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.

Laser welding tool

Abstract: A welding tool is configured with a housing enclosing a fiber laser system which is operative to produce a weld seam for connecting two workpieces. The fiber laser system includes a focusing optic configured to focus the output beam of the system so that it propagates through an elongated slit formed in the bottom of the housing. The fiber laser system is capable to move along a predetermined path extending parallel to the longitudinal direction of the slit and limited by the perimeter thereof. The output beam is generated only when the slit sits upon at least one of the workpieces.

High power (9.2 W) CW 4.15 μm Fe:ZnSe laser

Abstract: We report to the best of our knowledge the highest output power of 9.2 W Fe:ZnSe laser operating in CW regime. The lasing wavelength was at 4.15 μm in non-selective cavity at 77K.

Magnetic monitoring of hydrothermal magnetite nucleation-and-growth: Record of magnetic reversals

Abstract: Hematite reduction in the presence of pyrite and CaO led to the formation of anhydrite and magnetite at 30 MPa and 723 K under hydrothermal conditions in a sealed gold container. For the first time, hydrothermal magnetite production was monitored magnetically at the run conditions. Sample magnetic susceptibility was found to follow an Avrami kinetic law with k = 1.5 10 −5 /s and n = 2.07. Application of up to two external field reversals in the course of the magnetite production reaction shows that partial Chemical Remanent Magnetizations (CRM) are recorded by the sample. The intensity of each partial CRM acquired within a given time interval (under a given field intensity) is proportional to the amount of magnetite produced during that time interval. Alternating magnetic field demagnetization failed at separating these partial CRMs, which are believed to superpose in the ( V , Hc ) diagram of Neel. Additional TEM, SEM, and magnetic characterizations suggest that continuous nucleation and fast magnetite growth (to a maximum size of ca. 10 μm), compared to the field polarity duration, can account for the evolution of the sample CRM with time. This study demonstrates that one should be cautious when using natural CRM apparent polarity to infer timing of the corresponding chemical event.

Inhomogeneous shearing related to rock composition: evidence from a major late-Panafrican shear zone in the Tuareg shield (Algeria)

Abstract: This study describes the deformation in zones affected by regional shearing, and its relation with local factors, in particular rock compositions. The Tihaliouine and Teg Orak plutons were emplaced close to a major shear zone of the Tuareg shield. Their magmatic to sub-magmatic fabrics were determined by using measurements of anisotropy of magnetic susceptibility; they are similar to those of some other late Panafrican plutons of the Tuareg shield. The eastern part of the Teg Orak pluton displays a coherent fabric with a subhorizontal lineation oblique to the 4°50 major shear zone located just to the east. This fabric is clearly related to shearing by a dextral strain-slip movement along the shear zone during magma crystallization. The fabric in the western part of the Teg Orak pluton and in the Tihaliouine massif presents much more scattered principal axes. It was much less affected by shearing along the shear zone. This difference strongly depends on the nature of the host-rocks: Granitic host-rocks around the Tihaliouine and the western part of the Teg Orak acted as a rigid block, protecting the intrusions from regional deformation, while basic plutonic and metamorphic host-rocks around the eastern part of the Teg Orak pluton had a more plastic behavior and transmitted the regional strain to the intrusion.