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  • ICALEO 2008 Paper #403 (Micromachining of Glass with Short ns-Pulses and Highly Repetitive fs-Laser Pulses)

    Micromachining of Glass with Short ns-Pulses and Highly Repetitive fs-Laser Pulses
    Authors:
    S. Mauersberger, University of Applied Sciences; Mittweida Germany
    U. Loeschner, Hochschule Mittweida University of Applied Sciences; Mittweida Germany
    H. Exner, Hochschule Mittweida University of Applied Sciences; Mittweida Germany
    J. Schille, Hochschule Mittweida University of Applied Sciences; Mittweida Germany
    R. Ebert, Hochschule Mittweida University of Applied Sciences; Mittweida Germany
    P. Regenfuss, Hochschule Mittweida University of Applied Sciences; Mittweida Germany
    L. Hartwig, Hochschule Mittweida University o...

    $28.00

  • ICALEO 2008 Paper #402 (Picosecond Double-Pulse Ablation in Silicon and Aluminium with Variable Delay)

    Picosecond Double-Pulse Ablation in Silicon and Aluminium with Variable Delay
    Authors:
    Oliver Suttmann, Laser Zentrum Hannover E.V.; Hannover Germany
    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
    Andreas Ostendorf, Laser Zentrum Hannover E.V.; Hannover Germany
    Presented at ICALEO 2008

    Solid state picosecond laser sources are reliable tools for micro-ablation in industrial applications. Double-pulse ablation with picosecond pulses is a promising way to maximize the efficiency of the ablation due to plasma and t...

    $28.00

  • ICALEO 2008 Paper #310 (Laser Drilling in Superalloy with 150~550Ns Pulse Train)

    Laser Drilling in Superalloy with 150~550Ns Pulse Train
    Authors:
    Xiaobing Zhang, beijing aeronautical manufacturing technology research institute; Beijing Peoples Republic of China
    V.A. Serebrjakov, Institute for Laser Physics; St. Petersburg Russia
    M.V. Volkov, Institute for Laser Physics; St. Petersburg Russia
    Presented at ICALEO 2008

    This paper introduces the principle and characteristics of an AO Q-switched YAG laser of 100-700ns single pulse duration working in pulse train mode which has been developed specially for making holes with thinner recast. The laser oscillator is composed by a low power AO Q-switched YAG laser of TEM00 mode as seed laser and two amplifie...

    $28.00

  • ICALEO 2008 Paper #309 (Aerospace Applications of Precision Trepanning)

    Aerospace Applications of Precision Trepanning
    Authors:
    Paul Jacobs, LFI Inc.; Smithfield RI USA
    Presented at ICALEO 2008

    In a companion paper Precision Trepanning with a Fiber Laser, analytical constraints were developed leading to criteria for optimal trepanning of very precise holes. That paper also includes recent documented test data verifying these calculations. In this paper, we utilize these optimal fiber laser trepanning results to show the potentially substantial benefits that can accrue for relevant aerospace applications. Specifically, the jet engine selected for the Joint Strike Fighter will require over 1.2 million film cooling holes to operate at the elevated temperatures...

    $28.00

  • ICALEO 2008 Paper #308 (Investigation on the Pulsed Nd:YAG Laser Drilling of IN718)

    Investigation on the Pulsed Nd:YAG Laser Drilling of IN718
    Authors:
    Joonghan Shin, CLAIM, The University of Michigan; Ann Arbor MI USA
    Jyoti Mazumder, CLAIM, The University of Michigan; Ann Arbor MI USA
    Presented at ICALEO 2008

    We report on an experimental study of the pulsed Nd:YAG laser drilling of IN718 for cooling holes in aero-engine components. The holes produced in this study are angled at 30o to the workpiece surface and were mainly produced by a spiral drilling technique. The design of experiment (DOE) using the Taguchi method was employed, and various process parameters such as laser power, drilling speed, assist gas pressure, focal position and a number of drilling passe...

