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Exponential density transition-based enhanced second harmonic generation in plasma

Published online by Cambridge University Press:  12 October 2018

Vishal Thakur  and
Niti Kant
Vishal Thakur
Affiliation:
Department of Physics, Lovely Professional University, G.T. Road, Phagwara – 144411, Punjab, India
Niti Kant*
Affiliation:
Department of Physics, Lovely Professional University, G.T. Road, Phagwara – 144411, Punjab, India
*
Author for correspondence: Niti Kant, Department of Physics, Lovely Professional University, G.T. Road, Phagwara – 144411, Punjab, India. E-mail: nitikant@yahoo.com
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Abstract

Enhanced harmonic generation of second order based on exponential density ramp in plasma has been noticed. It is well known that self-focusing of pump laser induces a transverse intensity gradient, which gives rise to the plasma wave at the pump frequency. Highly intense Gaussian laser with exponential density ramp profile generates a second harmonic pulse in plasma. It is noticed that the amplitude of second-harmonic pulse varies periodically with the distance and reaches its peak value in the focal region. Further, it is found that exponential plasma density ramp is useful for stronger self-focusing, which lead to rise second harmonic generation (SHG). Wiggler magnetic field provides the additional angular momentum required for second harmonic photon and aids in growing of resonant process. One may clearly see that exponential plasma density ramp imparts a major role in enhancing the SHG in plasma. Further, the combined effect of exponential density ramp and wiggler magnetic field boosts the SHG in plasma.

Keywords

Exponential density rampplasma Gaussian lasersecond harmonic generationwiggler magnetic field
Type
Research Article
Information
Laser and Particle Beams , Volume 36 , Issue 3 , September 2018 , pp. 363 - 368
Copyright
Copyright © Cambridge University Press 2018 

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