• ICALEO 2007 Paper #M1307 (Fiber Laser Welding of High Integrity Implantable Medical Devices)

    Fiber Laser Welding of High Integrity Implantable Medical Devices
    Authors:
    Serdar Unal, St. Jude Medical; Sylmar CA USA
    Sergey Safarevich, St. Jude Medical; Sylmar CA USA
    Silke Pflueger, SPI Lasers; Los Gatos CA USA
    Tony Hoult, SPI Lasers; Santa Clara CA USA
    David Braman, Crafford-LaserStar Technologies; Riverside RI USA
    Presented at ICALEO 2007

    Medical implantable devices like pacemakers, ICDs and leads are progressively becoming more compact
    and lighter. Some of the components used for hermetic and structural welding are still large and thick
    enough for conventional Nd:YAG pulsed lasers. However, some of the welded components, particula...

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  • ICALEO 2007 Paper #M301 (In-Process Monitoring and Adaptive Control in 100W Fiber Laser Welding)

    In-Process Monitoring and Adaptive Control in 100W Fiber Laser Welding
    Authors:
    Yousuke Kawahito, Osaka University; Ibaraki Japan
    Masaharu Kawasaki, Osaka unversity; Ibaraki Japan
    Seiji Katayama, Osaka unversity; Ibaraki Japan
    Presented at ICALEO 2007

    A fiber laser is easily applied for micro welding owing to the excellent beam quality. Moreover, hand, a fiber laser is expected to be a promising heat source for adaptive control since the peak power is variable within sub-micro-second period. The objective of the research was to develop a new laser system with in-process monitoring and adaptive control for the stable production of sound welds in thin sheets. The bead...

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  • ICALEO 2007 Paper #M302 (Laser Micro-Perforation "On-The-Fly" As an Essential Step of a Novel Process Combination for Micro-Sieve Production)

    Laser Micro-Perforation “On-The-Fly“ As an Essential Step of a Novel Process Combination for Micro-Sieve Production
    Authors:
    Frank Vollertsen, BIAS - Bremer Institut fuer angewandte Strahltechnik GmbH; Bremen Germany
    Klaus Dickmann, Laser Center University of Applied Sciences Muenster; Steinfurt Germany
    Marc Baumeister, Laser Center University of Applied Sciences Muenster; Steinfurt Germany
    Presented at ICALEO 2007

    A novel two-step technique, capable of performing large bore matrices in thin stainless steel foils is maintaining high processing rates and bore widths <5µm. This process combination is initiated by high-speed single-pulse perforation “on-the-fly” ...

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  • ICALEO 2007 Paper #M303 (Micromachining Performance Comparison Between a Pulsed Nd: YAG Laser and a Single Mode Fiber Laser Up to 100W Average Power)

    Micromachining Performance Comparison Between a Pulsed Nd: YAG Laser and a Single Mode Fiber Laser Up to 100W Average Power
    Authors:
    Mohammed Naeem, GSI Group, Inc. - Laser Division; Rugby Great Britain
    Steffan Lewis, GSI Group, Inc. - Laser Division; Warwickshire Great Britain
    Presented at ICALEO 2007

    Many applications in the electronics, telecom, automotive and medical industry require either drill small holes, cut small features or join small parts. As these devices are getting smaller and smaller, micromachining becoming more and more important. For micromachining applications it is very important to have a laser, which has a very good beam quality to produce small spot size, a...

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  • ICALEO 2007 Paper #M304 (Local Heating System using a Fiber Laser for Controlling Microstructures)

    Local Heating System using a Fiber Laser for Controlling Microstructures
    Authors:
    Masahiro Tsukamoto, Joining and Welding Research Institute, Osaka University; Ibaraki, Osaka Japan
    Toshiya Shibayanagi, Joining and Welding Research Institute, Osaka University; Ibaraki, Osaka Japan
    Hitoshi Nakano, Kinki University; Osaka Japan
    Takuto Yamashita, Osaka University; Suita, Osaka Japan
    Yukihiro Soga, Osaka University; Suita, Osaka Japan
    Nobuyuki Abe, Joining and Welding Research Institute, Osaka University; Ibaraki, Osaka Japan
    Presented at ICALEO 2007

    Conventional heat treatments utilizing homogeneous temperature fields that have been c...

