JLA Vol:16 Iss:4 (Laser transmission welding of polymer and wood composites: Material and joint mechanism related studies)

Authors:
H. Haferkamp
A. von Busse
S. Barcikowski
A. Ostendorf
J. Bunte
Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

Laser beam transmission welding is an innovative and promising technology for many industries such as the automotive, electronic, and medical industry. Extension to application of this technology to wood components makes it also interesting for the woodworking and furniture industry. Therefore, several investigations in the field of welding of fiber reinforced thermoplastic and wood composites with polymers have been carried out. Focus is given to the determination of the weldability and weld ...

JLA Vol:21 Iss:1 (Visualization of events inside kerfs during laser cutting of fusible metal)

Authors:
Peter Yudin
Oleg Kovalev
Khristianovich Institute of Theoretical and Applied Mechanics, Novosibirsk, 630090, Russia

The subject of the research is mechanism of melt removal and striated roughness generation. Being the main obstacle limiting laser cutting process performance, these phenomena are widely discussed. Available theoretical descriptions are not conclusive, as they have nothing to be verified with. High temperatures and narrowness of the kerf severely limit visual access at a real facility. Observation will become possible if one wall of the kerf is made of glass. This possibility is utilized in present experiments, which reproduce the process at low tem...

JLA Vol:26 Iss:1 (Investigation on reducing distortion by preheating during manufacture of aluminum components using selective laser melting)

Authors:
Damien Buchbinder
Wilhelm Meiners
Norbert Pirch
Konrad Wissenbach
Fraunhofer Institute for Laser Technology (ILT), Aachen 52074, Germany

Johannes Schrage
Chair for Laser Technology, RWTH Aachen University, Germany 52024, Aachen

The additive manufacturing process selective laser melting (SLM) can be used to directly produce functional components made out of metal. During the construction process, however, thermally induced residual stress occurs due to the layered build-up and the local input of energy by means of a focused laser beam, which can lead to distortion of the component or sections of the component itself....

JLA Vol:24 Iss:4 (Structural study of near-field ablation close to plasmon-resonant nanotriangles)

Authors:
Andreas Kolloch
Paul Leiderer
Department of Physics, University of Konstanz, Universita¨tsstr. 10, D-78457 Konstanz, Germany

Shyjumon Ibrahimkutty
Daniel Issenmann
Anton Plech
Institute for Synchrotron Radiation, Karlsruhe Institute of Technology, Postfach 3640, D-76021 Karlsruhe, Germany

The optical near fields in close vicinity to plasmonic nanoscale objects show a considerable enhancement of the electrical field and are localized to dimensions much less than the wavelength of light. The authors show that an ablation process caused by the near-field enhancement of femtosecond laser pulses pattern the substrate...

JLA Vol:4 Iss:3 (Laser Safety in Health Care Facilities — Revision of ANSI Z136.3‐1988)

Authors:
Rocco V. Lobraico
Co‐chairman Z136.3 subcommittee