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.

First principles study of water adsorption on the (100) surface of zircon: Implications for zircon dissolution

Abstract: We have studied the interaction of aqueous species with the (100) face of zircon using first-principles quantum mechanical calculations. Adsorption energy of molecular water on the Zr Lewis site is 1.27 eV per molecule, whereas the energy of dissociative adsorption is only 0.84 eV per molecule. Thus, the non-dissociative adsorption of water is strongly preferred with respect to the dissociative adsorption on the (100) face of zircon. Such behavior, which is related to the weak ability of the surface structure to relax, is changed by a 5% increase of the surface cell parameters. From our theoretical results, we propose that the exceptional resistance of zircon to dissolution may be related to the strong acidity of the Zr-O-Si bridging O atoms, which promotes the associative adsorption of water on the (100) surface of zircon.

1.5kW linear polarized on PM fiber and 2kW on non-PM fiber narrow linewidth CW diffraction-limited fiber amplifier

Abstract: We report on a ruggedized compact modular package narrow linewidth fiber amplifiers with 1.5kW linear polarized output in an all-PM fiber configuration and 2 kW in non-PM fiber configuration for various scientific and advanced applications. The fiber amplifiers have 2m output cable with connector termination for 15GHz linewidth and 20GHz linewidth in PM and in non-PM fiber configuration respectively. The fiber amplifiers have 40% wall-plug efficiency and 15nm spectral bandwidth for 1064nm wavelength range. Measured M2 values of the output beam of the amplifiers are < 1.1.

High Power Fiber Laser System With High Quality Beam

Abstract: A high power fiber laser system has a combiner configured of a plurality of single mode (SM) fibers which are fused together so as to define an output end of the fiber combiner. The fused SM fibers radiate respective fiber outputs, which collectively define a multimode (MM) combiner output. The SM fibers each are configured with such an optimally small numerical apertures (NA) that the MM combiner output is characterized by a minimally possible beam quality factor (M 2 ) for the plurality of SM fibers. To reduce the possibility of burning of the components of the fiber laser system with a multi-kilowatt combiner output, a coreless termination block is fused to the output end of the fiber combiner and configured so as to provide expansion of the combiner output without modifying the minimally possible M 2 factor thereof.

From magma ascent to ash generation: Investigating volcanic conduit processes by integrating experiments, numerical modeling, and observations

Abstract: Processes occurring in volcanic conduits, the pathways through which magma travels from its storage region to the surface, have a fundamental control on the nature of eruptions and associated phenomena. It has been well established that magma flows, crystallizes, degasses, and fragments in conduits, that fluids migrate in and out of conduits, and that seismic and acoustic waves are generated and travel within conduits. A better understanding of volcanic conduits and related processes is of paramount importance for improving eruption forecasting, volcanic hazard assessment and risk mitigation. However, despite escalating advances in the characterization of individual conduit processes, our understanding of their mutual interactions and the consequent control on volcanic activity is still limited. With the purpose of addressing this topic, a multidisciplinary workshop led by a group of international scientists was hosted from 25 to 27 October 2014 by the Pisa branch of the Istituto Nazionale di Geofisica e Vulcanologia under the sponsorship of the MeMoVolc Research Networking Programme of the European Science Foundation. The workshop brought together the experimental, theoretical, and observational communities devoted to volcanological research. After 3 days of oral and poster presentations, breakout sessions, and plenary discussions, the participants identified three main outstanding issues common to experimental, analytical, numerical, and observational volcanology: unsteadiness (or transience), disequilibrium, and uncertainty. A key outcome of the workshop was to identify the specific knowledge areas in which exchange of information among the sub-disciplines would lead to efficient progress in addressing these three main outstanding issues. It was clear that multidisciplinary collaboration of this sort is essential for progressing the state of the art in understanding of conduit magma dynamics and eruption behavior. This holistic approach has the ultimate aim to deliver fundamental improvements in understanding the underlying processes generating and controlling volcanic activity.