JLA Vol:16 Iss:1 (Laser annealing of silicon nanocrystal films formed by pulsed-laser deposition)

Authors:
C. F. Tan
X. Y. Chen
Laser Microprocessing Laboratory and Silicon Nano Device Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

Y. F. Lu
Department of Electrical Engineering, University of Nebraska, Lincoln, Nebraska 68588-0511

Y. H. Wu
B. J. Cho
J. N. Zeng
Laser Microprocessing Laboratory and Silicon Nano Device Laboratory, Department of Electric and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

We report the laser annealing effects on...

JLA Vol:20 Iss:2 (Laser bioeffects associated with ultrafast lasers: Role of multiphoton absorption)

Authors:
Randolph D. Glickman
Department of Ophthalmology, University of Texas Health Science Center, San Antonio, Texas 78229-3900

Thomas E. Johnson
Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, Colorado 80523

Gary D. Noojin
David J. Stolarski
Michael L. Denton
Northrup Grumman Warfighter and Applications Department, San Antonio, Texas 78228-1330

Neeru Kumar
Department of Ophthalmology, University of Texas Health Science Center, San Antonio, Texas 78229-3900

Benjamin A. Rockwell
US Air Force Research Laboratory, AFRL/HEDO, Brooks City...

JLA Vol:14 Iss:2 (Development of simulated pigmented lesions in an optical skin-tissue phantom: Experimental measurements in the visible and near infrared)

Authors:
Manuela Lualdi
Ambrogio Colombo
Alberto Mari
Stefano Tomatis
Renato Marchesini
Medical Physics Unit, Istituto Nazionale per lo Studio e la Cura dei Tumori, Milan, Italy

Realistic, pigmented skin simulants (“phantoms”) can be useful in optimizing dermal laser procedures and for laser surgical training. Diffuse reflectance of skin pigmented lesions depends on the amount and distribution of the absorbing/diffusing chromophores, mainly hemoglobin and melanin, embedded in the skin layers. The reason why diffuse reflectance of benign melanocytic lesions is different from that of melanoma is still unclear. In an attempt...

JLA Vol:18 Iss:3 (The influence of joint gap on the strength of hybrid Nd:yttrium-aluminum-garnet laser-metal inert gas welds)

Authors:
M. Wouters
Division of Manufacturing Systems Engineering, Luleå University of Technology, S-971 87 Luleå, Sweden

J. Powell
Division of Manufacturing Systems Engineering, Luleå University of Technology, S-971 87 Luleå, Sweden and Laser Expertise Ltd., Acorn Park Ind. Estate, Harrimans Lane, Nottingham NG7 2TR, United Kingdom

A. F. H. Kaplan
Division of Manufacturing Systems Engineering, Luleå University of Technology, S-971 87 Luleå, Sweden

This article presents the results of an experimental and theoretical analysis of the effect of joint gap on the strength of hybrid laser-metal inert gas welds. ...

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

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:25 Iss:3 (Surface pore initiated fatigue failure in laser clad components)

Authors:
M. M. Alam
J. Powell
A. F. H. Kaplan
Department of Engineering Science and Mathematics, Luleå University of Technology, SE-971 87 Luleå, Sweden

J. Tuominen
P. Vuoristo
Department of Materials Science, Tampere University of Technology, FI-33101 Tampere, Finland

J. Miettinen
J. Poutala
Department of Mechanics and Design, Tampere University of Technology, FI-33101 Tampere, Finland

J. Na¨kki
Department of Materials Science, Tampere University of Technology, FI-33101 Tampere, Finland and Technology Centre KETEK Ltd, FI-67100 Kokkola, Finland

J. Junkala

JLA Vol:23 Iss:1 (Picosecond laser-induced color centers in glass optics)

Authors:
David Ashkenasi
Andreas Lemke
Applied Laser Technology, Laser- and Medical-Technology Berlin (LMTB) GmbH, Fabeckstr. 60-62, 14195 Berlin, Germany

It is known that ionizing radiation (x ray, gamma rays, and electrons) can induce numerous changes in the physical properties of glasses. The most obvious effect is visible coloration, which is caused by the accumulation of color centers (defects) in the irradiated volume. The application of such induced color centers has prompted a renewed interest since they can be generated and bleached reversibly. We present results on laser-induced color centers in different types of glasses using picosecond laser pulses. By applyi...