JLA Vol:24 Iss:4 (Direct laser writing-mediated generation of standardized topographies for dental implant surface optimization)

Authors:
Rainer Wittig
Institut fu¨r Lasertechnologien in der Medizin und Messtechnik (ILM) an der Universita¨t Ulm, 89081 Ulm, Germany

Erik Waller
Georg von Freymann
Arbeitsgruppe Optische Technologien und Photonik und Forschungszentrum OPTIMAS, Fachbereich Physik, Technische Universita¨t Kaiserslautern, 67663 Kaiserslautern, Germany

Rudolf Steiner
Institut fu¨r Lasertechnologien in der Medizin und Messtechnik (ILM) an der Universita¨t Ulm, 89081 Ulm, Germany

The functionalization of dental implants, aiming at the improvement of long-term acceptance, is of pivotal interest in dental research. Bone, connectiv...

JLA Vol:24 Iss:4 (Synthesis of hybrid microgels by coupling of laser ablation and polymerization in aqueous medium)

Authors:
Philipp Nachev
Funktionale und Interaktive Polymere, Institut fu¨r Makromolekulare und Technische Chemie, RWTH Aachen University, Forckenbeckstr. 50, D-52074 Aachen, Germany

Danielle D. van ’T Zand
Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstr. 5-7, D-45141 Essen, Germany

Vincent Coger
Department of Plastic, Hand- and Reconstructive Surgery, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany

Philipp Wagener
Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universit...

JLA Vol:24 Iss:4 (Nano structures via laser interference patterning for guided cell growth of neuronal cells)

Authors:
Elke A. Bremus-Koebberling
Stefan Beckemper
Fraunhofer Institute for Lasertechnology, Steinbachstr. 15, 52074 Aachen, Germany

Beate Koch


Arnold Gillner
Fraunhofer Institute for Lasertechnology, Steinbachstr. 15, 52074 Aachen, Germany and Chair for Laser Technology, Technical University Aachen, Germany

Laser interference patterning is a versatile tool for the fabrication of nano patterns. For this study, regular nano line patterns with feature sizes between 100 and 1000 nm were produced on polymers polyimide, polyetheretherketone, and polydimethylsiloxane. Cell culture experiments with B35 neuronal cells revealed the al...

JLA Vol:24 Iss:4 (Materials and technologies for fabrication of three-dimensional microstructures with sub-100 nm feature sizes by two-photon polymerization)

Authors:
Frank Burmeister
Institute of Applied Physics, Friedrich-Schiller-Universita¨t Jena, D-07743 Jena, Germany and Fraunhofer Institute for Applied Optics and Precision Engineering IOF, D-07745 Jena, Germany

So¨nke Steenhusen
Ruth Houbertz
Fraunhofer Institute for Silicate Research ISC, D-97082 Wu¨rzburg, Germany

Uwe D. Zeitner
Stefan Nolte
Andreas Tu¨nnermann
Institute of Applied Physics, Friedrich-Schiller-Universita¨t Jena, D-07743 Jena, Germany and Fraunhofer Institute for Applied Optics and Precision Engineering IOF, D-07745 Jena, Germany

The fabrication of sub-100 nm featu...

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:24 Iss:4 (Cellular reactions toward nanostructured silicon surfaces created by laser ablation)

Authors:
K. Wallat
Institute of Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstr. 5-7, 45117 Essen, Germany

D. Do¨rr
R. Le Harzic
F. Stracke
D. Sauer
Fraunhofer Institute for Biomedical Engineering (IBMT) and Chair for Molecular and Cellular Biotechnology (University of Saarbruecken), Ensheimer Str. 48, 66386 St. Ingbert, Germany

M. Neumeier
A. Kovtun
Institute of Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstr. 5-7, 45117 Essen, Germany

H. Zimm...

JLA Vol:24 Iss:4 (Experimental and theoretical investigation on fs-laser-induced nanostructure formation on thin gold films)

Authors:
Dirk Wortmann
Lehrstuhl fuer Lasertechnik, RWTH Aachen University, Steinbachstrasse 15, 52074 Aachen, Germany

Ju¨rgen Koch
Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

Martin Reininghaus
Lehrstuhl fuer Lasertechnik, RWTH Aachen University, Steinbachstrasse 15, 52074 Aachen, Germany

Claudia Unger
Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

Conny Hulverscheidt
Lehrstuhl fuer Lasertechnik, RWTH Aachen University, Steinbachstrasse 15, 52074 Aachen, Germany

Dmitry Ivanov
Lehr-und Forschungsgebiet Nichtlineare Dynamik, RWTH Aachen Univ...

JLA Vol:9 Iss:1 (Characteristics of CO₂ laser welded high carbon steel gauge plate)

Authors:
Eng S. Ng
Ian A. Watson
Laser and Optical System Engineering Center, Department of Mechanical Engineering, James Watt Building, University of Glasgow, Glasgow G12 8QQ, U.K.

The welding performance of CO₂ lasers is strongly affected by the clamping geometry and welding speed. Moreover, the rapid cooling rate associated with laser welding results in an untempered martensitic structure and a transverse variation in the hardness profile. An untempered martensitic structure can lead to brittle welds, and particularly for samples that are subject to cyclic loading, component fatigue and failure. To avoid this problem it is useful to optimize the laser operat...

JLA Vol:9 Iss:1 (On the formation of the keyhole and its temperatures)

Authors:
E. A. Metzbower
US Naval Research Laboratory, Code 6320, Washington, DC 20375‐5000, U.S.A.

A thermodynamically based model has been developed to calculate the size and temperature of the ‘keyhole’ through the thickness of the weldment. The model is based on calculating the power loss resulting from evaporation of an element in the chemistry of the plate and a minimum power density required to produce a keyhole. The evaporative power loss is set equal to the Gaussian power density, which is used to represent the laser beam. The result is a temperature distribution across the keyhole. Absorption of the laser power in the keyhole is calculated based on inverse...

JLA Vol:9 Iss:1 (Laser cladding of Al‐Sn alloy on a mild steel)

Authors:
Z. Liu
J. L. Sun
W. M. Steen
K. G. Watkins
C. Lee
W. P. Brown

Direct laser cladding of Al alloy on mild steel produces continuous brittle intermetallic Fe_xAl_y layers at the interface resulting in weak bonding of the clad and the substrate. To overcome this problem, both Ni and Al were investigated as intermediate coatings. Although a Ni coating with a thickness of 70 μm was successful in eliminating the formation of continuous Al‐Fe intermetallics, the bonding at the Al alloy/Ni interface was not strong enough to survive a bending test. A pure Al coating was found to be a better ...