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Title: Tunable and efficient terahertz radiation generation by photomixing of two super Gaussian laser pulses in a corrugated magnetized plasma

Abstract

A scheme of terahertz (THz) radiation generation is investigated by photo-mixing of two super Gaussian laser beams having different frequencies (ω{sub 1}, ω{sub 2}) and wave numbers (k{sup →}{sub 1}, k{sup →}{sub 2}) in a performed corrugated plasma embedded with transverse dc magnetic field. Lasers exert a nonlinear ponderomotive force, imparting an oscillatory velocity to plasma electrons that couples with the density corrugations (n{sup ′}=n{sub α0}e{sup iαz}) to generate a strong transient nonlinear current, that resonantly derives THz radiation of frequency ∼ω{sub h} (upper hybrid frequency). The periodicity of density corrugations is suitably chosen to transfer maximum momentum from lasers to THz radiation at phase matching conditions ω=ω{sub 1}−ω{sub 2} and k{sup →}=k{sup →}{sub 1}−k{sup →}{sub 2}+α{sup →}. The efficiency, power, beam quality, and tunability of the present scheme exhibit high dependency upon the applied transverse dc magnetic field along with q-indices and beam width parameters (a{sub 0}) of super Gaussian lasers. In the present scheme, efficiency ∼10{sup −2} is achieved with the optimization of all these parameters.

Authors:
; ; ;  [1];  [2]
  1. Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Uttar Pradesh, Noida-201307 (India)
  2. Singh Simutech Pvt. Ltd., Bharatpur, Rajasthan 321201 (India)
Publication Date:
OSTI Identifier:
22410207
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM PROFILES; BEAM-PLASMA SYSTEMS; ELECTRON DENSITY; ELECTRONS; GAUSS FUNCTION; LASERS; MAGNETIC FIELDS; MICROWAVE RADIATION; NONLINEAR PROBLEMS; OPTIMIZATION; PERIODICITY; PLASMA; PLASMA DENSITY; PONDEROMOTIVE FORCE; THZ RANGE; TRANSIENTS

Citation Formats

Varshney, Prateek, Sajal, Vivek, E-mail: vsajal@rediffmail.com, Kumar, Ravindra, Sharma, Navneet K., and Singh, Kunwar Pal. Tunable and efficient terahertz radiation generation by photomixing of two super Gaussian laser pulses in a corrugated magnetized plasma. United States: N. p., 2015. Web. doi:10.1063/1.4921357.
Varshney, Prateek, Sajal, Vivek, E-mail: vsajal@rediffmail.com, Kumar, Ravindra, Sharma, Navneet K., & Singh, Kunwar Pal. Tunable and efficient terahertz radiation generation by photomixing of two super Gaussian laser pulses in a corrugated magnetized plasma. United States. doi:10.1063/1.4921357.
Varshney, Prateek, Sajal, Vivek, E-mail: vsajal@rediffmail.com, Kumar, Ravindra, Sharma, Navneet K., and Singh, Kunwar Pal. Thu . "Tunable and efficient terahertz radiation generation by photomixing of two super Gaussian laser pulses in a corrugated magnetized plasma". United States. doi:10.1063/1.4921357.
@article{osti_22410207,
title = {Tunable and efficient terahertz radiation generation by photomixing of two super Gaussian laser pulses in a corrugated magnetized plasma},
author = {Varshney, Prateek and Sajal, Vivek, E-mail: vsajal@rediffmail.com and Kumar, Ravindra and Sharma, Navneet K. and Singh, Kunwar Pal},
abstractNote = {A scheme of terahertz (THz) radiation generation is investigated by photo-mixing of two super Gaussian laser beams having different frequencies (ω{sub 1}, ω{sub 2}) and wave numbers (k{sup →}{sub 1}, k{sup →}{sub 2}) in a performed corrugated plasma embedded with transverse dc magnetic field. Lasers exert a nonlinear ponderomotive force, imparting an oscillatory velocity to plasma electrons that couples with the density corrugations (n{sup ′}=n{sub α0}e{sup iαz}) to generate a strong transient nonlinear current, that resonantly derives THz radiation of frequency ∼ω{sub h} (upper hybrid frequency). The periodicity of density corrugations is suitably chosen to transfer maximum momentum from lasers to THz radiation at phase matching conditions ω=ω{sub 1}−ω{sub 2} and k{sup →}=k{sup →}{sub 1}−k{sup →}{sub 2}+α{sup →}. The efficiency, power, beam quality, and tunability of the present scheme exhibit high dependency upon the applied transverse dc magnetic field along with q-indices and beam width parameters (a{sub 0}) of super Gaussian lasers. In the present scheme, efficiency ∼10{sup −2} is achieved with the optimization of all these parameters.},
doi = {10.1063/1.4921357},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 19,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}