• ICALEO 2009 Paper #C204 (Advanced Beam Steering in Helical Drilling)

    Advanced Beam Steering in Helical Drilling
    Authors:
    Henrikki Pantsar, Fraunhofer Usa, Inc.; Plymouth MI USA
    Petri Laakso, Vtt Technical Research Centre of Finland; Lappeenranta Finland
    Mika Aikio, Vtt Technical Research Centre of Finland; Oulu Finland
    Jouni Huopana, Vtt Technical Research Centre of Finland; Oulu Finland
    Hans Herfurth, Fraunhofer Usa, Inc.; Plymouth MI USA
    Stefan Heinemann, Fraunhofer Usa, Inc.; Plymouth MI USA
    Presented at ICALEO 2009

    Helical laser drilling is a method for producing high quality holes with defined geometries in different materials among industries such as aerospace, medical device manufacturing an...

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  • ICALEO 2009 Paper #C205 (Ultra Short Pulse Laser Generated Surface Textures for Anti-Ice Applications in Aviation)

    Ultra Short Pulse Laser Generated Surface Textures for Anti-Ice Applications in Aviation
    Authors:
    Gert-willem Romer, University of Twente; Enschede Netherlands
    Daniel Arnaldo Del Cerro, University of Twente; Enschede Netherlands
    R.C.J. Sipkema, Lightmotif B.V.; Enschede` Netherlands
    M.N.W. Groenendijk, Lightmotif B.V.; Enschede Netherlands
    A.J. Huis in 't Veld, University of Twente; Enschede Netherlands
    Presented at ICALEO 2009

    By laser ablation with ultra short laser pulses in the pico- and femto-second range, well controlled superimposed micro- and nano-scaled surface textures can be obtained. The micro-scale of the texture is mainly determi...

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  • ICALEO 2009 Paper #M1001 (Electrode Ablation On Piezoelectric Ceramics by ns-Pulsed Laser Ablation For Sensing Applications)

    Electrode Ablation On Piezoelectric Ceramics by ns-Pulsed Laser Ablation For Sensing Applications
    Authors:
    Stephan Kloss, Renishaw Plc.; Edinburgh Great Britain
    Rhodri W.C. Lewis, University of Bath; Bath Great Britain
    Andrew Dent, University of Bath; Bath Great Britain
    Nick Weston, Renishaw Plc.; Edinburgh Great Britain
    Kevyn Jonas, Renishaw Plc.; Wotton-Under-Edge, Gloucestershire Great Britain
    Christopher R. Bowen, University of Bath; Bath Great Britain
    Duncan P. Hand, Heriot Watt University; Edinburgh Great Britain
    Jonathan D. Shephard, Heriot Watt University; Edinburgh Great Britain
    Presented at ICALEO 2009

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  • ICALEO 2009 Paper #M1002 (Self Organized Pattern Induced using Nanosecond Pulsed Laser Processing of Titanium Immersed in Hydrogen Peroxide)

    Self Organized Pattern Induced using Nanosecond Pulsed Laser Processing of Titanium Immersed in Hydrogen Peroxide
    Authors:
    Negar Rasti, University of Waterloo; Waterloo ON Canada
    Ehsan Toyserkani, University of Waterloo; Waterloo ON Canada
    Presented at ICALEO 2009

    Nanosecond pulsed Ytterbium fiber laser with the polarized Gaussian beam, is utilized to form the organized periodic microstructures on the titanium surface in two different medium: air, and hydrogen peroxide (HP). SEM and profilometry analyses are used to compare the structures developed in air and hydrogen peroxide. Immersing the sample in the hydrogen peroxide medium changes the periodic space and the height of the mic...

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  • ICALEO 2009 Paper #M1003 (Visualization of Grain Boundaries by Nanosecond Laser Irradiation for Controlling Microstructures of Metals)

    Visualization of Grain Boundaries by Nanosecond Laser Irradiation for Controlling Microstructures of Metals
    Authors:
    Masahiro Tsukamoto, Joining and Welding Research Institute; Ibaraki, Osaka Japan
    Saburo Yagi, Graduate School of Osaka Univ.; Suita, Osaka Japan
    Toshiya Shibayanagi, Joining and Welding Research Institute; Ibaraki, Osaka Japan
    Masayuki Fujita, Institute for Laser Technology; Suita, Osaka Japan
    Nobuyuki Abe, Joining and Welding Research Institute; Ibaraki, Osaka Japan
    Presented at ICALEO 2009

    Fiber laser spot heating for controlling microstructures is an important technology for production of new functional materials. Function of...

