• PICALO 2006 Paper #M206 (Point by Point Femtosecond Laser Inscription of Fibre and Waveguide Bragg Gratings for Photonic Device Fabrication)

    Point by Point Femtosecond Laser Inscription of Fibre and Waveguide Bragg Gratings for Photonic Device Fabrication
    Authors:
    Graham Marshall, centre for Lasers and Applications, Macquarie University; Sydney Australia
    Martin Ams, centre for Lasers and Applications, Macquarie University; North Ryde Australia
    Michael Withford, Centre for Lasers and Applications, Macquarie University; Sydney Australia
    Presented at PICALO 2006

    We present a flexible and rapid method for the production of Bragg gratings in a range of optical waveguides such as optical fibres and direct laser-written waveguides in bulk media. Using a low repetition rate (1 kHz) femtosecond laser, Bragg grating ...

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  • PICALO 2006 Paper #M204 (Fibre Bragg Grating Fabrication in Germanosilicate Fibres with 244nm Femtosecond Laser Light)

    Fibre Bragg Grating Fabrication in Germanosilicate Fibres with 244nm Femtosecond Laser Light
    Authors:
    A. Canagasabey, ORC, University of Southampton; Southampton AB Great Britain
    J. Mills, ORC, University of Southampton; Southampton Great Britain
    John Canning, University of Sydney; Sydney Australia
    D.P. Banks, ORC, University of Southampton; Southampton Great Britain
    M. Ibsen, ORC, University of Southampton; Southampton Great Britain
    Presented at PICALO 2006

    The ability to fabricate strong and extraordinarily stable Bragg gratings in any type of fibre using femtosecond laser light has attracted much interest in the recent past. The induced ind...

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  • PICALO 2006 Paper #M203 (Void Generation and Three-dimensional Photonic Crystal Fabrication in a Lithium Niobate Crystal by Use of Micro-explosion)

    Void Generation and Three-dimensional Photonic Crystal Fabrication in a Lithium Niobate Crystal by Use of Micro-explosion
    Authors:
    Guangyong Zhou, Swinburne University of Technology; Hawthorn, VIC Australia
    Min Gu, Swinburne University of Technology; Hawthorn Australia
    Presented at PICALO 2006

    Smooth void dots and void channels have been generated efficiently in some low refractive index materials such as polymers and glasses by use of a femtosecond laser induced microexplosion method and have been used to fabricate 3D photonic crystals. In order to get complete bandgap, a high refractive index material need to be used. Lithium niobate (LiNbO3) crystal is a good candidate because o...

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  • PICALO 2006 Paper #M202 (Topographical Electrodes for Poling Lithium Niobate)

    Topographical Electrodes for Poling Lithium Niobate
    Authors:
    Benjamin Johnston, Macquarie University; Macquarie Australia
    Michael Withford, Macquarie University; Macquarie Australia
    Presented at PICALO 2006

    Periodically poled materials continue to be of great interest due to their applications in both bulk nonlinear optics and all-optical processing systems. Many groups continue to explore alternative techniques to lithographic surface electrodes for defining the domain pattern. The key objectives of these studies are to reduce the minimum domain size, produce uniformity in the domain structures and improve the cost effectiveness and speed of fabrication. We report progress on an...

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  • PICALO 2006 Paper #M108 (Writing Waveguide in Photosensitive Glass Using Ultrafast Laser)

    Writing Waveguide in Photosensitive Glass Using Ultrafast Laser
    Authors:
    D.K.Y. Low, Singapore Institute of Manufacturing Technology; Singapore
    K.J. Moh, Nanyang Technological Univ.; Singapore
    Zhongli Li, SIMTech; Singapore
    G.C. Lim, Singapore Institute of Manufacturing Technology; Singapore
    Presented at PICALO 2006

    We report two methods of fabricating waveguides in photosensitive Ag+ doped Foturan glass by femtosecond (fs) laser writing and subsequent annealing. The first method, which involved writing at laser energy higher than the optical breakdown threshold, resulted in microstructural changes and a refractive index increase. In contrast, the ...

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  • PICALO 2006 Paper #M107 (Laser Beam Micro-Welding with Single Mode Fibre Lasers)

    Laser Beam Micro-Welding with Single Mode Fibre Lasers
    Authors:
    Florian Wagner, BIAS Bremer Institut Fuer Angewandte Strahltechnik; Bremen Germany
    Harald Kohn, BIAS; Germany
    Presented at PICALO 2006

    Single mode fibre lasers enable the welding of thin sheet materials. Although laser power is comparably low, the excellent beam quality of M2

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  • PICALO 2006 Paper #M105 (A Process Study of Laser Micro-Drilling Vias for Wafer Level Chip Scale Packaging)

    A Process Study of Laser Micro-Drilling Vias for Wafer Level Chip Scale Packaging
    Authors:
    Hong Yu Zheng, Singapore Institute of Manufacturing Technology; Singapore
    Presented at PICALO 2006

    Along with the trends of the product minimization, wafer level chip scale package (WLCSP) has become a new solution to advanced packaging. Formation of micro-vias with desired patterns is a critical process step. Currently micro-vias are achieved through photolithographic technology, which is lengthy, time-consuming and costly. In order to improve the productivity and reduce the cost of the via formation process, it is critical to develop a simpler and more cost-effective drilling technology. The successfu...

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  • PICALO 2006 Paper #M104 (Laser Replication Process using Photo-etchable Glass-ceramics and Polymers)

    Laser Replication Process using Photo-etchable Glass-ceramics and Polymers
    Authors:
    Joohan Kim, Seoul National University of Technology; Seoul Korea
    Xianfan Xu, Purdue University; Lafayette IN USA
    Presented at PICALO 2006

    Micro fluidic devices are widely used as typical micro devices and they have many applications in clinical diagnostics, drug delivery and micro electronics cooling. A micro replication process can be used for fabricating micro fluidic devices and a laser replication process using glass-ceramics and polymers is investigated in this work. This process is based on the micro stamping replication process, also referred to as hot embossing lithography. A glass-ceramic m...

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  • PICALO 2006 Paper #M103 (Micro Joining of Dissimilar Metals with a Pulsed Nd:Yag Laser)

    Micro Joining of Dissimilar Metals with a Pulsed Nd:Yag Laser
    Authors:
    Mohammed Naeem, GSI Group, Inc.; Rugby Great Britain
    Presented at PICALO 2006

    Majority of applications in electronics, medical devices industry requires micro joining of dissimilar materials. In principle, a laser can weld any material, which can be joined by conventional processes. In the welding of dissimilar metals, good solid solubility is essential for sound weld properties. The trends of joining dissimilar metals and miniaturisation of components are offering high challenges for welding methods. The weldability of dissimilar metals depends on many different factors. The physical properties have a high influence on the...

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  • PICALO 2006 Paper #M102 (Micro Laser Sintering (microLS) for Rapid Prototyping of Metal-ceramics)

    Micro Laser Sintering (microLS) for Rapid Prototyping of Metal-ceramics
    Authors:
    Peter Stippler, Laser Zentrum Hannover e.V.; Hannover Germany
    Stefan Czerner, Laser Zentrum Hannover e.V.; Hannover Germany
    Andreas Ostendorf, Laser Zentrum Hannover e.V.; Hannover Germany
    Paolo Matteazzi, CSGI and MBN; Florence Italy
    Gerrit Hohenhoff, Laser Zentrum Hannover e.Z.; Hannover Germany
    Presented at PICALO 2006

    The world market for micro system technology is constantly raising the technical demands for the production of metallic tools or functional parts. Currently, the methods of the rapid prototyping area are in relation to the product development on...

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