scholarly journals The spatial energy distribution and the spectrum characteristics in a two-dimensional random medium

2008 ◽  
Vol 57 (9) ◽  
pp. 5550
Author(s):  
Wang Hui-Qin ◽  
Liu Zheng-Dong ◽  
Wang Bing
Keyword(s):  
Energy Distribution ◽  
Random Medium ◽  
Two Dimensional ◽  
Spectrum Characteristics

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.

The competition between two polarization states in two-dimensional random medium

2008 ◽  
Vol 281 (10) ◽  
pp. 2964-2969 ◽  
Author(s):  
Hai Liu ◽  
Jinsong Liu ◽  
Bo Feng ◽  
Qingquan Zhang ◽  
Jiantao Lü ◽  
...  
Keyword(s):  
Random Medium ◽  
Two Dimensional ◽  
Polarization States

Characteristic of Polarized Modes under Local Pumping in Two-Dimensional Random Medium

2011 ◽  
Vol 48 (7) ◽  
pp. 071407
Author(s):  
刘海 Liu Hai ◽  
靳慧 Jin Hui ◽  
吕健滔 Lü Jiantao ◽  
张祥军 Zhang Xiangjun ◽  
任子晖 Ren Zihui
Keyword(s):  
Random Medium ◽  
Two Dimensional

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.

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