ICALEO 2011 Paper #M704 (Investigation of Low Nanosecond Light-Matter Interaction Mechanisms)
Investigation of Low Nanosecond Light-Matter Interaction Mechanisms
Authors:
Krste Pangovski, University of Cambridge; Cambrdge Great Britain
Kun Li, University of Cambridge; Cambridge Great Britain
Bill O'Neill, University of Cambridge; Cambridge Great Britain
Presented at ICALEO 2011
Laser ablation of solid Silicon targets using pulsed Yb
fiber lasers of pulse duration 1.5-400 ns Yb fiber lasers
is studied in this work. Material responses of a range of
pulse envelopes are examined including front peak
(FP) and double peak (DP) pulses. Theoretical models
for the interactions are examined and qualitative
explanations of material response experiments are
presented.$28.00
ICALEO 2011 Paper #M703 (Acoustical Focal Positioning for Micromachining Using a Picosecond Pulsed UV-Laser)
Acoustical Focal Positioning for Micromachining Using a Picosecond Pulsed UV-Laser
Authors:
Volker Schulze, Karlsruhe Institute of Technology (KIT); Karlsruhe Germany
Patricia Weber, Karlsruhe Institute of Technology (KIT); Karlsruhe Germany
Presented at ICALEO 2011
Picosecond pulsed UV-lasers enable micromachining down to a few microns in nearly all kinds of solid materials like metals, ceramics and polymers. However, precise machining results with high surface quality require a defined sublimation process [1]. Problems arise by accurate focal positioning on the work piece surface and by decreasing laser power for long machining times caused by laser and temperature influence on o...$28.00
ICALEO 2011 Paper #M701 (Laser Micro-Adjustment Using Ultra-Short Pulses)
Laser Micro-Adjustment Using Ultra-Short Pulses
Authors:
Jonathan Griffiths, University of Liverpool; Liverpool Great Britain
Stuart P. Edwardson, University of Liverpool; Liverpool Great Britain
Geoff Dearden, University of Liverpool; Liverpool Great Britain
Ken G. Watkins, University of Liverpool; Liverpool Great Britain
Presented at ICALEO 2011
MEMS manufacturing requires accurate positioning and high reproducibility. Lasers can be utilised in accurate post-fabrication adjustment, allowing for manufacturing processes with relatively large tolerances. Laser micro forming (LμF) is a process for the precision adjustment, shaping or correction of distortio...$28.00
ICALEO 2011 Paper #M606 (A Novel Laser Trepanning System for Research and Production)
A Novel Laser Trepanning System for Research and Production
Authors:
David Ashkenasi, Laser- und Medizin- Technologie Berlin GmbH; Berlin Germany
Tristan Kaszemeikat, Laser- und Medizin- Technologie Berlin GmbH; Berlin Germany
Norbert Mueller, Laser- und Medizin- Technologie Berlin GmbH; Berlin Germany
Richard Dietrich, Laser- und Medizin- Technologie Berlin GmbH; Berlin Germany
Daniel Jahns, HAWK - Hochschule fur Angewandte Wissenschaft und Kunst, Laser- und Medizin- Technologie Berlin GmbH; GöTtingen Germany
Gerd Illing, Laser- und Medizin- Technologie Berlin GmbH; Berlin Germany
Hans Joachim Eichler, Laser- und Medizin- Technologie...$28.00
ICALEO 2011 Paper #M605 (On-Target Fluence Variation in a Multi-Magnification Laser Ablation System)
On-Target Fluence Variation in a Multi-Magnification Laser Ablation System
Authors:
Chen-Hsiung Cheng, Resonetics, LLC; Nashua NH USA
Sergey Broude, Resonetics, LLC; Nashua NH USA
Presented at ICALEO 2011
An algorithm of calculating fluence on-target in a mask-projection ablation system using an excimer laser will be reported. The algorithm extrapolates and obtains fluencies at multiple magnifications from one measurement at one magnification. To further enhance the capability, one can extend the algorithm to include one full set of fluencies under various pulse energies at one magnification. Our test results illustrate that the correct fluence at any magnification can be simply ...$28.00
ICALEO 2011 Paper #M604 (Applying of Refractive Spatial Beam Shapers with Scanning Optics)
