Two‐dimensional self‐focusing of short intense laser pulse in underdense plasma

1993 ◽  
Vol 5 (4) ◽  
pp. 1336-1348 ◽  
Author(s):  
X. L. Chen ◽  
R. N. Sudan
Keyword(s):  
Laser Pulse ◽  
Intense Laser ◽  
Two Dimensional ◽  
Intense Laser Pulse ◽  
Self Focusing ◽  
Underdense Plasma

Effect of obliquely external magnetic field on the intense laser pulse propagating in plasma medium

2020 ◽  
Vol 34 (07) ◽  
pp. 2050044
Author(s):  
Mehdi Abedi-Varaki
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Laser Pulse ◽  
Magnetoactive Plasma ◽  
Spot Size ◽  
The Self ◽  
Intense Laser ◽  
Intense Laser Pulse ◽  
Laser Spot Size ◽  
Self Focusing

In this paper, self-focusing of intense laser pulse propagating along the obliquely external magnetic field on the collisional magnetoactive plasma by using the perturbation theory have been studied. The wave equation describing the interaction of intense laser pulse with collisional magnetoactive plasma is derived. In addition, employing source-dependent expansion (SDE) method, the analysis of the laser spot-size is discussed. It is shown that with increasing of the angle in obliquely external magnetic field, the spot-size of laser pulse decreases and as a result laser pulse becomes more focused. Furthermore, it is concluded that the self-focusing quality of the laser pulse has been enhanced due to the presence of obliquely external magnetic field in the collisional magnetoactive plasma. Besides, it is seen that with increasing of [Formula: see text], the laser spot-size reduces and subsequently the self-focusing of the laser pulse in plasma enhances. Moreover, it is found that changing the collision effect in the magnetoactive plasma leads to increases of self-focusing properties.

RELATIVISTIC SELF-FOCUSING OF AN ULTRA-INTENSE LASER PULSE IN A PLASMA

1995 ◽  
Vol 04 (03) ◽  
pp. 547-566 ◽  
Author(s):  
G. MAINFRAY
Keyword(s):  
Laser Pulse ◽  
Thomson Scattering ◽  
Hydrogen Gas ◽  
Intense Laser ◽  
Gas Jet ◽  
Intense Laser Pulse ◽  
Self Focusing ◽  
Rayleigh Length ◽  
Relativistic Regime ◽  
Order Of Magnitude

New compact multiterawatt lasers allow us to study the relativistic regime of laserplasma interaction. The propagation of a multiterawatt subpicosecond laser pulse in a plasma has been investigated theoretically and experimentally. A 10 TW laser pulse at a 1064 nm wavelength has been focused in a hydrogen gas jet. Thomson scattering observations show that a relativistic self-focusing and channeling occur when the laser power exceeds a critical value predicted by theory. The amount of enhancement in self-focused intensity exceeds one order of magnitude. The laser pulse propagates through the plasma over a distance much larger than the Rayleigh length determined by vacuum diffraction.

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