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 ◽  
...  
2013 ◽  
Vol 467 ◽  
pp. 227-232 ◽  
Author(s):  
Imed Miraoui ◽  
Mouna Zaied ◽  
Mohamed Boujelbene

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.


2014 ◽  
Vol 974 ◽  
pp. 169-173 ◽  
Author(s):  
Imed Miraoui ◽  
Mohamed Boujelbene ◽  
Emin Bayraktar

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.


1992 ◽  
Vol 90 (3) ◽  
pp. 545
Author(s):  
David B. Apfelberg ◽  
r Keijze ◽  
J. W Pickering ◽  
Gemert van

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

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

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 ◽  
...  

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