IPG Photonics

About: IPG Photonics is a based out in . It is known for research contribution in the topics: Laser & Fiber laser. The organization has 903 authors who have published 1241 publications receiving 63339 citations.

Volcanomagnetic variations related to the seismic crisis that occurred from December 1985 through May 1986 on the Montagne Pelee, Martinique (Lesser Antilles).

Abstract: Since 1985, a magnetic network of telemetered stations is settled on the Montagne Pelee volcanic massif of the Martinique island. Until December 1985, at which date the initial volcanic seisms are recorded, the simultaneous variations in the differences of Earth's magnetic field intensity between two stations located on the volcano and a reference station which is 9km distant from them remain constant to within 1nT. During the seismic crisis, which ends in May 1986, over twenty shallow earthquakes are sensed within 2km below the summit, and volcanomagnetic variations of small amplitudes never exceeding 3nT can be observed. The onset of the seismic crisis that occurred in December 1985-January 1986 is primarily expressed by a slow irreversible increase of the differences, whereas partly reversible volcanomagnetic variations are observed with the last seisms in May.

Multple-laser distinct wavelengths and pulse durations processing

Abstract: Multiple-beam laser processing may be performed on a workpiece using at least first and second laser beams with different characteristics (e.g., wavelengths and/or pulse durations). In some applications, an assist laser beam is directed at a target location on or within the workpiece to modify a property of the non-absorptive material. A process laser beam is directed at the target location and is coupled into absorption centers formed in the non-absorptive material to complete processing of the non-absorptive material. Multiple-beam laser processing may be used, for example, to drill holes in a substrate made of alumina or other transparent ceramics. In other applications, multiple-beam laser processing may be used in melting applications such as micro-welding, soldering, and forming laser fired contacts. In these applications, the assist laser beam may be used to modify a property of the material or to change the geometry of the parts.

Performing submarine field survey without scuba gear using GIS-like mapping in a Virtual Reality environment

Abstract: Geomorphological and geological studies of the seafloor benefit today from both ROV exploration and from acquisition of high resolution bathymetric data. Although both represent significant improvements to study submarine domains, the understanding of the studied objects is made more difficult than on land given the limited visual perception provided by the ROV camera due to the attenuation of light in the water and the need to use artificial illumination. Likewise, mapping can be performed using GIS software for digital elevation models and its derivatives (e.g. slope or shade raster), mostly in a 2D map view only. So, the submarine studies lack the field survey stage performed in classical onshore works that allows clear visualization and appreciation of the studied objects.Our aim is to develop a solution allowing the visualization of Digital Elevation Models (DEM) and 3D models derived from Structure-from-Motion (SfM) within a virtual reality environment, and to use these data for geomorphological and geological analysis. For this, we use an Oculus Rift headset, Touch controllers, and the Unity game engine, with GIS-like interaction capabilities.The free and open Unity package that we are developing allows, at this stage, data visualization and working at a 1:1 scale in a georeferenced system. The user can therefore move freely within a 3D immersive environment that includes custom topographic data. For quantitative observations, we develop tools (ruler, compass) allowing measurements similar to those performed during geomorphological or geological field work. We also add the possibility to map objects. Digitizing in 3D is achieved with a laser pointed towards the data, providing great precision. The user can thus create pseudo shapefiles using the same three graphic primitives, and that are compatible with standard GIS software. Beside these functionalities, we also implement a spatial user interface displaying help and information and a teleportation tool preventing motion sickness.The users that have tested this solution are enthusiastic and agree that it helps to better appreciate and understand the shape and geometry of the studied objects. It was also used to present and explain 3D models of outcrops to master students. Further developments will port the solution for other headsets, facilitate the data import (e.g., standard file formats for 3D objects and DEMs), create and manage of multiple layers of shapefiles, and include multiplayer online gaming capabilities to allow remote co-working with colleague(s) at other distant locations, or a whole classroom.

Inhomogeneous distribution of Cr impurities in α–Al2O3 during refractory aging

Abstract: Aged alumina refractories have been investigated by EPR (Electron Paramagnetic Resonance) and EPMA (Electron Probe Micro-Analysis). EPMA shows that Cr is homogeneously distributed inside the corundum grains within spatial resolution (1 μm). Cr3+ concentration at the atomic scale is obtained by EPR by the magnitude of dipolar broadening due to Cr-Cr interactions. This local concentration appears to be systematically higher (up to a factor of 10) than the average chromium content of the corundum crystals determined by EPMA. Cr3+ ions may be preferentially concentrated at the vicinity of extended lattice defects which help in accommodating the lattice strain due to the size difference between Al3+ and Cr3+ cations. A random location of these defects explains the apparent homogeneous chromium distribution found by EPMA in these aged refractories.

Beam Combiner and Distributor System and Method Therefore

Abstract: The present invention relates to a fiber laser system for processing materials involving a system of interconnected operational components for combining and optionally distributing beams from multiple beam emitters. More particularly, the present invention provides a system for combining and distributing fiber laser beams having different wavelengths and a method for operating the system thereof. Multiple beam combiners may be optionally linked with a beam distribution system. In exemplary use, multiple fiber laser sources generating different wavelength outputs are combined in a single beam incident of a work piece comprising multiple layers.