ICALEO 2010 Paper #P142 (Photoconductive Properties of Titanium Dioxide Film by Femtosecond Laser Irradiation)

Photoconductive Properties of Titanium Dioxide Film by Femtosecond Laser Irradiation
Authors:
Teppei Nomura, Graduate School of Enginering, Osaka University; Suita, Osaka Japan
Masahiro Tsukamoto, Joining and Welding Research Institute Osaka University; Ibaraki, Osaka Japan
Masanari Takahashi, Osaka Municipal Technical Research Institute; Osaka, Japan Japan
Masayuki Fujita, Institute for Laser Technology; Osaka, Japan Japan
Nobuyuki Abe, Joining and Welding Research Institute Osaka University; Ibaraki, Osaka Japan
Presented at ICALEO 2010

Titanium dioxide (TiO2) is functional ceramics and shows the photoconductive property by ultraviolet (UV) ...

ICALEO 2010 Paper #P141 (Correlation Between Computer-Based Simulation Model and Practice of High-Speed Laser Welding of Polycarbonate)

Correlation Between Computer-Based Simulation Model and Practice of High-Speed Laser Welding of Polycarbonate
Authors:
Heidi Piili, Lappeenranta University of Technology, Laser Processing Technology Research Group; Lappeenranta Finland
Lauri Taimisto, Lappeenranta University of Technology, Laser Processing Technology Research Group; Lappeenranta Finland
Tuomas Purtonen, Lappeenranta University of Technology, Laser Processing Technology Research Group; Lappeenranta Finland
Saara Ruotsalainen, VTT Technical Research Centre of Finland; Lappeenranta Finland
Petri Laakso, VTT Technical Research Centre of Finland; Lappeenranta Finland
Antti Salminen, Lap...

ICALEO 2010 Paper #P139 (Color Change in Laser Cutting of Paper Material)

Color Change in Laser Cutting of Paper Material
Authors:
Alexander Stepanov, Lappeenranta University of Technology, Faculty of Technology, Laser Processing Research Group (Laboratory of Welding Technology and Laser Processing); Lappeenranta Finland
Heidi Piili, Lappeenranta University of Technology, Faculty of Technology, Laser Processing Research Group (Laboratory of Welding Technology and Laser Processing); Lappeenranta Finland
Antti Salminen, Lappeenranta University of Technology, Faculty of Technology, Laser Processing Research Group (Laboratory of Welding Technology and Laser Processing); Lappeenranta Finland
Presented at ICALEO 2010

Laser technology has been deve...

ICALEO 2010 Paper #P134 (Automatic Real-Time Guidance of Laser Machining with Inline Coherent Imaging)

Automatic Real-Time Guidance of Laser Machining with Inline Coherent Imaging
Authors:
Paul J. L. Webster, Department of Physics, Engineering Physics & Astronomy, Queens University at Kingston; Kingston ON Canada
Logan G. Wright, Department of Physics, Engineering Physics & Astronomy, Queens University at Kingston; Kingston ON Canada
Kevin D. Mortimer, Department of Physics, Engineering Physics & Astronomy, Queens University at Kingston; Kingston Canada
Ben Y. Leung, Department of Physics, Engineering Physics & Astronomy, Queens University at Kingston; Kingston ON Canada
Joe X. Z. Yu, Department of Physics, Engineering Physics & Astronomy, Queens University at K...

ICALEO 2010 Paper #P133 (Comparison of the Modeling and Experimental Data of UV Laser Drilled Microhole Profiles in the First Region)

Comparison of the Modeling and Experimental Data of UV Laser Drilled Microhole Profiles in the First Region
Authors:
Frank Wu, Metrolaser Inc; Irvine CA USA
Presented at ICALEO 2010

In this paper, it has been developed a model describing UV laser microhole drilling process, which can predict the drilled microhole profiles for several kinds of specific incident beams. The report tries to answer how the peak fluence, the beam diameter, and the material parameters affect the hole shapes. The model also explains why hole drilling will stop under certain circumstances, i.e., under certain circumstance, more shots applied to the process will not generate any further drilling effect--a stabilized or...

