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20 Dec 2013TL;DR: In this paper, a non-homogeneous laser beam with a smooth spatial distribution of energy across the beam profile is used to provide self-homogenization and to separate the layers of material.
Abstract: Laser lift off systems and methods overlap irradiation zones to provide multiple pulses of laser irradiation per location at the interface between layers of material to be separated. To overlap irradiation zones, the laser lift off systems and methods provide stepwise relative movement between a pulsed laser beam and a workpiece. The laser irradiation may be provided by a non-homogeneous laser beam with a smooth spatial distribution of energy across the beam profile. The pulses of laser irradiation from the non-homogenous beam may irradiate the overlapping irradiation zones such that each of the locations at the interface is exposed to different portions of the non-homogeneous beam for each of the multiple pulses of the laser irradiation, thereby resulting in self-homogenization. Thus, the number of the multiple pulses of laser irradiation per location is generally sufficient to provide the self-homogenization and to separate the layers of material.
11 citations
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TL;DR: Morel et al. as mentioned in this paper determined the age of the Abadla redbed's upper unit by using the autunian level of the Permian paleomagnetic data.
11 citations
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TL;DR: A connection between the algebra of rooted trees used in renormalization theory and Runge-Kutta methods is pointed out in this paper, where Butcher's group and B-series are shown to provide a suitable framework for renormalizing a toy model of field the ory.
Abstract: A connection between the algebra of rooted trees used in renormalization theory and Runge-Kutta methods is pointed out. Butcher's group and B-series are shown to provide a suitable framework for renormalizing a toy model of field the ory, following Kreimer's approach. Finally B-series are used to solve a class of non-linear partial differential equations.
11 citations
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TL;DR: In this paper, the authors report on two high-brightness CW devices: high-power module launching over 100W and a pump capable of launching 50W of wavelength-stabilized emission.
Abstract: Further acceptance and fiber lasers and direct diode systems commercial success greatly depend on diodes' availability
and cost ($/W). These two parameters should not compromise pumps' performance and reliability. We report on two
high-brightness CW devices: high-power module launching over 100W and a pump capable of launching 50W of
wavelength-stabilized emission. Devices are based on a single emitter platform and utilize a 105 μm core diameter fiber;
radiation is confined within NA<0.13 in both designs. These hermetically sealed modules require passive cooling and
are designed to operate with ≤ 30°C diodes' junction overheat. CW peak power efficiency is higher than 55% for both
devices. The 25-30dB isolation option (feedback protection at 10XX-nm) is optional in either package. Modules have
the industry's smallest footprint and are perfectly suited to serve pumping fiber lasers and direct materials processing
markets.
11 citations
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24 Sep 2014TL;DR: In this article, a beam delivery system that provides both the collimation and the dithering of a collimated laser as well as an adjustment of the beam diameter of the collimated beam is presented.
Abstract: Laser processing systems and methods are capable of moving a laser beam while maintaining consistent laser beam characteristics at processing locations. The laser processing systems generate a collimated laser beam having a consistent Z axis power density along at least a portion of a length of the laser beam and dither the collimated laser beam along one of the X and Y axes. The dithering of the collimated laser beam facilitates consistent laser processing on a three-dimensional surface, for example, to provide consistent deposition of a coating in a laser cladding process. A laser processing system may include a beam delivery system that provides both the collimation and the dithering of the collimated laser as well as an adjustment of the beam diameter of the collimated beam.
11 citations
Authors
Showing all 903 results
Name | H-index | Papers | Citations |
---|---|---|---|
Claude J. Allègre | 106 | 327 | 35092 |
Paul Tapponnier | 99 | 294 | 42855 |
Francesco Mauri | 85 | 352 | 69332 |
Barbara Romanowicz | 67 | 284 | 14950 |
Geoffrey C. P. King | 64 | 157 | 17177 |
Yi-Gang Xu | 64 | 271 | 14292 |
Jérôme Gaillardet | 63 | 199 | 14878 |
François Guyot | 61 | 292 | 12444 |
Georges Calas | 60 | 266 | 10901 |
Ari P. Seitsonen | 59 | 212 | 45684 |
Michele Lazzeri | 58 | 140 | 57079 |
Bernard Bourdon | 58 | 118 | 9962 |
Gianreto Manatschal | 56 | 200 | 10063 |
Nikolai M. Shapiro | 56 | 154 | 15508 |
Guillaume Morin | 55 | 156 | 7218 |