The analysis of the optimal two dimensional pump energy distribution for narrower electro-optically Q-switched pulse׳s width

2014 ◽  
Vol 332 ◽  
pp. 119-124
Author(s):  
Zilong Zhang ◽  
Qiang Liu ◽  
Mali Gong
Keyword(s):  
Energy Distribution ◽  
Pump Energy ◽  
Two Dimensional

Accelerating laser processes with a smart two-dimensional polygon mirror scanner for ultra-fast beam deflection

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Florian Roessler ◽  
André Streek
Keyword(s):  
Energy Distribution ◽  
Real Time ◽  
Laser Processing ◽  
High Speed ◽  
Beam Deflection ◽  
Two Dimensional ◽  
Heat Accumulation ◽  
Field Programmable ◽  
Drill Holes ◽  
Average Laser

Abstract In laser processing, the possible throughput is directly scaling with the available average laser power. To avoid unwanted thermal damage due to high pulse energy or heat accumulation during MHz-repetition rates, energy distribution over the workpiece is required. Polygon mirror scanners enable high deflection speeds and thus, a proper energy distribution within a short processing time. The requirements of laser micro processing with up to 10 kW average laser powers and high scan speeds up to 1000 m/s result in a 30 mm aperture two-dimensional polygon mirror scanner with a patented low-distortion mirror configuration. In combination with a field programmable gate array-based real-time logic, position-true high-accuracy laser switching is enabled for 2D, 2.5D, or 3D laser processing capable to drill holes in multi-pass ablation or engraving. A special developed real-time shifter module within the high-speed logic allows, in combination with external axis, the material processing on the fly and hence, processing of workpieces much larger than the scan field.

scholarly journals ENERGY DISTRIBUTION IN 2D STRINGY BLACK HOLE BACKGROUNDS

2003 ◽  
Vol 18 (31) ◽  
pp. 5781-5794 ◽  
Author(s):  
ELIAS C. VAGENAS
Keyword(s):  
Black Hole ◽  
Energy Distribution ◽  
Two Dimensional ◽  
Energy Distributions ◽  
Static Black Hole ◽  
Do So

We utilize Møller's and Einstein's energy–momentum complexes in order to explicitly evaluate the energy distributions associated with the two-dimensional "Schwarzschild" and "Reissner–Nordström" black hole backgrounds. While Møller's prescription provides meaningful physical results, Einstein's prescription fails to do so in the aforementioned gravitational backgrounds. These results hold for all two-dimensional static black hole geometries. The results obtained within this context are exploited in order that Seifert's hypothesis would be investigated.

Simulation on the Flow Field of Centrifugal Pump Based on Fluent

2014 ◽  
Vol 926-930 ◽  
pp. 1743-1746
Author(s):  
An Fu Guo ◽  
Tong Wang ◽  
Ting Ting Jiang ◽  
Yun Ping Hu ◽  
Da Jiang Zhang
Keyword(s):  
Kinetic Energy ◽  
Flow Field ◽  
Energy Distribution ◽  
Turbulent Kinetic Energy ◽  
Centrifugal Pump ◽  
Flow Distribution ◽  
Kinetic Energy Distribution ◽  
Two Dimensional ◽  
Two Dimensional Flow ◽  
Velocity Pressure

In this paper, the software Fluent was employed and the two-dimensional flow fields, such as flow distribution, velocity distribution, pressure distribution, turbulent kinetic energy distribution are obtained. The results show that the flow, velocity, pressure and turbulent kinetic energy distribution are significantly different and asymmetric. The results have referenced significance for design and analysis of the Centrifugal Pump.

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