ICALEO 2010 Paper #P132 (A Modeling of UV Laser Drilled Microhole Profiles)

A Modeling of UV Laser Drilled Microhole Profiles
Authors:
Frank Wu, Metrolaser Inc; Irvine CA USA
Presented at ICALEO 2010

In this paper, it has been developed a model describing UV laser microhole drilling process, which can predict the drilled microhole profiles for several kinds of specific incident beams. The report tries to answer how the peak fluence, the beam diameter, and the material parameters affect the hole shapes.

The model also explains why hole drilling will stop under certain circumstances, i.e., under certain circumstance, more shots applied to the process will not generate any further drilling effect--a stabilized or saturated drilling happens. High efficient laser proc...

ICALEO 2010 Paper #P126 (Versatile Cutting and Welding using Beam Optimised High Brightness Fiber Lasers)

Versatile Cutting and Welding using Beam Optimised High Brightness Fiber Lasers
Authors:
Paul Harrison, Spi Lasers; Southampton Great Britain
Andy Appleyard, Spi Lasers; Southampton Great Britain
Presented at ICALEO 2010

Typically, most laser workstations are limited to only one type of process such as welding, cutting or marking. However, when processing thinner sheet metals, there are clear advantages to using one laser for multiple applications, including both cutting and welding. In the past fiber laser cutting and welding has been well established for sheet metals with thicknesses below 3 mm, however these processes need different process parameters, requiring very different w...

ICALEO 2010 Paper #P120 (Ultra Short Laser Pulse Generation of Anti-Ice Surfaces)

Ultra Short Laser Pulse Generation of Anti-Ice Surfaces
Authors:
Daniel Arnaldo del Cerro, University of Twente, Faculty Engineeing Technology, Chair of Applied Laser Technology; - Netherlands
G.R.B.E. Römer, University of Twente, Faculty of Engineering Technology, Chair of Applied Laser Technology; Enschede Netherlands
A.J. Huis in 't Veld, University of Twente, Faculty Engineeing Technology, Chair of Applied Laser Technology / TNO Science & Industry Department Materials Technology; Enschede Netherlands
Presented at ICALEO 2010

Wetting properties of many materials can be changed by accurate laser micromachining with ultra short laser pulses (USLP). USLP machining pro...

ICALEO 2010 Paper #P119 (Focal Plane Considerations for Fiber Laser Wide Field Processing)

Focal Plane Considerations for Fiber Laser Wide Field Processing
Authors:
Mark Brodsky, SPI Lasers LLC; Santa Clara CA USA
Jack Gabzdyl, SPO Lasers UK Limited; Southampton
Presented at ICALEO 2010

Scan heads now are replacing processing traditionally done with fixed head optics using X-Y tables One reason is that fiber lasers offer opportunities to direct intense energy through scan heads over wide marking fields now exceeding 200mm square. Additionally the availability of fiber lasers with increased divergence provides a better application of consistent power across a large mark. This is especially useful for applications such as anneal marking, remote welding, and vapor pres...

ICALEO 2010 Paper #P118 (High Efficiency Gas Assisted Cutting (HEGAC) with Yb-Fibre Laser)

High Efficiency Gas Assisted Cutting (HEGAC) with Yb-Fibre Laser
Authors:
Ali Khan, The Welding Institute (TWI); Cambridge Great Britain
Martin Sparkes, The Institute of Manufacturing (IFM), University of Cambridge; Cambridge Great Britain
Bill Oneill, The Institute of Manufacturing (IFM), University of Cambridge; Cambridge Great Britain
David Richardson, Optoelectronic Research Centre (ORC), University of Southampton; Southampton Great Britain
Presented at ICALEO 2010

The arrival of Yb fibre laser technology provides an opportunity to further reduce the optical energy requirements for thick-section oxygen assisted laser cutting of low carbon mild steel. T...