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.

Iron speciation using electron microprobe techniques: application to glassy melt pockets within a spinel lherzolite xenolith

Abstract: A quantitative determination of Fe 3+ /ΣFe ratios using the electron microprobe is presented for glasses. The measurements are based on the shift of the Fe- L α peak position between Fe 3+ and Fe 2+ , resulting from differences in self-absorption. We present new calibration curves for glasses with Fe contents as low as 2 wt.% Fe. This method was used for glasses from a metasomatized spinel lherzolite (Massif Central, France) in which highly vesicular glass associated with secondary minerals occurs in reaction pockets around corroded Cr-spinels. The glass was found to be oxidized homogeneously with Fe 3+ /ΣFe ≈ 0.70 (measured with an uncertainty of ±0.06), in contrast with the value of ∼0.15 that would correspond to the former melt under f O 2 conditions inferred from secondary minerals. The glass oxidation probably results from the dissociation of the melt-water content under degassing, prior to local hematite depositions (spinel rims and crack fillings).

20W single-frequency fiber laser operating at 1.93 um

Abstract: We have demonstrated a high power Tm-doped fiber laser system operating at 1.93 um. The DFB fiber laser with 20 mW output power is amplified in a Tm-doped all-fiber amplifier system to the output power of 20 W.

High average power (35 W) pulsed Fe:ZnSe laser tunable over 3.8–4.2 μm

Abstract: We report to the best of our knowledge the highest output average power of 35W (0.35J per pulse) of Fe:ZnSe laser operating at 100 Hz repetition rate in nonselective cavity, and 23 W (0.23J per pulse) in dispersive cavity. The lasing wavelength was tuned over 3.88–4.17 μm at 77K.

Combinatorial Hopf algebras from renormalization

Abstract: In this paper we describe the right-sided combinatorial Hopf structure of three Hopf algebras appearing in the context of renormalization in quantum field theory: the non-commutative version of the Faa di Bruno Hopf algebra, the non-commutative version of the charge renormalization Hopf algebra on planar binary trees for quantum electrodynamics, and the non-commutative version of the Pinter renormalization Hopf algebra on any bosonic field. We also describe two general ways to define the associative product in such Hopf algebras, the first one by recursion, and the second one by grafting and shuffling some decorated rooted trees.