scholarly journals Toward high laser power beam manipulation with nanophotonic materials: evaluating thin film damage performance

2021 ◽  
Vol 29 (5) ◽  
pp. 7261
Author(s):  
T. U. Tumkur ◽  
R. Sokhoyan ◽  
M. P. Su ◽  
A. Ceballos-Sanchez ◽  
G. Kafaie Shirmanesh ◽  
...  
Keyword(s):  
Thin Film ◽  
Laser Power ◽  
High Laser Power ◽  
High Laser ◽  
Beam Manipulation

scholarly journals The Big Bang Observer: High laser power for gravitational wave astrophysics

2007 ◽  
Author(s):  
Gregory M Harry ◽  
Peter Fritschel ◽  
William Folkner ◽  
Daniel A Shaddock ◽  
E Sterl Phinney
Keyword(s):  
Gravitational Wave ◽  
Laser Power ◽  
Big Bang ◽  
High Laser Power ◽  
High Laser ◽  
The Big Bang

Reduced Absorption of Light at High Laser Power Densities

Nature ◽  
1965 ◽  
Vol 207 (4995) ◽  
pp. 399-400 ◽  
Author(s):  
HUBERTUS STAERK ◽  
GEORG CZERLINSKI
Keyword(s):  
Laser Power ◽  
High Laser Power ◽  
High Laser ◽  
Absorption Of Light ◽  
Power Densities

Selective laser melting of Inconel 718 under high laser power

2020 ◽  
Vol 30 ◽  
pp. 784-788
Author(s):  
E.V. Borisov ◽  
V.A. Popovich ◽  
A.A. Popovich ◽  
V.Sh. Sufiiarov ◽  
Jia-Ning Zhu ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Inconel 718 ◽  
Laser Power ◽  
Laser Melting ◽  
High Laser Power ◽  
High Laser

Multi-color resonance ionization of laser ablated gadolinium at high laser power

2005 ◽  
Vol 256 (4-6) ◽  
pp. 364-372 ◽  
Author(s):  
J. Maul ◽  
K. Eberhardt ◽  
G. Huber ◽  
S. Karpuk ◽  
G. Passler ◽  
...  
Keyword(s):  
Laser Power ◽  
Resonance Ionization ◽  
High Laser Power ◽  
High Laser

scholarly journals Micro-Raman Study of Thermal Transformations of Sulfide and Oxysalt Minerals Based on the Heat Induced by Laser

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 751 ◽  
Author(s):  
Xi ◽  
Zhang ◽  
Luan ◽  
Du ◽  
Li ◽  
...  
Keyword(s):  
Laser Power ◽  
Energy Difference ◽  
Local Heat ◽  
Cold Seep ◽  
Thermal Transformations ◽  
Orbital Theory ◽  
High Laser Power ◽  
Aragonite Crystal ◽  
High Laser ◽  
Different Temperatures

The minerals in the hydrothermal and cold seep system form at different temperatures and show responses to the laser power to varying degrees. Here, we focus on the heat-induced by laser to study thermal transformations of the chalcopyrite, covellite, pyrite, barite, and aragonite based on Raman spectroscopy. Chalcopyrite mainly transforms into hematite, and covellite mainly transforms into chalcocite with the increase of laser power. Interestingly, comparing with the previous study, the pyrite can transform to the marcasite firstly, and form hematite finally. We also find that high-temperature opaque chalcopyrite is more likely to occur thermal transformations due to the smaller absolute energy difference (|ΔE1|) based on the frontier orbital theory. In contrast, the oxysalt minerals won’t transform into new components under high laser power. However, the structure of the barite has been destroyed by the high laser power, while the more transparent aragonite is not affected by the high laser power due to the laser penetrates through the transparent aragonite crystal and causes little heat absorption. Finally, we established the minimum laser power densities for thermal transformations of these minerals formed under different environments. The above study provides a simple way to study the thermal transformations of minerals by the local heat-induced by laser and also enlightens us to identify the minerals phases precisely.

Establishing the Optimal Process Parameters for the Laser Sintering of Ti64 for Layer Thicknesses of 15 μm and 30 μm and Validation of a Melt Pool Simulation Model

2014 ◽  
Vol 1019 ◽  
pp. 254-258 ◽  
Author(s):  
Johan Els ◽  
Michele Truscott ◽  
Kobus van der Walt ◽  
Gerrie Booysen
Keyword(s):  
Computer Aided Design ◽  
Laser Power ◽  
Scanning Speed ◽  
Laser Sintering ◽  
Layer By Layer ◽  
Track Width ◽  
Melt Pool ◽  
High Laser Power ◽  
High Laser

Direct Metal Laser Sintering (DMLS) is a layer-by-layer Additive Manufacturing (AM) process that creates physical metal parts from three dimensional Computer Aided Design (CAD) data. For DMLS to be generally accepted by industry as a manufacturing technology, high mechanical integrity of final components needs to be demonstrated. Mechanical properties of manufactured components are directly affected by the quality of each individual laser sintered track of each consecutive layer. In this study, the optimal ratio of laser power and scanning speed on single tracks is determined for Titanium-6Al-4V powder on an EOSINT M270 DMLS machine for a layer thickness that varies between 15 μm and 30 μm. Two different laser powers, namely 150 W and 170 W were considered. Scanning speeds varied between 600 mm/s to 2000 mm/s with 200 mm/s intervals. The most stable tracks resulted from high laser power, slow scanning speed and thin powder distribution. The empirical data were compared to a melt pool width prediction program, which was found to underestimate track width at all scanning speeds and re-melting depth at low scanning speeds. Further, it was found that decreased powder thickness can be used with an increased scanning speed and high laser power. This strategy may be used to increase surface quality. The penetration data during fusion of the tracks onto the building platform further validates the quality of each sintered track.

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