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  • ICALEO 2007 Paper #M403 (Possibility of Producing a Superconductive Layer of Large Area on the Bulk Prepared by Press Forming of Bi System Superconductive Powder by Laser Surface Melting Method)

    Possibility of Producing a Superconductive Layer of Large Area on the Bulk Prepared by Press Forming of Bi System Superconductive Powder by Laser Surface Melting Method
    Authors:
    Hiroyuki Shimizu, Nippon institute of Technology; Saitama Japan
    Hajime Miyazawa, Nippon Institute of Technology; Saitama Japan
    Katsuyoshi Hotta, Nippon Institute of Technology; Saitama Japan
    Presented at ICALEO 2007

    A bulk prepared by press forming of Bi system superconductive powder never shows superconductive characteristics. To yield superconductive characteristics on the bulk, heat treatment of the bulk in an electric furnace is an essential process. This process, however, has such problems...

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  • ICALEO 2007 Paper #M404 (Surface Structuring of Polyimide by Pulsed Laser Ablation)

    Surface Structuring of Polyimide by Pulsed Laser Ablation
    Authors:
    Rui Vilar, Instituto Superior Tnico; Lisboa Portugal
    Victor Oliveira, Instituto Superior T�Cnico; Lisboa PA Portugal
    Presented at ICALEO 2007

    Laser ablation has been extensively studied in polymers because of their considerable utility in diverse fields such as medicine, microelectronics, photonics, etc. Among the many aspects of laser ablation of polymers, several authors have reported the formation and growth of conical structures during laser processing with UV laser radiation. In the present paper, polyimide surfaces were processed with pulsed KrF laser radiation at fluences near the ablation threshold of t...

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  • ICALEO 2007 Paper #M405 (Micro-scale Laser Peen Forming of a Single Crystal)

    Micro-scale Laser Peen Forming of a Single Crystal
    Authors:
    Youneng Wang, Michelin America R&D Corp.; Greenville SC USA
    Yajun Fan, Columbia University; New York NY USA
    Jeffrey Kysar, Columbia University; New York NY USA
    Sinisa Vukelic, Columbia University; New York NY USA
    Y. Lawrence Yao, Columbia University; New York NY USA
    Presented at ICALEO 2007

    As the result of quickly increased requirement in many industrial products resulting from microtechnology, laser thermal micro-forming and micro surface treatment (microscale laser shock peening (LSP)) have been well studied. By combing the beneficial effects of these two processes with a cont...

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  • ICALEO 2007 Paper #M406 (Melt-Mediated Laser Crystallization of Thin Film NiTi Shape Memory Alloys)

    Melt-Mediated Laser Crystallization of Thin Film NiTi Shape Memory Alloys
    Authors:
    Ainissa Ramirez, Yale University; New Haven CT USA
    Andrew Birnbaum, Columbia University; New York NY USA
    Ui-Jin Chung, Columbia University; New York NY USA
    Xu Huang, Yale University; New Haven CT USA
    Sean Polvino, Columbia University; New York NY USA
    Y. Lawrence Yao, Columbia University; New York NY USA
    Presented at ICALEO 2007

    This work utilizes pulsed, melt-mediated laser crystallization techniques to control the spatial distribution of crystalline zones within an as sputter-deposited amorphous matrix. Since shape memory responses stem from crys...

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  • ICALEO 2007 Paper #M501 (Laser Assisted Maskless Microdeposition for Conformal Direct Writing of Optical Fibers)

    Laser Assisted Maskless Microdeposition for Conformal Direct Writing of Optical Fibers
    Authors:
    Hamidreza Alemohammad, University of Waterloo; Waterloo ON Canada
    Ehsan Toyserkani, University of Waterloo; Waterloo ON Canada
    Presented at ICALEO 2007

    Metallic coatings can improve both sensitivity and mechanical strength of optical fiber sensors (e.g., fiber Bragg grating sensors). Fiber Bragg grating is a periodic modulation in the index of refraction in the core of optical fiber, which can be used for monitoring of physical parameters like strain, temperature and pressure. Deposition of metallic layers on FBGs with specific patterns can improve their sensitivity for measurement of ph...

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