ICALEO 2007 Paper #403 (Direct Laser Deposition - A Comparative Study Using Different CW YAG Lasers and with In Situ Real-Time Spectroscopy and Imaging)

Direct Laser Deposition– A Comparative Study Using Different CW YAG Lasers and with In Situ Real-Time Spectroscopy and Imaging
Authors:
Konrad Bartkowiak, Poznan University of Technology; Dresden Poland
Mikhail Vasilyev, Saint-Petersburg State Polytechnic University; Polytechnicheskaya SPb Russia
Presented at ICALEO 2007

Direct Laser Deposition (DLD) is an emerging technology which shows great potential for direct manufacture. The DLD method has become viable for the build up of three-dimensional parts, their repair or modification, as a means of rapid prototyping and tooling of metallic components. However, compositional monitoring of the DLD process is still requires investigat...

ICALEO 2007 Paper #402 (Investigation of Laser Consolidation for Manufacturing Functional Net-Shape Components for Potential Rocket Engine Applications)

Investigation of Laser Consolidation for Manufacturing Functional Net-Shape Components for Potential Rocket Engine Applications
Authors:
Lijue Xue, National Research Council Canada, Integrated Manufacturing Technologies Institute; London ON Canada
Thomas Van Daam, Pratt & Whitney Rocketdyne, Inc. ; Canoga Park CA USA
Yangsheng Li, National Research Council Canada, Integrated Manufacturing Technologies Institute; London ON Canada
Clifford Bampton, Pratt & Whitney Rocketdyne, Inc.; Canoga Park CA USA
Presented at ICALEO 2007

Laser consolidation is an emerging novel computer-aided manufacturing process that produces net-shape functional metallic parts layer b...

ICALEO 2007 Paper #401 (Measuring Laser Absorption Coefficient during Laser Additive Manufacturing of 316L Stainless Steel and Ti-6V-4Al Alloys)

Measuring Laser Absorption Coefficient during Laser Additive Manufacturing of 316L Stainless Steel and Ti-6V-4Al Alloys
Authors:
James Sears, South Dakota School of Mines & Technology; Rapid City SD USA
Presented at ICALEO 2007

There have been considerable modeling efforts aimed at studying the thermal response and residual stresses produced during Laser Powder Deposition. However, there has been little published on quantifying the laser energy transfer during Laser Powder Deposition. The energy transfer measurement is critical for producing accurate estimate of the thermal response and residual stresses produced. An accurate energy input is required when modeling. This input is dependent on...

ICALEO 2007 Paper #309 (High-Speed Laser Welding of Fuel Cell Metals)

High-Speed Laser Welding of Fuel Cell Metals
Authors:
Stanley Ream, EWI; Columbus OH USA
Presented at ICALEO 2007

As concerns about energy independence increase, government and industry are focusing more attention on improving energy utilization. Among the many opportunities for higher energy efficiency fuel cells have attracted considerable scientific, engineering, and popular attention. While most of the envisioned fuel cell devices and systems are still in the design stages, the potential manufacturers of these products are recognizing the need to develop manufacturing solutions to their unique fabrication challenges. Despite the tremendous diversity in fuel cell system designs one fabric...

ICALEO 2007 Paper #308 (Micro Welding for Environmental-friendly Products)

Micro Welding for Environmental-friendly Products
Authors:
Florian Wagner, BIAS; Bremen Germany
Frank Vollertsen, BIAS - Bremer Institut für angewandte Strahltechnik GmbH; Bremen Germany
Claus Thomy, BIAS; Bremen Germany
Presented at ICALEO 2007

Laser welding can be scaled down even to very small dimensions, where other welding techniques are not applicabel. A high processing speed, high precision, good process control and low penetration depth with deep penetration welding even at thicknesses of some 100 micron are the benefits of micro laser welding. Process developments, using pulsed and cw laser, are shown. Welding of similar and dissimilar materials like alumini...

