens in a new window] ,
Ram Kishor Singh ,
R. Uma  and
R. P. Sharma
Narender Kumar*
Affiliation:
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi110016, India Department of Physics, Sri Venkateswara College, University of Delhi, New Delhi110021, India
Ram Kishor Singh
Affiliation:
Department of Physics, Shivpati Post Graduate College, Siddharth University, Siddharth Nagar 272205, India
R. Uma
Affiliation:
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi110016, India
R. P. Sharma
Affiliation:
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi110016, India
*
Author for correspondence: N. Kumar, Department of Physics, Sri Venkateswara College, University of Delhi, New Delhi110021, India. E-mail: narenderk@svc.ac.in
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Abstract

A scheme of phase-matched terahertz generation by beating two co-propagating lasers in magnetized plasma, in the presence of a magnetosonic wave (MSW), is developed. The beat frequency ponderomotive force of the lasers imparts an oscillatory drift to electrons. The electron drift velocity couples with the electron density perturbation associated with the MSW to produce an irrotational nonlinear current $\left(\nabla \times {\vec J}\;{}^{\rm NL}\ne 0\right)$. The beat current density resonantly excites a THz (Terahertz) radiation when the phase-matching conditions are satisfied. The MSW mediates the phase matching. At 9.6 and 10.6 µm wavelengths, and background magnetic field of 285 kG, one may achieve normalized THz wave amplitude of the order of 10−3 and one obtains the ratio of THz power to pump power of the order of 10−6.

Keywords

Magnetized plasmaphase-matching conditionponderomotive nonlinearityresonant excitationterahertz radiation
Type
Research Article
Information
Laser and Particle Beams , Volume 37 , Issue 4 , December 2019 , pp. 341 - 345
Copyright
Copyright © Cambridge University Press 2019

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