scholarly journals Ponderomotive self-focusing of linearly polarized laser beam in magnetized quantum plasma

2016 ◽  
Vol 34 (4) ◽  
pp. 764-771 ◽  
Author(s):  
N. S. Rathore ◽  
P. Kumar
Keyword(s):  
Laser Beam ◽  
Ponderomotive Force ◽  
Density Perturbation ◽  
Spot Size ◽  
High Density ◽  
Intense Laser ◽  
Quantum Plasma ◽  
Quantum Hydrodynamic Model ◽  
Self Focusing ◽  
Linearly Polarized

AbstractPonderomotive non-linearities arising by propagation of a linearly polarized laser beam through high-density quantum plasma are studied. The intense laser beam sets the plasma electrons in quiver motion and consequently ponderomotive non-linearity sets in leading to electron density perturbation inside the plasma. The interaction formalism has been built using the quantum hydrodynamic model. Laser beam traversing through high-density quantum plasma acquires an additional focusing tendency due to the perturbation induced by ponderomotive force in the plasma density. The ponderomotive force causes the beam to focus and the quantum effects contribute in focusing. The transverse magnetization of quantum plasma enhances the self-focusing and increase in magnetic field limits the spot size.

Laser beam guiding in partially stripped magnetized quantum plasma

Laser Physics ◽  
2021 ◽  
Vol 32 (1) ◽  
pp. 016002
Author(s):  
Punit Kumar ◽  
Nisha Singh Rathore
Keyword(s):  
Laser Beam ◽  
Spot Size ◽  
Quantum Plasma ◽  
Beam Power ◽  
Linear Wave ◽  
Linear Wave Equation ◽  
Quantum Hydrodynamic Model ◽  
Bohm Potential ◽  
Expansion Technique ◽  
Linearly Polarized

Abstract Relativistic and ponderomotive nonlinearities arising by the passage of a linearly polarized laser beam through a partially stripped magnetized quantum plasma are analyzed. The interaction formalism has been developed using the recently developed quantum hydrodynamic model. The effects associated with the Fermi pressure, quantum Bohm potential and electron spin have been incorporated. A nonparaxial, non-linear wave equation has been obtained by the use of source dependent expansion technique and spot size has been evaluated. The nonlinear relativistic self-focusing tends to focus the beam while the ponderomotive nonlinearity tends to defocus. The effect of magnetization and quantum effects on the spot size and the beam power have been studied.

scholarly journals Relativistic ponderomotive self-focusing of quadruple Gaussian laser beam in cold quantum plasma

2018 ◽  
Vol 36 (3) ◽  
pp. 353-358 ◽  
Author(s):  
Richa ◽  
Munish Aggarwal ◽  
Harish Kumar ◽  
Ranju Mahajan ◽  
Navdeep Singh Arora ◽  
...  
Keyword(s):  
Refractive Index ◽  
Laser Beam ◽  
Electron Temperature ◽  
Density Perturbation ◽  
Beam Width ◽  
Quantum Plasma ◽  
Gaussian Laser Beam ◽  
Self Focusing ◽  
Linear Differential ◽  
Paraxial Ray

AbstractIn the present paper, we have investigated self-focusing of the quadruple Gaussian laser beam in underdense cold quantum plasma. The non-linearity chosen is associated with the relativistic mass effect that arises due to quiver motion of electron and electron density perturbation caused by ponderomotive force. The non-linearity modifies the plasma frequency in the dielectric function and hence the refractive index of the medium. The focusing/defocusing of the quadruple laser depends on the refractive index of the medium. We have set up non-linear differential equation that controls the beam width parameter by using well-known paraxial ray approximation and Wentzel–Krammers–Brillouin approximation. The effect of intensity parameter and electron temperature is observed on laser beam self-focusing in the presence of cold quantum plasma. From the results, it is revealed that electron temperature and the initial intensity of the laser beam control the profile dynamics of the laser beam.

scholarly journals Relativistic Gaussian laser beam self-focusing in collisional quantum plasmas

