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Generation of terahertz radiation in collisional plasma by beating of two dark hollow laser beams

Published online by Cambridge University Press:  10 June 2015

Farhad Bakhtiari ,
Shole Golmohammady ,
Masoud Yousefi ,
Fatemeh D. Kashani  and
Bijan Ghafary
Farhad Bakhtiari*
Affiliation:
Photonics Lab, Physics Department, Iran University of Science & Technology, Heydarkhani, Tehran, Iran
Shole Golmohammady
Affiliation:
Photonics Lab, Physics Department, Iran University of Science & Technology, Heydarkhani, Tehran, Iran
Masoud Yousefi
Affiliation:
Photonics Lab, Physics Department, Iran University of Science & Technology, Heydarkhani, Tehran, Iran
Fatemeh D. Kashani
Affiliation:
Photonics Lab, Physics Department, Iran University of Science & Technology, Heydarkhani, Tehran, Iran
Bijan Ghafary
Affiliation:
Photonics Lab, Physics Department, Iran University of Science & Technology, Heydarkhani, Tehran, Iran
*
Address correspondence and reprint requests to: Farhad Bakhtiari, Photonics Lab, Physics Department, Iran University of Science & Technology, Heydarkhani, Tehran, Iran. E-mail: fbakhtiari@physics.iust.ac.ir
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Abstract

This paper presents a scheme of terahertz radiation generation based on beating of two dark hollow laser beams with different frequencies, the same electric field amplitudes, in actual plasma with spatially periodic density that electron–neutral collisions have taken into account. The main feature of considered hollow laser beams is, having the same power at different beam orders. Because of special distribution in beam intensity gradient in dark hollow laser beam, the produced terahertz radiation has special field profile. The effects of laser and plasma parameters on terahertz radiation generation are investigated analytically. It can be deduced that by increasing beating frequency, efficiency of terahertz generation decreases which can be compensated by manipulating density ripple magnitudes and dark-size adjusting parameter. The intensity of the emitted radiations is found to be highly sensitive to the beam order. Based on the results of this paper, optimization of laser and plasma parameters can increase the efficiency of terahertz radiation generation strongly.

Keywords

BeatingCollisional plasmaDark hollow beamTerahertz generation
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 3 , September 2015 , pp. 463 - 472
Copyright
Copyright © Cambridge University Press 2015 

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References

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