The interaction of high-intensity picosecond lasers with matter has attracted great interest beca... more The interaction of high-intensity picosecond lasers with matter has attracted great interest because of its potential as a source of picosecond x-ray pulses, an application for acceleration of relativistic particles by laser light, as well as for laser fusion. Despite a relatively large amount of investigations of laser-plasma interaction there is a lack of data on the spatial and temporal charge density distribution at focus of an intense laser pulse during its propagation in plasma. In this paper we report direct measurement of density profiles in the focal region of the ps-laser beam by means of transverse holographic interferometry and transverse absorption photography. A high intensity IR pulse (60 mJ, 100 ps, 1064 nm) from Nd:YAG laser was focused by a 25 cm focal length lens to a maximum intensity of 5{center_dot}10{sup 13} W/cm{sup 2}. The laser beam (s-polarized) was incident normal on the planar Al target in air. The target was placed in one arm of Michelson interferometer...
IEEE International Conference on Electro/Information Technology, 2014
ABSTRACT Certain problems encountered in electrical engineering incur an exponential time complex... more ABSTRACT Certain problems encountered in electrical engineering incur an exponential time complexity and are therefore impossible to solve exactly for all problem sizes. However, heuristical approaches can sometimes use exact solutions of small instances of a problem to formulate a suboptimal solution to a larger instance of the problem. This paper demonstrates how to use the Unrank algorithm to solve small instances of several NP-hard problems (3-SAT, Maximum Clique and Graph Coloring) on a Graphical Processing Unit.
We examine the effect of pyridine on phase Q in macromolecular organic matter in chondrites Krymk... more We examine the effect of pyridine on phase Q in macromolecular organic matter in chondrites Krymka and Vigarano. Our results show no Q-gas loss. Such loss has been found in Orgueil, although attribute this to presolar grain loss.
The interaction of high-intensity picosecond lasers with matter has attracted great interest beca... more The interaction of high-intensity picosecond lasers with matter has attracted great interest because of its potential as a source of picosecond x-ray pulses, an application for acceleration of relativistic particles by laser light, as well as for laser fusion. Despite a relatively large amount of investigations of laser-plasma interaction there is a lack of data on the spatial and temporal charge density distribution at focus of an intense laser pulse during its propagation in plasma. In this paper we report direct measurement of density profiles in the focal region of the ps-laser beam by means of transverse holographic interferometry and transverse absorption photography. A high intensity IR pulse (60 mJ, 100 ps, 1064 nm) from Nd:YAG laser was focused by a 25 cm focal length lens to a maximum intensity of 5{center_dot}10{sup 13} W/cm{sup 2}. The laser beam (s-polarized) was incident normal on the planar Al target in air. The target was placed in one arm of Michelson interferometer...
IEEE International Conference on Electro/Information Technology, 2014
ABSTRACT Certain problems encountered in electrical engineering incur an exponential time complex... more ABSTRACT Certain problems encountered in electrical engineering incur an exponential time complexity and are therefore impossible to solve exactly for all problem sizes. However, heuristical approaches can sometimes use exact solutions of small instances of a problem to formulate a suboptimal solution to a larger instance of the problem. This paper demonstrates how to use the Unrank algorithm to solve small instances of several NP-hard problems (3-SAT, Maximum Clique and Graph Coloring) on a Graphical Processing Unit.
We examine the effect of pyridine on phase Q in macromolecular organic matter in chondrites Krymk... more We examine the effect of pyridine on phase Q in macromolecular organic matter in chondrites Krymka and Vigarano. Our results show no Q-gas loss. Such loss has been found in Orgueil, although attribute this to presolar grain loss.
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Papers by Nicholas Vogel