The Effect of Atmosphere Disturbances on Laser Beam Propagation

2012 ◽  
Vol 500 ◽  
pp. 3-8 ◽  
Author(s):  
Seyed Hamid Hashemipour ◽  
A. Salman Ogli ◽  
Nasim Mohammadian
Keyword(s):  
Laser Beam ◽  
Average Intensity ◽  
Beam Diameter ◽  
Propagation Characteristics ◽  
Laser Beam Diameter ◽  
Blooming Effect ◽  
Thermal Blooming ◽  
Propagation Axis ◽  
Video Format ◽  
Peak Value

In this article, we probe the atmosphere disturbance such as Attenuation, Scattering, turbulence and thermal blooming on the laser beam propagated it. For investigating, we designed software which gives the vertically propagation characteristics of a general-type beam in atmosphere, based on the Huygens–Fresnel principle. When the required source and medium parameters are entered, the simulator yields the average intensity profile along the propagation axis in a video format. The results show that the peak value of the average intensity can be astonishingly affected by atmospheric turbulence, thermal blooming effect (for typical high power lasers) and the laser beam diameter.

Effect of Laser Beam Diameter on Cut Edge of Steel Plates Obtained by Laser Machining

2013 ◽  
Vol 467 ◽  
pp. 227-232 ◽  
Author(s):  
Imed Miraoui ◽  
Mouna Zaied ◽  
Mohamed Boujelbene
Keyword(s):  
Laser Beam ◽  
Laser Cutting ◽  
Steel Plates ◽  
Beam Diameter ◽  
Power Laser ◽  
Laser Beam Diameter ◽  
Machined Surface ◽  
Cut Edge ◽  
Thermal Influence ◽  
Cut Surface

Laser cutting is a thermal process which is used contactless to separate materials. In the present study, high-power laser cutting of steel plates is considered and the thermal influence of laser cutting on the cut edges is examined. The microstructure and the microhardness of the cut edge are affected by the input laser cutting parameter: laser beam diameter. The aim of this work is to investigate the effect of the laser beam diameter on the microhardness beneath the cut surface of steel plates obtained by CO2 laser cutting. The cut surface was studied based on microhardness depth profiles beneath the machined surface. The results show that laser cutting has a thermal effect on the surface microstructure and on the microhardness beneath the cut section. Also the microhardness of the hardening zone depends on the laser beam diameter.

Analysis of Roughness and Heat Affected Zone of Steel Plates Obtained by Laser Cutting

2014 ◽  
Vol 974 ◽  
pp. 169-173 ◽  
Author(s):  
Imed Miraoui ◽  
Mohamed Boujelbene ◽  
Emin Bayraktar
Keyword(s):  
Surface Roughness ◽  
Laser Beam ◽  
Heat Affected Zone ◽  
Laser Power ◽  
Laser Cutting ◽  
Major Effect ◽  
Steel Plates ◽  
Beam Diameter ◽  
Laser Beam Diameter ◽  
Cut Surface

In the present study, high-power CO2 laser cutting of steel plates has been investigated and the effect of the input laser cutting parameters on the cut surface quality is analyzed. The average roughness of the cut surface of the specimens, produced by different laser beam diameter and laser power, were measured by using roughness tester. The scanning electron microscopy SEM is used to record possible metallurgical alterations on the cut edge. The aim of this work is to investigate the effect of laser beam diameter and laser power on the cut surface roughness and on the heat affected zone width HAZ of steel plates obtained by CO2 laser cutting. An overall optimization was applied to find out the optimal cutting setting that would improve the cut surface quality. It was found that laser beam diameter has a negligible effect on surface roughness but laser power had major effect on roughness. The cut surface roughness decreases as laser power increases. Improved surface roughness can be obtained at higher laser power. Also, laser beam diameter and laser power had major effect on HAZ width. It increases as laser power increases.

Thermal Blooming Effect of Flat-Topped Laser Beam Array Propagating Through Atmosphere

2019 ◽  
Vol 39 (1) ◽  
pp. 0126020
Author(s):  
李晓庆 Li Xiaoqing ◽  
曹建勇 Cao Jianyong ◽  
丁洲林 Ding Zhoulin ◽  
季小玲 Ji Xiaoling
Keyword(s):  
Laser Beam ◽  
Blooming Effect ◽  
Beam Array ◽  
Thermal Blooming

J. C. Laser beam diameter for port wine stain treatment

1992 ◽  
Vol 90 (3) ◽  
pp. 545
Author(s):  
David B. Apfelberg ◽  
r Keijze ◽  
J. W Pickering ◽  
Gemert van
Keyword(s):  
Laser Beam ◽  
Beam Diameter ◽  
Port Wine Stain ◽  
Port Wine ◽  
Laser Beam Diameter

Effects of laser beam diameter on electromagnetically induced transparency due to Zeeman coherences in Rb vapor

2013 ◽  
Vol T157 ◽  
pp. 014019
Author(s):  
S N Nikolić ◽  
A J Krmpot ◽  
N M Lučić ◽  
B V Zlatković ◽  
M Radonjić ◽  
...  
Keyword(s):  
Laser Beam ◽  
Electromagnetically Induced Transparency ◽  
Beam Diameter ◽  
Laser Beam Diameter ◽  
Rb Vapor ◽  
Induced Transparency

Dependence of the alignment characteristics using moire signals on the laser beam diameter

2000 ◽  
Vol 2000.2 (0) ◽  
pp. 189-190
Author(s):  
Akihito Matsuo ◽  
Masayuki Uchida ◽  
Hideo Furuhashi ◽  
Yoshiyuki Uchida
Keyword(s):  
Laser Beam ◽  
Beam Diameter ◽  
Laser Beam Diameter

Two methods for measuring laser beam diameter

2010 ◽  
Vol 22 (4) ◽  
pp. 132-136 ◽  
Author(s):  
Wesley J. Marshall
Keyword(s):  
Laser Beam ◽  
Beam Diameter ◽  
Laser Beam Diameter

Laser-beam diameter measurement using periodic logarithmic grating

1991 ◽  
Vol 4 (10) ◽  
pp. 395-397
Author(s):  
A. A. S. Awwal ◽  
D. R. Klemer ◽  
T. A. Birt ◽  
M. R. Vallapareddy ◽  
C. G. Kurek ◽  
...  
Keyword(s):  
Laser Beam ◽  
Beam Diameter ◽  
Diameter Measurement ◽  
Laser Beam Diameter
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