2015 ◽  
Vol 33 (3) ◽  
pp. 397-403 ◽  
Author(s):  
S. Zare ◽  
S. Rezaee ◽  
E. Yazdani ◽  
A. Anvari ◽  
R. Sadighi-Bonabi
Keyword(s):  
Laser Beam ◽  
Laser Energy ◽  
Oscillation Amplitude ◽  
Beam Width ◽  
Spot Size ◽  
Collisional Plasma ◽  
Laser Spot ◽  
Quantum Plasma ◽  
Laser Spot Size ◽  
Self Focusing

AbstractPropagation of Gaussian X-ray laser beam is presented in collisional quantum plasma and the beam width oscillation is studied along the propagation direction. It is noticed that due to energy absorption in collisional plasma, the laser energy drops to an amount less than the critical value of the self-focusing effect and consequently, the laser beam defocuses. It is found that the oscillation amplitude of the laser spot size enhances while passing through collisional plasma. For the greater values of collision frequency, the beam width oscillates with higher amplitude and defocuses in a shallower plasma depth. Also, it is realized that in a dense plasma environment, the laser self-focusing occurs earlier with the higher oscillation amplitude, smaller laser spot size and more oscillations.

scholarly journals Self-Focusing of High-Power Laser Beam Through Cold Uniform Magnetized Plasma

2020 ◽  
Vol 3 (11) ◽  
pp. 137-140
Author(s):  
Sudarshan Kumar Chakravarti
Keyword(s):  
Laser Beam ◽  
Expansion Method ◽  
Spot Size ◽  
Magnetized Plasma ◽  
Intense Laser ◽  
Gaussian Profile ◽  
Self Focusing ◽  
Focusing Property ◽  
Set Up

In present paper the determination of the spot size of an ultra-short laser beam in uniform magnetized plasma with a dominant cold plasma has been studied. The liner dispersion relation of the laser beam propagating in Magnetized plasma have been found. Magnetic field is set up and source dependent expansion method is applied to determining the spot size of the intense laser beam with gaussian profile. The transverse magnetization of plasma and its impact on the self-focusing property of the dense laser governing to reduction in critical power necessary to self-focusing beam is shown.

scholarly journals Electron acceleration by whistler pulse in high-density plasma

2017 ◽  
Vol 35 (3) ◽  
pp. 386-390
Author(s):  
A.K. Singh
Keyword(s):  
Cyclotron Frequency ◽  
Ponderomotive Force ◽  
Plasma Frequency ◽  
Threshold Value ◽  
High Density ◽  
Quantum Plasma ◽  
Quantum Hydrodynamic Model ◽  
Threshold Amplitude ◽  
Dirac Distribution ◽  
Quantum Hydrodynamic

AbstractThe acceleration of an electron by the ponderomotive force of a Gaussian whistler pulse in a magnetized high-density quantum plasma obeying Fermi–Dirac distribution is studied using the recently developed quantum hydrodynamic model. Effective acceleration takes place when the peak whistler amplitude exceeds a threshold value, and the whistler frequency is greater than the cyclotron frequency. The threshold amplitude decreases with ratio of plasma frequency to electron cyclotron frequency. The electron is accelerated at velocities of about twice the group velocity of the whistler.

scholarly journals Self-Focusing of Hermite-Cosh-Gaussian Laser Beams in Plasma under Density Transition

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Manzoor Ahmad Wani ◽  
Niti Kant
Keyword(s):  
Laser Beam ◽  
Plasma Density ◽  
Focal Spot ◽  
Beam Width ◽  
Spot Size ◽  
Laser Beams ◽  
Equation Approach ◽  
Focal Spot Size ◽  
Self Focusing ◽  
Small Spot

Self-focusing of Hermite-Cosh-Gaussian (HChG) laser beam in plasma under density transition has been discussed here. The field distribution in the medium is expressed in terms of beam-width parameters and decentered parameter. The differential equations for the beam-width parameters are established by a parabolic wave equation approach under paraxial approximation. To overcome the defocusing, localized upward plasma density ramp is considered, so that the laser beam is focused on a small spot size. Plasma density ramp plays an important role in reducing the defocusing effect and maintaining the focal spot size up to several Rayleigh lengths. To discuss the nature of self-focusing, the behaviour of beam-width parameters with dimensionless distance of propagation for various values of decentered parameters is examined by numerical estimates. The results are presented graphically and the effect of plasma density ramp and decentered parameter on self-focusing of the beams has been discussed.

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