Applying of Refractive Spatial Beam Shapers with Scanning Optics
Authors:
Alexander Laskin, Adloptica Optical Systems GmbH; Berlin Germany
Vadim Laskin, Adloptica Optical Systems GmbH; Berlin Germany
Presented at ICALEO 2011
Using of refractive beam shapers with laser scanning optics is often considered in realizing various industrial laser technologies as well as techniques used in scientific and medical applications. Today the galvo mirror scanners with F-theta, telecentric or other lenses as well as gantry systems are widely used in different applications like micromachining, solar cell manufacturing, microwelding, drilling holes, selective laser melting and others which perform...$28.00
ICALEO 2011 Paper #M603 (Large-Area Production of Dynamically Scaled Microstructures Using Diffractive Optical Elements)
Large-Area Production of Dynamically Scaled Microstructures Using Diffractive Optical Elements
Authors:
Bodo Wojakowski, Laser Zentrum Hannover e.V.; Hannover Germany
Ulrich Klug, Laser Zentrum Hannover e.V.; Hannover Germany
Rainer Kling, Laser Zentrum Hannover e.V.; Hannover Germany
Presented at ICALEO 2011
Drag-reduction of turbine-compressor-blades has been successfully demonstrated by using single-spot picosecond-laser-ablation. To accomplish this goal, small periodic riblets have been scribed into the blades surface parallel to the flow direction to reduce the turbulent airflow within the turbine. This approach is successful but lacks an industry-compatible pr...$28.00
ICALEO 2011 Paper #M602 (Efficient Use of Short Pulse Width Laser for Maximum Material Removal Rate)
Efficient Use of Short Pulse Width Laser for Maximum Material Removal Rate
Authors:
Ashwini Tamhankar, Newport Corporation; Santa Clara CA USA
Rajesh Patel, Newport Corporation; Santa Clara CA USA
Presented at ICALEO 2011
Any high volume laser manufacturing process demands high throughput, improved accuracy, and minimal thermal damage to the target material. The diode pumped solid state (DPSS) Q-switched nanosecond lasers are being used routinely today for many semiconductor & microelectronics and solar cell manufacturing processes. They offer low noise, high stability, and reliability required for a robust manufacturing process. Over the past few years the energy available per pul...$28.00
ICALEO 2011 Paper #M601 (Ultra-Short Pulse Laser Micro-Machining of Metals with Radial and Azimuthal Polarization)
Ultra-Short Pulse Laser Micro-Machining of Metals with Radial and Azimuthal Polarization
Authors:
O.J. Allegre, University of Liverpool; Liverpool Great Britain
W. Perrie, University of Liverpool; -
S.P. Edwardson, University of Liverpool; -
G. Edwardson, University of Liverpool; -
K.G. Watkins, University of Liverpool; -
Presented at ICALEO 2011
Laser-material interactions are known to be strongly influenced by the polarization of the incident laser beam. In particular, polarization affects both the efficiency and the quality of ultra-short pulse micro-processes such as helical drilling and cutting. The potential benefits of using radial ...$28.00
ICALEO 2011 Paper #M506 (A Study of Laser Ablation Near the Critical Point)
A Study of Laser Ablation Near the Critical Point
Authors:
Hyungson Ki, Ulsan National Institute of Science and Technology (UNIST); Ulsan South Korea
Presented at ICALEO 2011
Laser ablation is arguably the most important application areas of pulsed lasers, and is also the foundation of many other applications, such as precision microfabrication and pulsed laser deposition. However, underlying physical phenomena are still far from completely understood because ablation occurs at extremely high temperatures and pressures. In this study, the author investigate laser material interaction with emphasis on how a material behaves near the critical point. Employing temperature-dependent material proper...$28.00
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