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...

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...

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...

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...

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” ...

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...

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...

ICALEO 2007 Paper #M1306 (Picosecond Laser Micromachining of Biomedical Materials)

Picosecond Laser Micromachining of Biomedical Materials
Authors:
Assi Huttunen, Tampere University of Technology; FIN-33101 Tampere Finland
Petri Laakso, VTT Technical Research Centre of Finland; Lappeenranta Finland
Minna Kellomäki, Tampere University of Technology; Tampere Finland
Riku Heikkilä, Tampere University of Technology; Tampere Finland
Ville Ellä, Tampere University of Technology; Tampere Finland
Presented at ICALEO 2007

In this work, biodegradable polymers and bioactive glass were micro machined by UV-laser for application in biomedical engineering. Studied materials were poly(lactide-co-glycolide) (PLGA), drug loaded PLGA, orie...

ICALEO 2007 Paper #M1305 (Influence of Femtosecond Laser Irradiation on Amino Acid)

Influence of Femtosecond Laser Irradiation on Amino Acid
Authors:
Hitoshi Nakano, KINKI university; OSAKA Japan
Masahiro Tsukamoto, Joining and Welding Research Institute, Osaka University; Osaka Japan
Norimitsu Tamai, KINKI university; OSAKA Japan
Nobuyuki Abe, Joining and Welding Research Institute, Osaka University; Osaka Japan
Presented at ICALEO 2007

Problems such as genetic damage should be considered in the medical application of lasers. Photochemical damage to living tissue is caused by high-photon energy light. Influence of femtosecond laser irradiation on amino acid is investigated in the present study. Ultraviolet absorption spectra of amino aci...

ICALEO 2007 Paper #M1304 (Laser Micromachining of Surface Pores on Ti for Biomedical Application)

Laser Micromachining of Surface Pores on Ti for Biomedical Application
Authors:
HC Man, Hong Kong Polytechnic University; Kowloon Hong Kong
Q Wang, The Hong Kong Polytechnic University; kowloon Hong Kong
X Guo, The Hong Kong Polytechnic University; Kowloon Hong Kong
Presented at ICALEO 2007

The surface condition of a dental implant affects the performance of tissue integration and its stability. In order to enhance these issues, laser texturing the surface of Titanium dental implants have been investigated by many researchers. Most of these studies involved texturing of dimples or drilling of surface blind pores at regular interval. This paper reports a new method to p...