Effect of inertial ponderomotive force and self-focusing of the fundamental pulse on generation of second harmonic in magnetic plasma

Optik ◽  
2018 ◽  
Vol 158 ◽  
pp. 1450-1459 ◽  
Author(s):  
H.R. Askari ◽  
A. Mozafari
Keyword(s):  
Ponderomotive Force ◽  
Second Harmonic ◽  
Self Focusing ◽  
Fundamental Pulse ◽  
Magnetic Plasma

scholarly journals Second-harmonic generation by a chirped laser pulse with the exponential density ramp profile in the presence of a planar magnetostatic wiggler

2019 ◽  
Vol 37 (4) ◽  
pp. 442-447 ◽  
Author(s):  
Niti Kant ◽  
Arvinder Singh ◽  
Vishal Thakur
Keyword(s):  
Laser Pulse ◽  
Second Harmonic Generation ◽  
Lorentz Force ◽  
Plasma Wave ◽  
Plasma Density ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Second Order ◽  
Self Focusing ◽  
Chirped Laser Pulse

AbstractSecond-harmonic generation of the relativistic self-focused chirped laser pulse in plasma has been studied with the exponential plasma density ramp profile in the presence of a planar magnetostatic wiggler. It is evident that the exponential plasma density ramp is helpful in enhancing second-harmonic generation as, with the introduction of the exponential plasma density ramp, self-focusing becomes stronger and hence, it leads to enhance the harmonic generation of the second order in the plasma. Also, it is observed that the efficiency of second-harmonic generation enhances significantly with an increase in the value of the chirp parameter. Further, the magnetostatic wiggler helps in enhancing the harmonic generation of the second order. This is due to the fact that dynamics of the oscillating electrons is altered due to the Lorentz force which, in turn, modifies the plasma wave and, hence, results in the efficient second-harmonic generation.

Second harmonic emission and ponderomotive force in laser-created plasma

1982 ◽  
Author(s):  
A. P. Schwarzenbach ◽  
J. E. Balmer ◽  
P. Ladrach ◽  
H. P. Weber
Keyword(s):  
Ponderomotive Force ◽  
Second Harmonic ◽  
Harmonic Emission

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

2013 ◽  
Vol 31 (3) ◽  
pp. 531-537 ◽  
Author(s):  
Anuraj Panwar ◽  
Chang-Mo Ryu ◽  
Ashok Kumar
Keyword(s):  
Laser Pulse ◽  
Harmonic Generation ◽  
Plasma Channel ◽  
Second Harmonic ◽  
Third Harmonic Generation ◽  
Laser Frequency ◽  
The Self ◽  
Third Harmonic ◽  
The Third ◽  
Self Focusing

AbstractWe 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.

Effect of self-focusing on parametric back-scattering and absorptive instabilities in a plasma

1977 ◽  
Vol 18 (3) ◽  
pp. 551-561 ◽  
Author(s):  
M. S. Sodha ◽  
S. C. Kaushik ◽  
R. P. Sharma
Keyword(s):  
Growth Rates ◽  
Ponderomotive Force ◽  
Plasma Frequency ◽  
Collisionless Plasma ◽  
Self Focusing ◽  
Back Scattering ◽  
Plane Transverse ◽  
Guide Mode ◽  
Absolute Growth ◽  
Pump Laser Beam

This paper presents an investigation of the effect of self-focusing on the absolute growth rates of parametric back-scattering (e.g. stimulated Raman and Brillouin scatterings) and absorptive instabilities (e.g. two-plasmon decay and ion–plasmon decay) in a homogeneous and collisionless plasma. Gaussian intensity distribution of the pump laser beam causes the redistribution of carriers in the plane transverse to the beam propagation on account of the ponderomotive force, and leads the beam to propagate in an oscillatory wave guide mode. The modifications in plasma frequency and intensity of the beam cause the growth rates of the above parametric instabilities to show an oscillatory behaviour with the distance of propagation.

scholarly journals Self-focusing of asymmetric cosh-Gaussian laser beams propagating through collisionless magnetized plasma

2017 ◽  
Vol 35 (4) ◽  
pp. 670-676 ◽  
Author(s):  
B. D. Vhanmore ◽  
S. D. Patil ◽  
A. T. Valkunde ◽  
T. U. Urunkar ◽  
K. M. Gavade ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Ponderomotive Force ◽  
Beam Width ◽  
Magnetized Plasma ◽  
Laser Beams ◽  
Gaussian Beams ◽  
Equation Approach ◽  
Kutta Method ◽  
Runge Kutta Method ◽  
Self Focusing

AbstractIn this paper, self-focusing of asymmetric cosh-Gaussian laser beams in collisionless magnetized plasma has been studied. The non-linearity in dielectric constant considered herein is mainly due to the ponderomotive force. The non-linear coupled differential equations for the beam width parameters in transverse dimensions of the beam have been obtained by using WKB and paraxial approximations under parabolic equation approach. The numerical computation is completed by using fourth-order Runge–Kutta method. The effect of unlike decentered parameters in both transverse dimensions of the beam on self-focusing of cosh-Gaussian beams has been presented. Further, the effect of the static magnetic field and polarization modes of the laser has been explored.

Influence of small-scale self-focusing on second harmonic generation in an intense laser field

2010 ◽  
Vol 40 (6) ◽  
pp. 503-508 ◽  
Author(s):  
V N Ginzburg ◽  
V V Lozhkarev ◽  
S Yu Mironov ◽  
A K Potemkin ◽  
Efim A Khazanov
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Laser Field ◽  
Second Harmonic ◽  
Intense Laser ◽  
Small Scale ◽  
Intense Laser Field ◽  
Self Focusing
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