    $28.00

  • ICALEO 2008 Paper #307 (Acoustic Monitoring of Percussion Drilled Holes for Gas Turbine Engine Components)

    Acoustic Monitoring of Percussion Drilled Holes for Gas Turbine Engine Components
    Authors:
    Robert Wright, Connecticut Center for Advanced Technology; East Hartford CT USA
    Christopher Pinciak, University of Massachusetts-Dartmouth; MA USA
    Terri A. Marsico, Connecticut Center for Advanced Technology; East Hartford CT USA
    Paul Denney, Connecticut Center for Advanced Technology; East Hartford CT USA
    Amber Black, University of Connecticut; CT USA
    Presented at ICALEO 2008

    Percussion laser drilling is used to produce cooling holes in gas turbine engine components. Inconsistencies associated with pre-drilling operations make it difficult to cons...

    $28.00

  • ICALEO 2008 Paper #305 (Laser Drilling with Gated High Power Fiber Lasers)

    Laser Drilling with Gated High Power Fiber Lasers
    Authors:
    John Washko, Connecticut Center for Advanced Technology; East Hartford CT USA
    Paul Denney, Connecticut Center for Advanced Technology; East Hartford CT USA
    Terri A. Marsico, Connecticut Center for Advanced Technology; East Hartford CT USA
    Presented at ICALEO 2008

    Flash-lamp pumped Nd:YAG lasers are presently used to percussion drill film cooling holes in gas turbine engine components. These lasers are the most popular lasers for cooling hole drilling because their characteristics result in acceptable processing times and microstructures. These lasers are used to drill through a wide range of material types an...

    $28.00

  • ICALEO 2008 Paper #303 (Precision Trepanning with a Fiber Laser)

    Precision Trepanning with a Fiber Laser
    Authors:
    Paul Jacobs, LFI Inc.; Smithfield RI USA
    Presented at ICALEO 2008

    An analysis is developed to establish the optimal parameters for precision trepanning using a 200 watt average power fiber laser. Recent test results are also presented to document the mean values and standard deviations of fiber laser trepanned holes for a number of materials, hole diameters, and thicknesses. Analytical constraints are established for each of the following: (1) maintaining sufficient laser irradiance to assure rapid trepanning speed without inducing plasma self-absorption, (2) selecting a laser pulse repetition frequency sufficiently high to maintain a molten met...

    $28.00

  • ICALEO 2008 Paper #302 (Investigation of the Laser Drilling Process by Emission Spectroscopy)

    Investigation of the Laser Drilling Process by Emission Spectroscopy
    Authors:
    Robin Bright, University of Connecticut; Storrs CT USA
    Harris Marcus, University of Connecticut; Storrs CT USA
    Mark Aindow, University of Connecticut; Storrs CT USA
    Presented at ICALEO 2008

    Pulsed laser drilling has recently become of increasing importance to the aerospace industry as a method of creating cooling holes in a variety of high temperature gas turbine engine components. The potential for improved processing speed, accuracy, and reproducibility compared to conventional machining methods make laser drilling attractive from both an economic and product quality standpoint. Previous ...

    $28.00

  • ICALEO 2008 Paper #301 (Influence of Process Gas Sort and Pressure on Laser Percussion Drilling)

    Influence of Process Gas Sort and Pressure on Laser Percussion Drilling
    Authors:
    Kurt Walther, Lehrstuhl Fuer Lasertechnik, Rwth Aachen University; Aachen Germany
    Christian Holtkoetter, Lehrstuhl Fuer Lasertechnik, Rwth Aachen University; Aachen Germany
    Ingomar Kelbassa, Lehrstuhl Fuer Lasertechnik, Rwth Aachen University; Aachen Germany
    Reinhart Poprawe, Lehrstuhl Fuer Lasertechnik, Rwth Aachen University; Aachen Germany
    Presented at ICALEO 2008

    Providing the technology to achieve an efficiency of 65 % in natural gas-fired combined cycle power plants is the aim of the German Collaborative Research Center 561 Thermally highly loaded, porous and cooled m...

    $28.00

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