Propagation dynamics of an azimuthally polarized Bessel–Gauss laser beam in a parabolic plasma channel

2020 ◽  
Vol 27 (11) ◽  
pp. 113103
Author(s):  
Rong-An Tang ◽  
Li-Ru Yin ◽  
Xue-Ren Hong ◽  
Ji-Ming Gao ◽  
Li-Hong Cheng ◽  
...  
Keyword(s):  
Laser Beam ◽  
Plasma Channel ◽  
Propagation Dynamics ◽  
Parabolic Plasma

Effects of relativistic and channel focusing on q -Gaussian laser beam propagating in a preformed parabolic plasma channel

2017 ◽  
Vol 381 (25-26) ◽  
pp. 2065-2071 ◽  
Author(s):  
Li Wang ◽  
Xue-Ren Hong ◽  
Jian-An Sun ◽  
Rong-An Tang ◽  
Yang Yang ◽  
...  
Keyword(s):  
Laser Beam ◽  
Plasma Channel ◽  
Gaussian Laser Beam ◽  
Parabolic Plasma

Plasma channel formation in the knife-like focus of laser beam

2020 ◽  
Vol 86 (3) ◽  
Author(s):  
O. G. Olkhovskaya ◽  
G. A. Bagdasarov ◽  
N. A. Bobrova ◽  
V. A. Gasilov ◽  
L. V. N. Goncalves ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Beam ◽  
Plasma Channel ◽  
Focal Length ◽  
Computer Code ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Channel Formation ◽  
Azimuthal Symmetry ◽  
Sufficient Degree

The plasma channel formation in the focus of a knife-like nanosecond laser pulse irradiating a gas target is studied theoretically, and in gas-dynamics computer simulations. The distribution of the electromagnetic field in the focus region, obtained analytically, is used to calculate the energy deposition in the plasma, which then is implemented in the magnetohydrodynamic computer code. The modelling of the channel evolution shows that the plasma profile, which can guide the laser pulse, is formed by the tightly focused short knife-like lasers. The results of the simulations show that a proper choice of the convergence angle of a knife-like laser beam (determined by the focal length of the last cylindrical lens), and laser pulse duration may provide a sufficient degree of azimuthal symmetry of the formed plasma channel.

Propagation of sinusoidal pulse laser beam in a plasma channel

2007 ◽  
Vol 14 (11) ◽  
pp. 113105 ◽  
Author(s):  
Ajay K. Upadhyay ◽  
Gaurav Raj ◽  
Rohit K. Mishra ◽  
Pallavi Jha
Keyword(s):  
Laser Beam ◽  
Pulse Laser ◽  
Plasma Channel ◽  
Pulse Laser Beam

SHEET CROSSING AND WAVE BREAKING IN THE LASER WAKEFIELD ACCELERATOR

2007 ◽  
Vol 21 (03n04) ◽  
pp. 439-446
Author(s):  
J. VIEIRA ◽  
R. A. FONSECA ◽  
L. O. SILVA ◽  
W. LU ◽  
M. TZOUFRAS ◽  
...  
Keyword(s):  
Wave Breaking ◽  
Quantitative Estimate ◽  
Plasma Channel ◽  
Seminal Work ◽  
Laser Wakefield ◽  
Crossing Time ◽  
Time Required ◽  
Wakefield Accelerator ◽  
Parabolic Plasma ◽  
Laser Wakefield Accelerator

The seminal work of J. M. Dawson on sheet crossing and wave breaking is extended to laser wakefield scenarios. We derive a quantitative estimate for the sheet crossing time. We find that the time for the onset of sheet crossing is reduced for lower densities, higher laser intensities and smaller spot sizes. Furthermore, we show that a preformed parabolic plasma channel can decrease the time required for sheet crossing.

scholarly journals Role of Density Profiles for the Nonlinear Propagation of Intense Laser Beam through Plasma Channel

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Sonu Sen ◽  
Meenu Asthana Varshney ◽  
Dinesh Varshney
Keyword(s):  
Laser Beam ◽  
Dielectric Function ◽  
Laser Plasma ◽  
Plasma Channel ◽  
Intense Laser ◽  
Nonlinear Propagation ◽  
Density Profiles ◽  
Laser Plasma Interaction ◽  
Self Focusing

In this work role of density profiles for the nonlinear propagation of intense laser beam through plasma channel is analyzed. By employing the expression for the dielectric function of different density profile plasma, a differential equation for beamwidth parameter is derived under WKB and paraxial approximation. The laser induces modifications of the dielectric function through nonlinearities. It is found that density profiles play vital role in laser-plasma interaction studies. To have numerical appreciation of the results the propagation equation for plasma is solved using the fourth order Runge-Kutta method for the initial plane wave front of the beam, using boundary conditions. The spot size of the laser beam decreases as the beam penetrates into the plasma and significantly adds self-focusing in plasma. This causes the laser beam to become more focused by reduction of diffraction effect, which is an important phenomenon in inertial confinement fusion and also for the understanding of self-focusing of laser pulses. Numerical computations are presented and discussed in the form of graphs for typical parameters of laser-plasma interaction.

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