Reconstruction of the radial dependence of the structural characteristic of the refractive index in a supersonic gas flow from laser beam intensity fluctuations

2010 ◽  
Vol 108 (1) ◽  
pp. 117-122 ◽  
Author(s):  
V. A. Banakh ◽  
D. A. Marakasov ◽  
A. A. Sukharev
Keyword(s):  
Refractive Index ◽  
Laser Beam ◽  
Structural Characteristic ◽  
Gas Flow ◽  
Beam Intensity ◽  
Radial Dependence ◽  
Laser Beam Intensity ◽  
Supersonic Gas Flow ◽  
Intensity Fluctuations

scholarly journals Ultrafast carbothermal reduction of silica to silicon using a CO2 laser beam

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Seok-Ho Maeng ◽  
Hakju Lee ◽  
Min Soo Park ◽  
Suhyun Park ◽  
Jaeki Jeong ◽  
...  
Keyword(s):  
Carbon Black ◽  
Laser Beam ◽  
Carbothermal Reduction ◽  
Gas Flow ◽  
Crystalline Silicon ◽  
Reduction Process ◽  
Reaction Chamber ◽  
Raman Shift ◽  
Influence Of Process Parameters ◽  
Laser Beam Intensity

AbstractWe report the extraction of silicon via a carbothermal reduction process using a CO2 laser beam as a heat source. The surface of a mixture of silica and carbon black powder became brown after laser beam irradiation for a few tens of seconds, and clear peaks of crystalline silicon were observed by Raman shift measurements, confirming the successful carbothermal reduction of silica. The influence of process parameters, including the laser beam intensity, radiation time, nitrogen gas flow in a reaction chamber, and the molar ratios of silica/carbon black of the mixture, on the carbothermal reduction process is explained in detail.

Influence of Thermal Deformations in the Solid Laser Medium on the Emitted Radiation Parameters

2005 ◽  
Vol 219 (8) ◽  
pp. 823-827
Author(s):  
O Donţu ◽  
S Ganatsios ◽  
D Duminica
Keyword(s):  
Laser Beam ◽  
Radial Distribution ◽  
Thermal Deformation ◽  
Processing Parameters ◽  
Beam Intensity ◽  
Laser Medium ◽  
Laser Beam Intensity ◽  
Active Laser ◽  
Thermal Deformations ◽  
Active Laser Medium

The paper presents some remarks about the way in which the thermal deformation in the solid active laser medium influences the radial distribution of the emitted laser beam intensity, implicitly the processing parameters.

Relativistic self-focusing of a rippled laser beam in a plasma

1999 ◽  
Vol 62 (4) ◽  
pp. 389-396 ◽  
Author(s):  
M. V. ASTHANA ◽  
A. GIULIETTI ◽  
DINESH VARSHNEY ◽  
M. S. SODHA
Keyword(s):  
Refractive Index ◽  
Laser Beam ◽  
The Self ◽  
Laser Beams ◽  
Radial Dependence ◽  
Main Beam ◽  
Gaussian Laser Beam ◽  
Self Focusing ◽  
Saturation Effects ◽  
Paraxial Ray

This paper presents an analysis of the relativistic self-focusing of a rippled Gaussian laser beam in a plasma. Considering the nonlinearity as arising owing to relativistic variation of mass, and following the WKB and paraxial-ray approximations, the phenomenon of self-focusing of rippled laser beams is studied for arbitrary magnitude of nonlinearity. Pandey et al. [Phys. Fluids82, 1221 (1990)] have shown that a small ripple on the axis of the main beam grows very rapidly with distance of propagation as compared with the self-focusing of the main beam. Based on this analogy, we have analysed relativistic self-focusing of rippled beams in plasmas. The relativistic intensities with saturation effects of nonlinearity allow the nonlinear refractive index in the paraxial regime to have a slower radial dependence, and thus the ripple extracts relatively less energy from its neighbourhood.

Wiggler smoothing of laser beam intensity at ICF target surface

1995 ◽  
Author(s):  
I. P. Bashkatov ◽  
A. Y. Goltsov ◽  
A. N. Kolomiyskii ◽  
N. G. Kovalskii ◽  
V. V. Kryzhko ◽  
...  
Keyword(s):  
Laser Beam ◽  
Target Surface ◽  
Beam Intensity ◽  
Laser Beam Intensity ◽  
Icf Target

Optimum control of the laser beam intensity profile with a deformable mirror

1997 ◽  
Vol 36 (30) ◽  
pp. 7689 ◽  
Author(s):  
Koshichi Nemoto ◽  
Takuya Nayuki ◽  
Takashi Fujii ◽  
Naohiko Goto ◽  
Yoshi-kazu Kanai
Keyword(s):  
Laser Beam ◽  
Intensity Profile ◽  
Beam Intensity ◽  
Deformable Mirror ◽  
Optimum Control ◽  
Laser Beam Intensity
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