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.

Three‐dimensional resistivity tomography of Vulcan's forge, Vulcano Island, southern Italy

Abstract: [1] 9,525 DC resistivity measurements were taken along 9 profiles crossing the volcanic edifice of La Fossa di Vulcano (the forge of God Vulcan in ancient Roman mythology), Vulcano Island (Italy) using a total of 958 electrode locations. This unique data set has been inverted in 3D by minimizing the L2 norm of the data misfit using a Gauss-Newton approach. The true 3D inversion was performed using parallel processing on an unstructured tetrahedral mesh containing 75,549 finite-element nodes and 398,208 elements to accurately model the topography of the volcanic edifice. The 3D tomogram shows a very conductive body (>0.1 S/m) comprised inside the Pietre Cotte crater with conductive volumes that are consistent with the position of temperature and CO2 anomalies at the ground surface. This conductive body is interpreted as the main hydrothermal body. It is overlaid by a resistive and cold cap in the bottom of the crater. The position of the conductive body is consistent with the deformation source responsible for the observed 1990–1996 deflation of the volcano associated with a decrease of hydrothermal activity.

Optical parametric oscillation in a random polycrystalline medium

Abstract: We demonstrate an optical parametric oscillator (OPO) based on random phase matching in polycrystalline ZnSe The OPO was pumped by Cr:ZnS laser pulses (235 μm, 62 fs, 79 MHz), had a pump threshold of 90 mW, and produced an ultrabroadband spectrum spanning 3–75 μm

Stokes flow through a channel with wavy walls

Abstract: Stokes flow is solved through a channel with three-dimensional wavy walls enclosed by two wavy walls whose amplitude is proportional to the mean clearance of the channel multiplied by the small dimensionless parameter ɛ. The application of an analytical-numerical algorithm yields efficient formulas for the velocities and permeability. These formulas include ɛ in symbolic form. When ɛ increases, the Poiseuille flow (ɛ=0) is disturbed and eddies can arise above a critical value ɛ =ɛ e . These results are also successfully compared to the ones derived by a fully numerical solution.

Powerful fiber laser system

Abstract: A powerful fiber laser system is configured with at least one large-area multi-clad rare-earth doped fiber, which is configured with a MM core capable of propagating a single mode laser emission at a first wavelength, and with at least one pumping assembly capable of generating an optical pump output at a wavelength shorter than the first wavelength of the rare-earth doped fiber. The pumping assembly has a plurality SM fiber lasers coupled to a SM-MM combiner which is operative to lunch the pump output into the cladding of the rare-earth doped fiber so that the powerful fiber laser system is operative to deliver a power of up to 20 kW.