ICALEO 2007 Paper #306 (Laser Technology for Solar Cells and Solar Receivers)

Laser Technology for Solar Cells and Solar Receivers
Authors:
Aart Schoonderbeek, Laser Zentrum Hannover e.V.; Hannover Germany
Lars Richter, Laser Zentrum Hannover e.V.; Hannover Germany
Rainer Kling, Laser Zentrum Hannover e.V.; Hannover Germany
Andreas Ostendorf, Laser Zentrum Hannover e.V.; Hannover Germany
Berend Denkena, Laser Zentrum Hannover e.V.; Hannover Germany
Rainer Grischke, ISFH; Emmerthal Germany
S. Mau, ISFH; Emmerthal Germany
N.P. Harder, ISFH; Emmerthal Germany
R. Brendel, ISFH; Emmerthal Germany
Presented at ICALEO 2007

During the last years, solar energy conversion by pho...

ICALEO 2007 Paper #305 (Laser Surface Texturing for Reducing Reflection Losses in Multicrystalline Silicon Solar Cells)

Laser Surface Texturing for Reducing Reflection Losses in Multicrystalline Silicon Solar Cells
Authors:
Barbara Terheiden, Isfh; Hameln Germany
Rainer Grischke, Institute for Solar Energy Research Hamelin; Emmerthal Germany
Susanne Mau, ISFH; Hamelin Germany
Aart Schoonderbeek, Laser Zentrum Hannover; Hannover Germany
Nils Peter Harder, ISFH; Hamelin Germany
Andreas Ostendorf, LZH; Hannover Germany
Rainer Kling, LZH; Hannover Germany
B. Denkena, LZH; Hannover Germany
Rolf Brendel, ISFH; Hamelin Germany
Presented at ICALEO 2007

On monocrystalline silicon solar cells the light trapping effect c...

ICALEO 2007 Paper #304 (Customized Short and Ultrashort Laser Pulses for the Photovoltaics Industry)

Customized Short and Ultrashort Laser Pulses for the Photovoltaics Industry
Authors:
Juergen Stollhof, TRUMPF Laser Technology Center; Plymouth Township MI USA
S. Weiler, Trumpf Laser GmbH; Schramberg Germany
C. Tan, Trumpf Laser GmbH; Schramberg Germany
I. Zawischa, Trumpf Laser GmbH; Schramberg Germany
D.H. Sutter, Trumpf Laser GmbH; Schramberg Germany
J. Kleinbauer, Trumpf Laser GmbH; Schramberg Germany
M. Kumkar, Trumpf Laser GmbH; Schramberg Germany
Presented at ICALEO 2007

Market studies anticipate a dramatic increase in the worldwide production capacity of solar cells and modules in the next years. To achieve t...

ICALEO 2007 Paper #302 (Laser Scribing: A Key Enabling Technology for Manufacturing of Low Cost Thin Film Photovoltaic Cells)

Laser Scribing: A Key Enabling Technology for Manufacturing of Low Cost Thin Film Photovoltaic Cells
Authors:
Rajesh Patel, Newport-Spectra Physics; Mountain View CA USA
Dave Clark, Newport-Spectra Physics; CA USA
Jim Bovatsek, Newport-Spectra Physics; Mountain View CA USA
Presented at ICALEO 2007

Solar cells are becoming a highly promising alternative energy source for various markets. In last five years or so tremendous amount of research effort has been put in to increase the efficiency of solar cells and in reducing the manufacturing cost. It is believed that success in both of these areas will further propel its use in various markets. The two major structures p...

ICALEO 2007 Paper #301 (Thin Film Silicon Solar Cell and Module Application (Invited Paper -40 Minute Presentation))

Thin Film Silicon Solar Cell and Module Application (Invited Paper -40 Minute Presentation)
Authors:
Katsuhiko Nomoto, Sharp Corporation; Nara Japan
Presented at ICALEO 2007

Strong concern for the global environmental issues has brought dramatic growth of clean energy market since the late 1990s. In order to meet huge demand for solar energy, together with our expansion of the production of the crystalline Si solar cells and modules, we have been researching thin film silicon materials and developing solar cells and modules with these new materials.
In 2005, we started mass production of the crystalline thin film silicon based solar cells and modules. In this article, our activities for th...