Hostname: page-component-848d4c4894-sjtt6 Total loading time: 0 Render date: 2024-06-15T15:23:06.006Z Has data issue: false hasContentIssue false

Exponential density transition-based enhanced second harmonic generation in plasma

Published online by Cambridge University Press:  12 October 2018

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

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.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2018 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Aggarwal, M, Vij, S and Kant, N (2015) Wiggler magnetic field assisted second harmonic generation in clusters. European Physical Journal D 69, 149154.Google Scholar
Aggarwal, M, Kumar, H and Kant, N (2016) Propagation of Gaussian laser beam through magnetized cold plasma with increasing density ramp. Optik-International Journal for Light and Electron Optics 127, 22122216.Google Scholar
Askari, HR and Noroozi, M (2009) Effect of a wiggler magnetic field and the ponderomotive force on the second harmonic generation in laser-plasma interactions. Turkish Journal of Physics 33, 299310.Google Scholar
Brandi, HS, Maianeto, PA and Guerra, ES (1996) Second-harmonic generation by intense lasers in inhomogeneous plasmas. Physical Review E 54, 1001.Google Scholar
Burnett, NH, Baldis, HA, Richardson, MC and Enright, GD (1977) Harmonic generation in CO2 laser target interaction. Applied Physics Letters 31, 172.Google Scholar
Elahi, SA and Ghoranneviss, M (2014) Evolution of the IR-T1 Tokamak plasma local and global parameters. Journal of Fusion Energy 33, 17.Google Scholar
Ghorbanalilu, M (2012) Second and third harmonics generation in the interaction of strongly magnetized dense plasma with an intense laser beam. Laser and Particle Beams 30, 291.Google Scholar
Ghotra, HS and Kant, N (2015) Electron acceleration to GeV energy by a chirped laser pulse in vacuum in the presence of azimuthal magnetic field. Applied Physics B: Photophysics and Laser Chemistry 120, 141147.Google Scholar
Huillier, AL and Balcou, Ph (1993) High-order harmonic generation in rare gases with a 1-ps 1053-nm laser. Physical Review Letters 70, 774.Google Scholar
Jha, P, Mishra, RK, Raj, G and Upadhyay, AK (2007) Second harmonic generation in laser magnetized–plasma interaction. Physics of Plasmas 14, 053107.Google Scholar
Kant, N and Thakur, V (2015) Enhanced resonant second harmonic generation in plasma based on density transition. Nukleonika 60, 355.Google Scholar
Kant, N, Gupta, DN and Suk, H (2011 a) Generation of second-harmonic radiations of a self-focusing laser from a plasma with density-transition. Physics Letters A 375, 3134.Google Scholar
Kant, N, Saralch, S and Singh, H (2011 b) Pondemorotive self-focusing of a short laser pulse under a plasma density ramp. Nukleonika 56, 149153.Google Scholar
Krushelnick, K, Ting, A, Burris, HR, Fisher, A, Manka, C and Esarey, E (1995) Second harmonic generation of stimulated raman scattered light in underdense plasmas. Physical Review Letters 75, 3681.Google Scholar
Kumar, H, Aggarwal, M and Gill, TS (2018) Self-focusing of an elliptic-Gaussian laser beam in relativistic ponderomotive plasma using a ramp density profile. Journal of the Optical Society of America B 35, 16351641.Google Scholar
Li, XF, Huillier, AL, Ferray, M, Lompr, LA and Mainfray, G (1989) Multiple-harmonic generation in rare gases at high laser intensity. Physical Review A 39, 5751.Google Scholar
McPherson, A, Gibson, G, Jara, H, Johann, U, Luk, TS, McIntyre, IA, Boyer, K and Rhodes, CK (1987) Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases. Journal of the Optical Society of America B 4, 595.Google Scholar
Mori, M, Takahashi, E and Kondo, K (2002) Image of second harmonic emission generated from ponderomotively excited plasma density gradient. Physics of Plasmas 9, 2812.Google Scholar
Nanda, V and Kant, N (2014) Strong self-focusing of a cosh-Gaussian Laser Beam in collisionless magneto-plasma under plasma density ramp. Physics of Plasmas 21, 072111–8.Google Scholar
Parashar, J and Pandey, HD (1992) Second-harmonic generation of laser radiation in a plasma with a density ripple. IEEE Transactions on Plasma Science 20, 996.Google Scholar
Sharma, H, Jaloree, H and Parashar, J (2013) Magnetic wiggler-assisted third-harmonic generation of a Gaussian laser pulse in plasma. Turkish Journal of Physics 37, 368374.Google Scholar
Singh, A and Walia, K (2011) Self-focusing of Gaussian Laser Beam through collisionless plasmas and its effect on second harmonic generation. Journal of Fusion Energy 30, 555560.Google Scholar
Singh, M, Jain, AP and Parashar, J (2002) Phase matched second harmonic generation of an intense laser in plasma with a density ripple. Journal of the Indian Institute of Science 82, 183.Google Scholar
Sodha, MS, Ghatak, AK and Tripathi, VK (1974) Self-focusing of laser beams in dielectric, plasmas and semiconductor. New Delhi: Tata McGraw–Hill Pub.Google Scholar
Tewari, DP and Tripathi, VK (1980) Second-harmonic generation of upper-hybrid radiation in a plasma. Physical Review A 21, 1698.Google Scholar
Vaziri, M, Sohaliya, S and Bahrampour, A (2015) Resonant second harmonic generation in plasma by self-focused twisted beam. Optics Communications 341, 295301.Google Scholar
Vij, S, Kant, N and Aggarwal, M (2016) Resonant third harmonic generation in clusters with density ripple: effect of pulse slippage. Laser and Particle Beams 34, 171177.Google Scholar
Vij, S, Aggarwal, M and Kant, N (2017) Phase-matched relativistic second harmonic generation in clusters with density ripple. Optics Communications 383, 349354.Google Scholar
Wadhwani, N, Kumar, P and Jha, P (2002) Nonlinear theory of propagation of intense laser pulses in magnetized plasma. Physics of Plasmas 9, 263.Google Scholar
Walia, K (2016) Effect of self-focusing of elliptical laser beam on second harmonic generation in collisionless plasma. Research article. Optik – International Journal for Light and Electron Optics 127, 66186624.Google Scholar
Zheng, J, Tanaka, KA, Sentoku, Y, Offenberger, AA, Kitagawa, Y, Kodama, R, Kurahashi, J, Mima, K and Yamanaka, T (2002) Harmonic emission with cyclotron satellite structure due to strong magnetic fields produced by ultra-intense laser–plasma interaction. Physics of Plasmas 9, 3193.Google Scholar