ICALEO 2005 Paper #M303 (Electron Beam Welding vs. Laser Beam Welding for Air Bearing Shaft)

Electron Beam Welding vs. Laser Beam Welding for Air Bearing Shaft
Authors:
Mohammed Naeem, GSI Lumonics; Rugby Great Britain
Presented at ICALEO 2005

Air bearings allow designers to push the envelope on precision and high-speed applications. Unlike contact roller bearings, air bearings utilise thin film pressurised air to provide ?zero friction? load bearing interface between surfaces that would otherwise be in contact with each other. Being non-contact, air bearings avoid the tradition bearing- related problems of friction, wear, and lubricant handling, and offer distinct advantages in precision positioning and high speed applications. Air bearings are a natural choice for applications in coo...

ICALEO 2005 Paper #M302 (Micro Welding of Thin Metals with Low Power Pulsed Nd:YAG laser)

Micro Welding of Thin Metals with Low Power Pulsed Nd:YAG laser
Authors:
Mohammed Naeem, GSI Lumonics; Rugby Great Britain
Presented at ICALEO 2005

The primary drivers in Microtechnology are getting smaller in size, increased sophistication and complexity, greater local intelligence, increased predication of in-service reliability and lower cost. These trends result in the need for new materials and assembly technologies and are consequently the adoption of pulsed laser as production tools. In order to adapt the processing speed to the average laser power pulsed laser operation is desirable. Currently some welding applications require very small spot size (30-40m) and pulse energies low as 10m...

ICALEO 2005 Paper #M210 (Direct Micro Laser Cladding with Microscale Nanophased Powders)

Direct Micro Laser Cladding with Microscale Nanophased Powders
Authors:
Peter Stippler, Laser Zentrum Hannover; 30419 Hannover Germany
Andreas Ostendorf, Laser Zentrum Hannover; 30419 Germany
Oliver Meier, Laser Zentrum Hannover; 30419 Hannover Germany
Stefan Czerner, microLS; Hannover Germany
Presented at ICALEO 2005

A manufacturing method is shown based on the most advanced small scale laser cladding technology able to shape solid metallic objects being composed of nanophased powders. New development in powder feeding will be illustrated being able to feed micro particles using combination of brush feeder and ultrasonic vibration. For gradient components...

ICALEO 2005 Paper #M209 (Laser Micro Adjustment - From New Basic Process Knowledge to the Application)

ICALEO 2005 Paper #M208 (Effect of Recombination on Ultrashort Pulse Laser Material Removal by Coulomb Explosion)

Effect of Recombination on Ultrashort Pulse Laser Material Removal by Coulomb Explosion
Authors:
Rohit Viegas, University of Arizona; Tucson AZ USA
Cho Lik Chan, University of Arizona; Tucson AZ USA
Presented at ICALEO 2005

The femtosecond laser material interaction takes place on a very short time scale. The transfer of energy from the pulse to the material cannot be described using thermal concepts as these are based on a time scale which is much longer than that during femtosecond pulse interaction. Therefore the femtosecond pulse may be considered as an intense electromagnetic wave. When a ultra short laser pulse impinges a semiconductor, the atoms are ionized by two processes ...

ICALEO 2005 Paper #M207 (Microshaping of Densely Sintered Zirconia Ceramic Using Femtosecond Lasers)

Microshaping of Densely Sintered Zirconia Ceramic Using Femtosecond Lasers
Authors:
Kristian Werelius, Johann Wolfgang Goethe University Frankfurt; Frankfurt/Main Germany
Niko Baersch, Laser Zentrum Hannover e.V.; Hannover Germany
Fernando Liebana, Laser Zentrum Hannover e.V.; Hannover Germany
Stephan Barcikowski, Laser Zentrum Hannover e.V.; Hannover Germany
Uwe Stute, Laser Zentrum Hannover e.V.; Hannover Germany
Andreas Ostendorf, Laser Zentrum Hannover e.V.; Hannover Germany
Presented at ICALEO 2005

For dental restorations, very dense and hard ceramics - especially hot isostatically pressed forms of zirconia ceramics like HIP ...

ICALEO 2005 Paper #M206 (Water-Jet Guided Fiber Lasers for Mask Cutting)

Water-Jet Guided Fiber Lasers for Mask Cutting
Authors:
Delphine Perrottet, Synova SA; Ecublens Switzerland
Bernold Richerzhagen, Synova SA; Ecublens Vaud Switzerland
Tom Levesque, Synova US; Lewisville TX USA
Presented at ICALEO 2005

The water jet guided laser technology is an innovative process which combines a laser beam and a hair thin water jet by focusing a laser beam through a pressurized water chamber into a nozzle. The water jet emitted from the nozzle guides the laser beam by means of total internal reflection at the water/air interface, in a manner similar to conventional glass fibers. This technology is well suited for micro machining mainly because it gene...

ICALEO 2005 Paper #M205 (Optical Trepanning by Using Axcion Lenses)

Optical Trepanning by Using Axcion Lenses
Authors:
Danyong Zeng, College of Optics and Photonics, University of Central Florida; Orlando FL USA
W.P. Latham, Air Force Research Labortatory, Directed Energy Directorate; Kirtland Air Force Base NM USA
P.F. Jacobs, Laser Fare Inc.; Smithfield NM USA
Aravinda Kar, College of Optics and Photonics, University of Central Florida; Orlando FL USA
Presented at ICALEO 2005

Percussion drilling and trepanning are two laser drilling methods. Circular laser spots are generally used in conventional laser drilling. Annular laser beams provide a new laser drilling mechanism. When an annular beam is focused on the workpiece s...

ICALEO 2005 Paper #M204 (Feasibility Study of Laser Ablation using Long-Pulsed, 300w, Cw Single-Mode Fiber Laser)

Feasibility Study of Laser Ablation using Long-Pulsed, 300w, Cw Single-Mode Fiber Laser
Authors:
Jay Tu, North Carolina State Univ.; Raleigh NC USA
Jason Dilwith, North Carolina State University; Raleigh NC USA
Wm. Harp, North Carolina State University; Raleigh NC USA
Presented at ICALEO 2005

Traditionally, nano-second, pico-second, and femto-second pulsing lasers are used for micro-hole drilling. Using the ultra-short pulse duration, extremely high peak powers can be achieved for laser ablation to drill holes. In this study, we examine the use of a 300W CW fiber laser operated in a modulated mode for micro-hole drilling. As the CW power of this fiber laser is extr...

ICALEO 2005 Paper #M203 (Effect of Beam Angle on Heat Affected Zone, Recast and Oxide Layer in Laser Drilling of Thermal Barrier Coated Nickel Alloys)

Effect of Beam Angle on Heat Affected Zone, Recast and Oxide Layer in Laser Drilling of Thermal Barrier Coated Nickel Alloys
Authors:
Kursad Sezer, The University of Manchester; Manchester UK
Lin Li, The University of Manchester; Manchester UK
Ben Anderson, Rolls-Royce Plc; Derby UK
Paul Williams, Rolls-Royce Plc; Derby UK
Mark Schmidt, The University of Manchester; Manchester Great Britain
Presented at ICALEO 2005

Industrial applications of laser drilling include the production of cooling holes at acute angles in certain parts of the aero-engine components. These parts are usually covered with Thermal Barrier Coatings (TBC) to protect them f...