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Resonant third harmonic generation in clusters with density ripple: Effect of pulse slippage

Published online by Cambridge University Press:  08 January 2016

Shivani Vij ,
Niti Kant  and
Munish Aggarwal
Shivani Vij
Affiliation:
Department of Applied Sciences, DAV Institute of Engineering and Technology, Jalandhar-144008, India
Niti Kant
Affiliation:
Department of Physics, Lovely Professional University, Phagwara-144411, India
Munish Aggarwal*
Affiliation:
Department of Physics, Lyallpur Khalsa College of Engineering, Jalandhar-144001, India
*
Address correspondence and reprint requests to: Munish Aggarwal, Department of Physics, Lyallpur Khalsa College of Engineering, Jalandhar-144001, India. E-mail: [email protected]
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Abstract

A model is presented for the resonant third harmonic generation of short pulse lasers in cluster plasma in the presence of density ripple. Because of ripple in cluster density and plasma electron density outside the cluster, the phase-matching condition for the third harmonic process is satisfied, leading to resonant enhancement of harmonic generation. We explore the impact of laser intensity, cluster size, and collisional frequency of electrons on the efficiency of third harmonic generation. Moreover, since the group velocity of the third harmonic wave is greater than that of the fundamental wave, it causes the slippage of the generated harmonic pulse out of the fundamental laser pulse and its amplitude increases with time.

Keywords

Atomic clusterDensity rippleHarmonic generation
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 1 , March 2016 , pp. 171 - 177
Copyright
Copyright © Cambridge University Press 2016 

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