Topological depolarization of laser radiation in multimodal step-index fibers with square cross section

1992 ◽  
Vol 35 (10) ◽  
pp. 1152-1154
Author(s):  
A. V. Volyar
Keyword(s):  
Laser Radiation ◽  
Cross Section ◽  
Step Index

Analysis of the spatial energy distribution in the cross section of a laser radiation beam

1983 ◽  
Vol 26 (2) ◽  
pp. 109-111 ◽  
Author(s):  
N. A. Kolhanovskaya ◽  
A. F. Kotyuk ◽  
A. M. Raitsin
Keyword(s):  
Laser Radiation ◽  
Energy Distribution ◽  
Cross Section ◽  
Radiation Beam ◽  
The Cross

scholarly journals On improving the efficiency of blasting operations in underground and open-pit mining

2019 ◽  
Vol 123 ◽  
pp. 01020
Author(s):  
Oleksii Kyrychenko ◽  
Anton Kurliak ◽  
Oleh Balakin ◽  
Oleksandr Baskevych
Keyword(s):  
Mathematical Modeling ◽  
Laser Radiation ◽  
Elastic Scattering ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Open Pit ◽  
Lead Azide ◽  
Laser Initiation ◽  
Absorption Cross ◽  
Technical Specifications

The purpose is to study the effect of microstructure defects of initiating explosives on the process of initiating detonation by a laser monopulse. The results of experimental studies and physico-mathematical modeling of the effect of microstructural defects in crystals of photosensitive initiating explosives under the action of a single laser pulse are given. The paper covers a brief analysis of the history of the issue being studied and physico-mathematical modeling using the theory of elastic scattering, i.e. Gustav Mie theory. The technique for determining the absorption cross section of laser radiation by micro-sized inclusions of explosive has been developed and tested. In experiments on explosives ignition using a laser monopulse, the laser monopulse shape was recorded, the energy distribution over the laser beam radius and the explosive ignition delay time were controlled. The basis is the proposed method of calculating the absorption cross section and intensity in terms of the laser radiation wavelength by the inclusion of an explosive with using the theory of elastic scattering of optical radiation on particles in micrometer size range. It is shown that the absorption properties of the particle essentially depend on the properties of the particle medium and the wavelength of radiation. For smoke particle within PETN the absorption for wavelength of laser radiation of 1.06 μm is stronger than for that of 0.69 μm. A different absorption occurs if a lead particle is within a lead azide: absorption for wavelength of 0.69 μm is twice as strong as for wavelength of 1.06 μm. During the manufacture of explosives the additional defects in the explosives microstructure are desired to be created to increase the efficiency of laser initiation. Findings are used in the development of technical specifications for the design of optical detonators for laser initiation systems.

scholarly journals Formation of a waveguide having the ultimately small cross-section due to self-consistent propagation of a highly intensive laser beam (1018 W/cm2) with duration of 100 ps in an overdense plasma

1999 ◽  
Vol 17 (3) ◽  
pp. 391-394
Author(s):  
G.G. KOCHEMASOV ◽  
L.S. MKHITARYAN ◽  
B.A. VOINOV
Keyword(s):  
Laser Radiation ◽  
Laser Beam ◽  
Cross Section ◽  
Ponderomotive Force ◽  
Initial Density ◽  
Small Cross Section ◽  
Helmholtz Equations ◽  
Laser Radiation Pulse ◽  
Overdense Plasma ◽  
Fluid Hydrodynamics

Here we study the problem of a focused laser beam propagation in plasma with the initial density, which is much higher than the critical one. The Helmholtz equations, together with the equations of single fluid hydrodynamics, with the relativistic ponderomotive force were solved. It was shown that the stable waveguide with the cross-section of wavelength size was formed when plasma was affected by the laser radiation with the intensity exceeding the critical one while the laser radiation pulse was as long as (10–100) ps.

Cross section of supercooled238UF6 in multiphoton absorption induced by 16 micrometer Raman-laser radiation

1994 ◽  
Vol 59 (4) ◽  
pp. 475-477 ◽  
Author(s):  
Y. Okada ◽  
Y. Kuga ◽  
K. Sunouchi ◽  
S. Satooka ◽  
S. Isomura ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Cross Section ◽  
Raman Laser ◽  
Multiphoton Absorption

Variation of the absorption cross section of high-power infrared laser radiation in homologous series of CnH2n+1OH molecules

1984 ◽  
Vol 14 (11) ◽  
pp. 1536-1541
Author(s):  
Viktor N Bagratashvili ◽  
E A Brodskaya ◽  
Lyudmila N Vereshchagina ◽  
M V Kuz'min ◽  
R R Osmanov ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Cross Section ◽  
High Power ◽  
Absorption Cross Section ◽  
Homologous Series ◽  
Infrared Laser ◽  
Absorption Cross
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