Radial field distributions in a self-focusing light beam

1967 ◽  
Vol 9 (2) ◽  
pp. 261-263 ◽  
Author(s):  
Z. K. Yankauskas
Keyword(s):  
Light Beam ◽  
Radial Field ◽  
Field Distributions ◽  
Self Focusing

scholarly journals About the modeling of light beam self-focusing in plasma at the irradiation of the target by power UV laser

2021 ◽  
Vol 9 (1) ◽  
pp. 79-86
Author(s):  
I. G. Lebo
Keyword(s):  
Laser Beam ◽  
Light Beam ◽  
Large Scale ◽  
Critical Density ◽  
Calculated Data ◽  
Aluminum Foil ◽  
Thermonuclear Fusion ◽  
Uv Laser ◽  
Focusing Effect ◽  
Self Focusing

The peculiarities of light beam expansion in plasma upon irradiation of condensed targets with a powerful UV laser pulse are studied with the help of mathematical modeling. Experiments were carried out at the Lebedev Physical Institute of the Russian Academy of Sciences with the use of GARPUN installation: a powerful KrF laser that irradiated two-layer targets consisting of aluminum foil and a plexiglass layer. Channels stretched along the direction of incidence of the laser beam were found at the bottom of the crater. It was shown on the basis of experimental and calculated data that selffocusing of the laser beam developed in the plasma. As a result, hot spots were produced in vicinity of the plasma critical density, and fast (superthermal) electron flows were generated. The electron flows could produce the channels in the plexiglas. In order to describe the self-focusing effect a physicalmathematical model was developed, and “FOCUS” program was created at the Russian Technological University (MIREA). Numerical simulations were carried out on the gas-dynamic profiles (linear and exponential). It was shown that thermal self-focusing could develop at the conditions of “GARPUN” experiments (~ 1 mm longitudinal plasma, moderate radiation intensity: 1011–1012(W/cm2) × µm2).  The parameters of dangerous modes of laser beam perturbations were estimated. The interest in the experimental and mathematical modelling results is related to the laser thermonuclear fusion (LTF) research. Although Nd glass lasers are the basic installations for LTF research, UV gas eximer lasers have some advantages as drivers for future thermonuclear fusion reactors. The interaction of UV laser radiation with plasma has some peculiarities. Thus, developing physical-mathematical models and creating new programs required for the interpretation of modern UV laser – plasma coupling experiments and for the design of large scale facilities based on eximer drivers is a topical problem.

Propagation of a light beam in lithium niobate waveguide arrays: from discrete diffraction to discrete self-focusing

2005 ◽  
Author(s):  
Feng Chen ◽  
Detlef Kip ◽  
Vladimir Shandarov ◽  
Daniel Runde ◽  
Milutin Stepic ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Light Beam ◽  
Waveguide Arrays ◽  
Self Focusing ◽  
Discrete Diffraction

Resonant self-focusing of a cw intense light beam

1984 ◽  
Vol 29 (5) ◽  
pp. 2669-2676 ◽  
Author(s):  
Martine Le Berre ◽  
Elisabeth Ressayre ◽  
Andrée Tallet
Keyword(s):  
Light Beam ◽  
Self Focusing ◽  
Intense Light ◽  
Intense Light Beam

On the cubic and cubic-quintic optical vortices equations

2016 ◽  
Vol 22 (2) ◽  
Author(s):  
Carlo Greco
Keyword(s):  
Electromagnetic Field ◽  
Light Beam ◽  
Optical Field ◽  
The Self ◽  
Optical Vortices ◽  
Cubic Nonlinearity ◽  
Various Boundary Conditions ◽  
Self Focusing ◽  
Ring Shaped Structure ◽  
Point Type

AbstractAn optical vortex can appear when a light beam with nonzero angular momentum propagates in a suitable nonlinear medium. In some situations has been observed that the light intensity vanish at the center of the vortex (where the phase of the electromagnetic field is undefined), while the light beam assumes a ring-shaped structure. In this paper we consider two classical cases in which such kind of phenomena occur: the case of the self focusing cubic nonlinearity, and the case of competing quintic and cubic nonlinearity. In both cases we study the nonlinear Schrödinger equation of the optical field (with various boundary conditions) by means of min-max methods, and we prove the existence of saddle point type solutions, as well as minimum type solutions.

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