• ICALEO 2011 Paper #M503 (Stability Limits of Laser Drilled Hole Arrays On Large Areas)

    Stability Limits of Laser Drilled Hole Arrays On Large Areas
    Authors:
    Nelli Hambach, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Claudia Hartmann, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Jens Holtkamp, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Arnold Gillner, Fraunhofer Institute for Laser Technology ILT; Aachen Germany
    Presented at ICALEO 2011

    Large area micro drilling utilizing short pulsed solid state lasers is becoming an important manufacturing technique in the filtration technology. High transmittance and quality of the drilled holes are the main challenges. Roundness and diameter variation ...

    $28.00

  • ICALEO 2011 Paper #M504 (Experimental Study of Producing Non-Tapered Holes Using a High Peak Power Pulsed Nd:YAG Laser)

    Experimental Study of Producing Non-Tapered Holes Using a High Peak Power Pulsed Nd:YAG Laser
    Authors:
    Li Qiang, Beijing University of Technology; Beijing Peoples Republic of China
    Jiang Meng-hua, Beijing University of Technology; Beijing Peoples Republic of China
    Lei Hong, Beijing University of Technology; Beijing
    Wang Jin-Guo, Beijing University of Technology; Beijing Peoples Republic of China
    Hui Yong-ling, Beijing University of Technology; Beijing Peoples Republic of China
    Presented at ICALEO 2011

    In order to producing parallel holes, a modified pulsed Nd:YAG laser for laser percussion drilling was presented . The resonator-amplifier stru...

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  • ICALEO 2011 Paper #M505 (Laser Ablation: Optimising Material Removal Rate with Limited Oxidation for Ti6Al4V)

    Laser Ablation: Optimising Material Removal Rate with Limited Oxidation for Ti6Al4V
    Authors:
    S. Davies, Swansea University, Rolls-Royce plc; Swansea Great Britain
    J. Kell, Rolls-Royce plc; Derby Great Britain
    M. C. Kong, The University of Nottingham; Nottingham Great Britain
    D. Axinte, The University of Nottingham; Nottingham Great Britain
    K. Perkins, Swansea University; Swansea Great Britain
    Presented at ICALEO 2011

    Laser ablation is a method of removing relatively small volumes of material from a substrate, and this technique is finding a wide range of exploitation avenues in industry; such as large scale paint remover to composite resin rem...

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  • 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...

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  • 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 ...

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  • 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 #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...

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  • 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...

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  • 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 ...

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  • 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

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