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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, 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, 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. https://doi.org/10.1063/1.4921357
Varshney, Prateek, Sajal, Vivek, Kumar, Ravindra, Sharma, Navneet K., and Singh, Kunwar Pal. 2015. "Tunable and efficient terahertz radiation generation by photomixing of two super Gaussian laser pulses in a corrugated magnetized plasma". United States. https://doi.org/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 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},
url = {https://www.osti.gov/biblio/22410207}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 19,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}