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...

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...

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 ...

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...

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...

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...

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...

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...

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...

ICALEO 2009 Paper #405 (Study on Welding of 2024 Aluminum Alloy Sheet with Disc Laser)

Study on Welding of 2024 Aluminum Alloy Sheet with Disc Laser
Authors:
Xudong Zhao, Beijing University of Technology; Beijing Peoples Republic of China
Rongshi Xiao, Beijing University of Technology; Beijing Peoples Republic of China
Kai Chen, Beijing University of Technology; Beijing Peoples Republic of China
Presented at ICALEO 2009

In the fields of medical equipment manufacturing and aerospace engineering, aluminum alloys are widely applied to make the shells of the electronic devices. Laser welding is considered as a suitable technology to produce those components for the lower heat input and higher joint strength. In this paper, a 4.0kW disc laser was used to weld...