• ICALEO 2009 Paper #208 (Modification of the Electrochemical Properties of 2050-T8 Aluminium Alloys by a LSP Surface Treatment)

    Modification of the Electrochemical Properties of 2050-T8 Aluminium Alloys by a LSP Surface Treatment
    Authors:
    Patrice Peyre, LALP (CRNS)/GIP Gerailp, UPR 1578; PARIS France
    Vincent Vignal, ICB, UMR 5209 CNRS-Université de Dijon; - France
    Hassan Amar, ICB, UMR 5209 CNRS; - France
    Hongbin Song, LIM, UMR 8006 CNRS-Arts et Métiers; - France
    Hervé Pelletier, LGECO, EA 3938, INSA de Strasbourg; - France
    Vincent Ji, ICMMO/LEMHE, UMR CNRS 8182; - France
    Presented at ICALEO 2009

    2050 is a newly developed aeronautical AlLiCu aluminium alloys with numerous applications such as fuselage of civil aircrafts, and a good mechanical resistance...

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  • ICALEO 2009 Paper #301 (Solutions for Lasers with High Brightness - A Deeper Look into Processing Heads for Welding and Cutting)

    Solutions for Lasers with High Brightness – A Deeper Look into Processing Heads for Welding and Cutting
    Authors:
    Markus Kogel-Hollacher, Precitec Optronik GmbH; Rodgau Germany
    Juergen Mueller-Borhanian, Precitec Kg; Gaggenau Germany
    Christian Staudenmaier, Precitec Kg; Gaggenau Germany
    Bert Schuermann, Precitec Kg; Gaggenau Germany
    Brad Trees, Precitec Inc.; Wixom MI USA
    Presented at ICALEO 2009

    Excellent beam qualities of the latest generation of laser sources like fibre and disc lasers in the region up to 2.5mm mrad and a laser power in the region of several kW enable new possibilities in laser materials processing. These constraints put h...

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  • ICALEO 2009 Paper #302 (Disk Laser: A New Generation of Industrial Laser)

    Disk Laser: A New Generation of Industrial Laser
    Authors:
    David Havrilla, TRUMPF Inc.; Plymouth MI USA
    Ruediger Brockmann, Trumpf Laser Gmbh; Schramberg Germany
    Presented at ICALEO 2009

    While the Disk laser concept was invented in the early 90s, the first industrial products were available in the beginning of this decade. Since then, the disk laser is used in mass production and serves a large variety of application fields. The output power per disk has continually increased and reached a level of 2.5 kW per disk in 2007. As of today, the disk principle has not reached any fundamental limit regarding output power per disk or beam quality. In 2009 TRUMPF released a new series of in...

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  • ICALEO 2009 Paper #303 (CW and Q-switched Yb-doped Single-Mode Fiber Lasers at 980 nm and their Frequency Doubling with BiBO)

    CW and Q-switched Yb-doped Single-Mode Fiber Lasers at 980 nm and their Frequency Doubling with BiBO
    Authors:
    Pingxue Li, Beijing University of Technology; Beijing Peoples Republic of China
    Shuzhen Zou, Institue of Laser Engineering; Beijing Peoples Republic of China
    Xuexia Zhang, -; -
    Presented at ICALEO 2009

    In this paper, we demonstrated a single-mode Yb-doped fiber laser at 980nm pumped by cw and Q-switched 946 nm Nd:YAG laser. The Yb-doped fiber laser adopting two 0° fiber ends as cavity mirrors generated a cw output power of 1.32 W at 980 nm with the slope efficiency of 75.3%. The corresponding optical conversion efficiency was 66% from the incident pump power ...

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  • ICALEO 2009 Paper #305 (Research on Mechanism of Mode-Locking using Semiconductor of Saturable Absorption Mirror in a Solid Laser)

    Research on Mechanism of Mode-Locking using Semiconductor of Saturable Absorption Mirror in a Solid Laser
    Authors:
    Jie Fu, Beijing University of Technology; Beijing Peoples Republic of China
    Bingyuan Zhang, Liaocheng University; Liaocheng Peoples Republic of China
    Meng Chen, Beijing University of Technology; Beijing Peoples Republic of China
    Gang Li, Beijing University of Technology; Beijing Peoples Republic of China
    Presented at ICALEO 2009

    In this paper, the mechanism of mode-locking using a semiconductor saturable absorption mirror (SESAM) in solid laser was analyzed by half-classical theory. We proposed a new opinion about how the SESAM works to realiz...