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  • ICALEO 2009 Paper #M1004 (Characterization of Morphology and Mechanical Properties of Glass Interior Irradiated by Femtosecond Laser)

    Characterization of Morphology and Mechanical Properties of Glass Interior Irradiated by Femtosecond Laser
    Authors:
    Hongliang Wang, Columbia University Dept. of Mechanical Eng.; New York NY USA
    Panjawat Kongsuwan, Columbia University Dept. of Mechanical Eng.; New York NY USA
    Sinisa Vukelic, Columbia University Dept. of Mechanical Eng.; New York NY USA
    Y. Lawrence Yao, Columbia University Dept. of Mechanical Eng.; New York NY USA
    Presented at ICALEO 2009

    Femtosecond laser pulses were focused in the interior of bulk fused silica specimen. Proper use of optical and laser processing parameters generated structural rearrangement of the material through a therma...

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  • ICALEO 2009 Paper #M1005 (Surface Stress Modification in Silicon Carbide by Laser Ablation)

    Surface Stress Modification in Silicon Carbide by Laser Ablation
    Authors:
    Ronald Jacobsen, Mound Laser & Photonics Center, Inc.; - USA
    Joseph Randi, Penn State Electro-Optics Center; Freeport Pa PA USA
    Sarah Bertke, Mound Laser & Photonics Center, Inc.; Miamisburg OH USA
    Presented at ICALEO 2009

    We report the use of short pulse laser ablation as a technique for mitigation of near surface stress and damage in SiC. Conventional machining, grinding or polishing of SiC renders a damaged surface layer of depth approximately equal to the final peak-to-valley roughness. This damage layer is comprised of compressive stress and represents a threat to the integrity of the mate...

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  • ICALEO 2009 Paper #M1006 (The Modification of Electric and Photoluminescence Properties of ZnO Thin Films Induced by Laser Irradiation)

    The Modification of Electric and Photoluminescence Properties of ZnO Thin Films Induced by Laser Irradiation
    Authors:
    Yan Zhao, Bejing University of Technology; Beijing Peoples Republic of China
    Yijian Jiang, Bejing University of Technology; Beijing Peoples Republic of China
    Presented at ICALEO 2009

    This paper aims to contribute to the understanding of laser irradiation effect on the electric and photoluminescence (PL) properties, surface morphology of ZnO thin films. By optimizing the laser beam quality and optical system, with changing the laser parameters, the carrier concentration and UV PL intensity of ZnO thin films could be increased and modulated in a wide range. At a moder...

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  • ICALEO 2009 Paper #M1007 (Effects of KrF (248_nm) Excimer Laser Irradiation on Structural and Optical Properties of ZnO Single Crystal)

    Effects of KrF (248_nm) Excimer Laser Irradiation on Structural and Optical Properties of ZnO Single Crystal
    Authors:
    Jie Liu, BeiJing University of Technology; BeiJing Peoples Republic of China
    Yijian Jiang, Beijing University of Technology; Beijing Peoples Republic of China
    Presented at ICALEO 2009

    The properties of ZnO single crystal irradiated by a pulsed 248nm excimer laser have been systematically studied by AFM, XRD, photoluminescence and Raman measurements. It was observed that the surface roughness and the grain size on the surface of the irradiated ZnO crystals became larger, as well as their band-edge (BE) emissions at room temperature were found to become stronger and s...

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  • ICALEO 2009 Paper #M1008 (Wettability Characteristics Variation of PMMA by Means of CO2 Laser Generated Surface Patterns)

    Wettability Characteristics Variation of PMMA by Means of CO2 Laser Generated Surface Patterns
    Authors:
    David Waugh, Loughborough University; Loughborough Great Britain
    Jonathan Lawrence, Loughborough University; Loughborough Great Britain
    Presented at ICALEO 2009

    CO2 lasers can be seen to lend themselves to materials processing applications. These types of lasers have been used extensively in research and industry with the work carried out being well documented. This work investigated the surface modification of PMMA with a CO2 laser in order to vary wettability characteristics. The wettability characteristics of the PMMA were modified by generating a number of patterns of various...

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