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Effect of plasma channel non-uniformity on resonant third harmonic generation

Published online by Cambridge University Press:  29 July 2013

Anuraj Panwar ,
Chang-Mo Ryu  and
Ashok Kumar
Anuraj Panwar
Affiliation:
Department of Physics, POSTECH, Hyoja-Dong San 31, KyungBuk, Pohang, South Korea, 790-784
Chang-Mo Ryu*
Affiliation:
Department of Physics, POSTECH, Hyoja-Dong San 31, KyungBuk, Pohang, South Korea, 790-784
Ashok Kumar
Affiliation:
Physics Department, ATAS, ASET, Amity University, Noida, Uttar Pradesh 201303, India
*
Address correspondence and reprint requests to: Chang-Mo Ryu, Department of Physics, POSTECH, Hyoja-Dong San 31, KyungBuk, Pohang, South Korea, 790-784. E-mail: ryu201@postech.ac.kr
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Abstract

We study the generation of resonant third harmonic laser radiation in a density non-uniform rippled plasma channel. An introduction of plasma channel non-uniformity strongly enhances the self-focusing and compression of main laser pulse at lower powers. In a deeper plasma channel, self-focusing is less sensitive to laser amplitude variation but increases compression. Plasma density ripple ‘nq’ leading to resonant third harmonic generation when kq = 4ω2p/3meω0cγ0, where ‘ω’p is electron plasma frequency, ‘ω0’ is laser frequency, and ‘γ0’ is the electron Lorentz factor. Third harmonic is produced through the beating of ponderomotive force induced second harmonic density oscillations and the oscillatory velocity of electrons at main laser frequency. The self-focusing and compression of the fundamental pulse periodically enhances the intensity of the third-harmonic pulse at lower powers of main laser. In a deeper plasma channel, the third harmonic power is less effective by self-focusing and the compression of main laser, and increase with main laser pulse power.

Keywords

Plasma channel non-uniformitySelf-focusingThird harmonic laser radiation
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 3 , September 2013 , pp. 531 - 537
Copyright
Copyright © Cambridge University Press 2013 

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