Laser guiding plasma channel formation criterion in highly relativistic regime

2011 ◽  
Vol 99 (24) ◽  
pp. 241501 ◽  
Author(s):  
Y. J. Gu ◽  
Z. Zhu ◽  
Q. Kong ◽  
Y. Y. Li ◽  
X. F. Li ◽  
...  
Keyword(s):  
Plasma Channel ◽  
Channel Formation ◽  
Laser Guiding ◽  
Relativistic Regime

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.

Guiding of a laser beam in collisional magnetoplasma channel

2012 ◽  
Vol 78 (3) ◽  
pp. 249-257
Author(s):  
ARVINDER SINGH ◽  
NAVPREET SINGH
Keyword(s):  
Laser Beam ◽  
Plasma Channel ◽  
Beam Width ◽  
Theory Approach ◽  
Uniform Heating ◽  
Laser Guiding ◽  
Set Up ◽  
The Moment ◽  
Preformed Plasma ◽  
Uniform Plasma

AbstractLaser guiding through an axially non-uniform collisional magnetoplasma channel formed by ionizing laser prepulse has been investigated. Self-defocusing of the ionizing prepulse leads to an axial non-uniform plasma channel. Due to the propagation of second laser beam through such preformed plasma channel, non-uniform heating of electrons takes place on account of non-uniform intensity distribution of laser beam. Non-uniform heating diffuses the electrons away from the axis and thereby enhances the plasma channel. Due to the competition between diffraction and refraction phenomenon through such an axial non-uniform collisional magnetoplasma channel, there is a periodic beam width variation with the distance of propagation. Second order ordinary differential equations for the beam width parameter of prepulse and the guided beam have been set up using the moment theory approach. Effect of axial non-uniformity, intensity of guided beam and magnetic field has been seen on the propagation of the second guided beam in the plasma channel.

scholarly journals Simulations of plasma channel formation by knife-like nanosecond laser beam

2018 ◽  
pp. 1-39
Author(s):  
Pavel Vasilievich Sasorov ◽  
Nadejda Aleksandrovna Bobrova ◽  
Olga Gourgenovna Olkhovskaya ◽  
Gennadiy Alekseevich Bagdasarov ◽  
Aleksey Sergeevich Boldarev ◽  
...  
Keyword(s):  
Laser Beam ◽  
Plasma Channel ◽  
Nanosecond Laser ◽  
Channel Formation
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