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  • ICALEO 2009 Paper #306 (Characterization of Laser Beam Intensity used for Machining)

    Characterization of Laser Beam Intensity used for Machining
    Authors:
    Mon Thet Thet, Universiti Malaysia Pahang; Kuantan Malaysia
    Nafrizuan Mat Yahya, Universiti Malaysia Pahang; Kuantan Malaysia
    S. Azlyna, Universiti Malaysia Pahang; Kuantan Malaysia
    Presented at ICALEO 2009

    Lasers have been increasingly used for machining of various materials. One of the problems with laser machining is unwanted heat-affected zone, which downgrades the quality of the cut surface. Such heat-affected zone occurs very often due to lack of information on the characteristics of the beam intensity. The objective of this research is to develop a model that explains the characteristic of the...

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  • ICALEO 2009 Paper #307 (Collimated Laser Homogenizer)

    Collimated Laser Homogenizer
    Authors:
    Michael Scaggs, Neoteric Concepts; Weston FL USA
    Gil Haas, Haas Laser Technologies, Inc; Flanders NJ USA
    Presented at ICALEO 2009

    A new laser beam homogenizer has been developed which converts a highly spatial coherent, Gaussian laser beam into a collimated, square homogenized field. The optical device converts a lasers Gaussian input beam through multiplexing and recombination without optical interference and yet is collimated over > 5 meters. Laser beam property variations do not adversely affect the performance of the homogenizer in contrast to phase shifting homogenizers and can be utilized from the lasers objective lens entrance...

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  • ICALEO 2009 Paper #401 (Statistical Analysis of Low Porosity Laser Welding of Ti Alloys using a Directed Gas Jet)

    Statistical Analysis of Low Porosity Laser Welding of Ti Alloys using a Directed Gas Jet
    Authors:
    Jonathan Blackburn, The University of Manchester; Manchester Great Britain
    Chris Allen, TWI Ltd; Cambridge Great Britain
    Paul Hilton, TWI Ltd; Cambridge Great Britain
    Lin Li, The University of Manchester; Manchester Great Britain
    Presented at ICALEO 2009

    Titanium alloys are increasingly utilized in the aerospace sector as a result of their high specific strength, fatigue performance and corrosion resistance. It has been reported previously by the authors that high quality, low internal porosity content welds can be made in titanium alloys using near-infrared l...

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  • ICALEO 2009 Paper #403 (Weld Strength Improvement for Al Alloy by using Laser Weaving Method)

    Weld Strength Improvement for Al Alloy by using Laser Weaving Method
    Authors:
    Kwang-Deok Choi, -; -
    Young-Nam Ahn, -; -
    Cheolhee Kim, KITECH; Yeonsu-gu South Korea
    Presented at ICALEO 2009

    In Al alloy welding, the linear laser welds have the shear-tensile strength lower than that of the base metal because of porosities and cracks resulting from unstable keyhole and high crack sensitivity. Various techniques have been introduced to improve the joint strength of laser welds and the laser weaving is also an alternative. In this research, Al alloy sheets were used as the base material with a thickness of 1mm, and lap welding and bead-on-plate crack test were implemented...

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  • ICALEO 2009 Paper #404 (Laser Beam Welding with Hypereutectic ALSI Filler Material)

    Laser Beam Welding with Hypereutectic ALSI Filler Material
    Authors:
    Thomas Seefeld, BIAS; Bremen Germany
    Frank Buschenhenke, Bias; Bremen Germany
    Frank Vollertsen, Bias; Bremen Germany
    Presented at ICALEO 2009

    For laser welding of AlMgSi (6xxx) alloys filler alloys are commonly required to reduce the hot cracking susceptibility by rising the silicon content in the weld pool to a non critical value. For slender welds obtained e.g. in welding with high brightness lasers, this is often difficult to achieve. The use of hypereutectic Al-Si filler materials might be helpful; however these fillers are not readily available in the form of thin wire. In the present work, hypere...

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