JLA Vol:24 Iss:5 (<em>Quo vadis</em>, laser additive manufacturing?)

Authors:
Ingomar Kelbassa
Fraunhofer Institute for Laser Technology ILT, Steinbachstrasse 15, 52074 Aachen, Germany and Chair for Laser Technology LLT, RWTH Aachen University, Steinbachstrasse 15, 52074 Aachen, Germany

Terry Wohlers
Tim Caffrey
Wohlers Associates, Inc., OakRidge Business Park, 1511 River Oak Drive, Fort Collins, Colorado 80525

JLA Vol:24 Iss:5 (The numerical analysis and measurements of temperature profile in fat tissue during neodymium-doped yttrium aluminum garnet laser irradiation for laser-assisted lipolysis)

Authors:
Jong-In Youn
Department of Biomedical Engineering, College of Medical Science, Catholic University of Daegu, Hayangeup, Gyongsansi, Gyongbuk 712-702, South Korea

The purpose of the study is to investigate the temperature profile of fat tissue during neodymium-doped yttrium aluminum garnet laser irradiation (1064, 1320, and 1444 nm wavelengths) for laser-assisted lipolysis. The numerical analysis was performed to assess the wavelength dependence of the temperature distribution in fat tissue. For the internal temperature profile measurements, a cannula was placed in the middle of fat tissue for laser irradiation, and two hypodermic thermocouple needles were placed at 2 and 5 mm...

JLA Vol:24 Iss:5 (Development of new processes for welding of thermal Al&ndash;Cu solar absorbers using diode lasers)

Authors:
Andre Springer
Peter Kallage
Michael Hustedt
Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

Stephan Barcikowski
University of Duisburg-Essen, Technical Chemistry I, Universitaetsstr. 5–7, 45141 Essen, Germany

Volker Wesling
Heinz Haferkamp
Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

Flat-plate solar collectors are favorable devices to generate heat from the energy of the Sun. The central part of a collector, the solar absorber, is a front-coated aluminum sheet with a copper tube fixed on the back side in order to transport heated liquid. ...

JLA Vol:25 Iss:1 (Spatial analysis of the back reflected laser light during CO₂-laser cutting of metal sheets)

Authors:
David Schindhelm
Graduate School of Excellence Advanced Manufacturing Engineering in Stuttgart (GSaME), Universita¨t Stuttgart, D-70569 Stuttgart, Germany and Institut fu¨r Strahlwerkzeuge (IFSW), Universita¨t Stuttgart, Pfaffenwaldring 43, D-70569 Stuttgart, Germany

Rudolf Weber
Thomas Graf
Institut fu¨r Strahlwerkzeuge (IFSW), Universita¨t Stuttgart, Pfaffenwaldring 43, D-70569 Stuttgart, Germany

During laser material processing such as laser welding or cutting, it is known that the whole laser power is not only absorbed in or transmitted through the interaction zone, but a significant percentage is also reflected back ...

JLA Vol:25 Iss:1 (Review on laser drilling I. Fundamentals, modeling, and simulation)

Authors:
Wolfgang Schulz
Fraunhofer Institute for Laser Technology, ILT, Aachen, Germany and Nonlinear Dynamics of Laser Processing, RWTH Aachen University, 52074 Germany

Urs Eppelt
Nonlinear Dynamics of Laser Processing, RWTH Aachen University, 52074 Germany

Reinhart Poprawe
Fraunhofer Institute for Laser Technology, ILT, Aachen, Germany and Nonlinear Dynamics of Laser Processing, RWTH Aachen University, 52074 Germany

High peak power lasers have been used for years for ablating matter. The most relevant application of this process is laser marking. Marking meets the demands of applications although the quality of ablation has potential to b...

JLA Vol:25 Iss:1 (Theoretical analysis of multiple-pulse thermal damage thresholds of the retina)

Authors:
C. D. Clark
TASC Inc., 4141 Petroleum Road, Suite 4007 Fort Sam Houston, Texas 78234

W. J. Marshall
Laser Safety Specialties, Wilmington, Delaware 19810

R. J. Thomas
Air Force Research Laboratory, 711 HPW/RHDO, 4141 Petroleum Road, Fort Sam Houston, Texas 78234

In this paper, we present a theoretical analysis of multiple-pulse thermal damage thresholds based on the Arrhenius integral damage model. We consider the dependence of thresholds on both the number of pulses and the pulse spacing and show that the trends can be understood by considering the thermal relaxation time. The biological data that exists in the multiple-pulse therma...

JLA Vol:25 Iss:1 (Implementation of a novel scan localization system for wireless sensor networks)

Authors:
K. Sun
W. Huang
Sachula Meng
Y. Xiao
M. T. Wang
Z. Xiao
Inner Mongolia University, Hohhot 010021, China

A novel localization scheme called laser beam scan localization by combining grid and light (laser) with mobile localization policy for wireless sensor networks is designed. The scheme utilizes a moving location assistant (LA) with a laser beam, through which the deployed area is scanned. The LA sends identities to unknown nodes to obtain the locations of sensor nodes. High localization accuracy can be achieved without the aid of expensive hardware on the sensor nodes, as required by other localization systems...

JLA Vol:25 Iss:1 (Fatigue crack propagation in laser alloyed ductile cast iron surface)

Authors:
Zheng-yang Li
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China and Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China

Hai-yan Zhao
Yu Gu
Min-lin Zhong
Bin Zhang
Hong-jun Zhang
Wen-jin Liu
Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China

Zhi-yuan Ren
Ming-jiang Yang

JLA Vol:25 Iss:1 (Wettability modification of electrospun poly(&epsilon;-caprolactone) fiber by femtosecond laser irradiation)

Authors:
Lingna He
Dave F. Farson
Laboratory for Multiscale Processing and Characterization, The Ohio State University, 1248 Arthur E Adams Drive, Columbus, Ohio 43221 and Department of Materials Science and Engineering, The Ohio State University, 477 Watts Hall, 2041 College Road, Columbus, Ohio 43210

Jian Chen
Materials Science and Technology Division, Oak Ridge National Laboratory, One Bethel Road, P.O. Box 2008, MS-6095, Oak Ridge, Tennessee 37831-6095

John J. Lannutti
Department of Materials Science and Engineering, The Ohio State University, 477 Watts Hall, 2041 College Road, Columbus, Ohio 43210

Stan I. Rokhlin
Labora...

JLA Vol:24 Iss:5 (A comparative study of cut front profiles and absorptivity behavior for disk and CO₂ laser beam inert gas fusion cutting)

Authors:
Leonardo Daniele Scintilla
Luigi Tricarico
Dipartimento di Meccanica, Matematica e Management (DMMM), Politecnico di Bari, Viale Japigia, 182–70126 Bari, Italy

Achim Mahrle
Institute of Manufacturing Technology, Technische Universita¨t Dresden, 01062 Dresden, Germany and Fraunhofer IWS Dresden, Winterbergstraße 28, 01277 Dresden, Germany

Andreas Wetzig
Fraunhofer IWS Dresden, Winterbergstraße 28, 01277 Dresden, Germany

Eckhard Beyer
Institute of Manufacturing Technology, Technische Universita¨t Dresden, 01062 Dresden, Germany and Fraunhofer IWS Dresden, Winterbergstraße 28, 01277 Dres...