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 system and method for processing sapphire

Abstract: Laser processing of sapphire is performed using a continuous wave laser operating in a quasi-continuous wave (QCW) mode to emit consecutive laser light pulses in a wavelength range of about 1060 nm to 1070 nm (hereinafter "QCW laser"). Laser processing of sapphire using a QCW laser may be performed with a lower duty cycle (e.g., between about 1% and 10%) and in an inert gas atmosphere such as argon or helium. Laser processing of sapphire using a QCW laser may further include the use of an assist laser having a shorter wavelength and/or pulse duration to modify a property of the sapphire substrate to form absorption centers, which facilitate coupling of the laser light pulses of the QCW laser into the sapphire.

Structural and magnetic anisotropies of Fe/ ZnSe (001) thin films

Abstract: The morphology, the atomic structure, and the strain of very thin $\mathrm{Fe}$ epilayers grown on $\mathrm{ZnSe}(001)$ have been studied by combined scanning tunnel microscope (STM) and extended x-ray-absorption fine-structure experiments. It turns out that the crystal structure of the flat and anisotropic islands (up to 5 monolayers) and terraces (higher coverages) observed by STM is close to bulk iron but affected by a weak out-of-plane tetragonal distortion. Strain measurements and magnetic anisotropy constants of very thin films obtained by ferromagnetic resonance measurements allow us to conclude that the important out-of-plane anisotropy term is determined by the interface atomic structure. Finally, we put forward two hypotheses to explain why the measured out-of-plane anisotropy is one order of magnitude larger than the [110] in-plane anisotropy. The former is related to a disordered configuration of iron and zinc atoms between bonding and antibonding sites at the interface. The latter hypothesis is related to the direction of the demagnetization field due to the morphology of iron films.

Highly-efficient high-power pumps for fiber lasers

Abstract: We report on high efficiency multimode pumps that enable ultra-high efficiency high power ECO Fiber Lasers. We discuss chip and packaged pump design and performance. Peak out-of-fiber power efficiency of ECO Fiber Laser pumps was reported to be as high as 68% and was achieved with passive cooling. For applications that do not require Fiber Lasers with ultimate power efficiency, we have developed passively cooled pumps with out-of-fiber power efficiency greater than 50%, maintained at operating current up to 22A. We report on approaches to diode chip and packaged pump design that possess such performance.

Signature morphologique de l'activité de la faille des Cévennes (Languedoc, France)

Abstract: The Tertiary Cevennes faul! presents typical geomorphic characters of active faults. Its trace is sharp on SPOT images and air photographs. It is segmented (15–30 km) and has locally multiple strands. Along the main fault trace, abandoned valleys and terrace risers of the Herault and Gardon rivers are offset sinistrally by several hundreds of metres. This suggests that the fault is an active Quaternary fault whose left slip-rate may range between 0.1 and 2 mm·yr1.