scholarly journals Design and optimization of a highly efficient optical multipass system forγ-ray beam production from electron laser beam Compton scattering

2014 ◽  
Vol 17 (3) ◽  
Author(s):  
K. Dupraz ◽  
K. Cassou ◽  
N. Delerue ◽  
P. Fichot ◽  
A. Martens ◽  
...  
Keyword(s):  
Laser Beam ◽  
Compton Scattering ◽  
Design And Optimization ◽  
Highly Efficient ◽  
Beam Production

Highly efficient terahertz wave filter for high-power laser beam separation

2014 ◽  
Vol 105 (22) ◽  
pp. 221108 ◽  
Author(s):  
Bo Guo ◽  
Jun Tang ◽  
Bin Cai ◽  
YiMing Zhu
Keyword(s):  
Laser Beam ◽  
High Power ◽  
Terahertz Wave ◽  
High Power Laser ◽  
Power Laser ◽  
Highly Efficient ◽  
Wave Filter

scholarly journals Process Window for Highly Efficient Laser-Based Powder Bed Fusion of AlSi10Mg with Reduced Pore Formation

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5255
Author(s):  
Artur Leis ◽  
Rudolf Weber ◽  
Thomas Graf
Keyword(s):  
Laser Beam ◽  
Process Efficiency ◽  
Process Window ◽  
Deep Penetration ◽  
Optimum Process ◽  
Beam Diameter ◽  
Powder Bed Fusion ◽  
Powder Bed ◽  
Highly Efficient ◽  
Low Porosity

The process window for highly efficient laser-based powder bed fusion (LPBF), ensuring the production of parts with low porosity, was determined by analyzing cross-sections of samples that were generated with laser powers varying between 10.8 W and 1754 W, laser beam diameters varying between 35 μm and 200 μm, and velocities of the moving laser beam ranging between 0.7 m/s and 1.3 m/s. With these parameters, the process alters between different modes that are referred to as simple heating, heat conduction melting (HCM), key-bowl melting (KBM), and deep-penetration melting (DPM). It was found that the optimum process window for a highly efficient LPBF process, generating AlSi10Mg parts with low porosity, is determined by the ratio PL/db of the incident laser power PL and the beam diameter db of the beam on the surface of the bead, and ranges between PL/db = 2000 W/mm and PL/db = 5200 W/mm, showing process efficiencies of about 7–8%. This optimum process window is centered around the range PL/db = 3000–3500 W/mm, in which the process is characterized by KBM, which is an intermediate process mode between HCM and DPM. Processes with PL/db < 2000 W/mm partially failed, and lead to balling and a lack of fusion, whereas processes with PL/db > 5200 W/mm showed a process efficiency below 5% and pore ratios exceeding 10%.

scholarly journals Frequency-modulated laser beam with highly efficient intensity stabilisation

2005 ◽  
Vol 41 (4) ◽  
pp. 188 ◽  
Author(s):  
F. du Burck ◽  
A. Tabet ◽  
O. Lopez
Keyword(s):  
Laser Beam ◽  
Highly Efficient

scholarly journals Production of gamma rays by pulsed laser beam Compton scattering off GeV-electrons using a non-planar four-mirror optical cavity

2012 ◽  
Vol 7 (01) ◽  
pp. P01021-P01021 ◽  
Author(s):  
T Akagi ◽  
S Araki ◽  
J Bonis ◽  
I Chaikovska ◽  
R Chiche ◽  
...  
Keyword(s):  
Laser Beam ◽  
Compton Scattering ◽  
Gamma Rays ◽  
Optical Cavity ◽  
Pulsed Laser ◽  
Pulsed Laser Beam

Fine diagnostic of laser-created plasmas by induced Compton scattering

1978 ◽  
Vol 19 (3) ◽  
pp. 349-353 ◽  
Author(s):  
Carlos Montes ◽  
Jean Peyraud
Keyword(s):  
Distribution Function ◽  
Laser Beam ◽  
Compton Scattering ◽  
Incident Angle ◽  
Occupation Numbers ◽  
Plasma Distribution

Laser-created plasmas are characterized by high photon occupation numbers. Analysis of the induced Compton scattering of an auxiliary laser beam, tunable in frequency and incident angle, is used as a fine diagnostic mechanism for measuring the subcritical plasma distribution function.

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