PICALO 2008 Paper #M503 (Development and Application of Miniaturized Scanners for Laser Beam Micro Welding)
Development and Application of Miniaturized Scanners for Laser Beam Micro Welding
Authors:
Andrei Boglea, Fraunhofer Institute for Laser Technology; Aachen Germany
Felix Schmitt, Fraunhofer Institute for Laser Technology; Aachen Germany
Max Funck, Fraunhofer Institute for Laser Technology; Aachen Germany
Reinhart Poprawe, Fraunhofer Institute for Laser Technology; Aachen Germany
Presented at PICALO 2008
Nowadays, flexible production systems for the laser joining of micro parts require a higher dynamic and precision, as well as a higher flexibility concerning the working space. The combination of miniaturized scanner-based laser joining systems and high-pe...$28.00
PICALO 2008 Paper #M504 (Parameter Studies of Fibre Laser Micro-Welding of Aisi 316L using Taguchi Method)
Parameter Studies of Fibre Laser Micro-Welding of Aisi 316L using Taguchi Method
Authors:
Chan Chi Wai, AMT Research Center, Dept. of ISE, the HKPolyU; Hong Kong
H.C. Man, AMT Research Center, Dept. of ISE, the HKPolyU; Hong Kong
T.M. Yue, AMT Research Center, Dept. of ISE, the HKPolyU; Hong Kong
Presented at PICALO 2008
This paper discusses the application of the Taguchi experimental design approach in optimizing the key process parameters for micro-welding of thin AISI 316L foil using the 100W CW fibre laser. A L16 Taguchi experiment was conducted to systematically understand how the power, scanning velocity, focus position, gas flow rate and type of shielding ...$28.00
PICALO 2008 Paper #M505 (Micro Welding of Thin Foil with an Elliptical Beam of Direct Diode Lasers (Invited Paper))
Micro Welding of Thin Foil with an Elliptical Beam of Direct Diode Lasers (Invited Paper)
Authors:
Nobuyuki Abe, Osaka University; Ibaraki, Osaka Japan
Yoshinori Funada, Industrial Research Institute of Ishikawa; Kanazawa Japan
Presented at PICALO 2008
Diode lasers have a great advantage on energy conversion efficiency compared with other conventional lasers. On the other hand, they have a shortcoming on beam quality, because high power direct diode lasers have an elliptical shape beam with low power density, which is thought to be appried only heat treatment or laser cradding. This report describes that this characteristic of an elliptical beam shape enables good welding feature f...$28.00
PICALO 2008 Paper #M602 (Picosecond Lasers in Industrial Micromachining Applications (Invited Paper))
Picosecond Lasers in Industrial Micromachining Applications (Invited Paper)
Authors:
Rainer Kling, Laser Zentrum Hannover e.V.; Hannover Germany
Tobias Eschenberg, Laser Zentrum Hannover E. V. ; Hannover Germany
Frank Siegel, Laser Zentrum Hannover E. V. ; Hannover Germany
Ulrich Klug, Laser Zentrum Hannover E. V. ; Hannover Germany
Andreas Ostendorf, Laser Zentrum Hannover E. V. ; Hannover Germany
Presented at PICALO 2008
Picosecond lasers have the potential to combine the high process speed of nanosecond lasers with the excellent machining quality of femtosecond lasers. Recent enhancements of laser manufacturers address two major industrial...$28.00
PICALO 2008 Paper #M603 (Laser Direct-Write using Air-Drying Conductive Paste (Invited Paper))
Laser Direct-Write using Air-Drying Conductive Paste (Invited Paper)
Authors:
Daniel Perkins, Texas Christian University; Ft. Worth TX USA
David Willis, Southern Methodist University; Dallas TX USA
Jason Stegall, Southern Methodist University; Dallas TX USA
Presented at PICALO 2008
Laser direct-write was performed using commercially available silver paste to deposit patterns in an additive manner. The paste was a 60 % colloidal paste of 0.4 1.0 micron silver particles in a binder that dries under ambient conditions. Transfer was performed using a focused laser spot size of 110 micron and a spacer was placed between the paste and acceptor substrates to prevent con...$28.00
PICALO 2008 Paper #M604 (Direct Fabrication of Micro Temperature Sensor Arrays by Laser Micro-Cladding Functional Materials on Ceramic Substrates)
Direct Fabrication of Micro Temperature Sensor Arrays by Laser Micro-Cladding Functional Materials on Ceramic Substrates
Authors:
Cai Zhixiang, Wuhan National Laboratory for Optoelectronics; Wuhan Peoples Republic of China
Li Xiangyou, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology; Wuhan Peoples Republic of China
Zeng Xiaoyan, Wuhan National Laboratory for Optoelectronics; Wuhan Peoples Republic of China
Hu Qianwu, Huazhong University of Science and Technology ; Wuhan Peoples Republic of China
Presented at PICALO 2008
In this report, laser micro-cladding technology has been used to fabricate the micro temperat...$28.00
PICALO 2008 Paper #M701 (Multiscale Modeling of Ultrafast Laser-Material Interactions (Invited Paper))
Multiscale Modeling of Ultrafast Laser-Material Interactions (Invited Paper)
Authors:
Hai-Lung Tsai, University of Missouri-Rolla; Rolla MO USA
Lan Jiang, Beijing Institute of Technology; Beijing Peoples Republic of China
Presented at PICALO 2008
This paper reports the overall picture of our ongoing efforts to establish the scientific understanding of ultrafast, non-equilibrium laser-material interactions from nanometer to milimeter and from femtosecond to microsecond through comprehensive, integrated multiscale physico-chemical modeling and experimental verification. Based on the time when collisions govern the evolution of the phenomena, modeling of ultrafast laser-material inter...$28.00
PICALO 2008 Paper #M703 (Femtosecond Fabrication of Nonlinear Photonic Crystals)
Femtosecond Fabrication of Nonlinear Photonic Crystals
Authors:
Baohua Jia, Swinburne University of Technology; Melbourne Australia
Min Gu, Swinburne University of Technology; Hawthorn Australia
Presented at PICALO 2008
It has been demonstrated by many researchers that smooth void dots and void channels have been generated efficiently in polymers and glasses by use of a femtosecond laser induced microexplosion method. This method has been used to fabricate three-dimensional (3D) photonic crystals in those media. But the low refractive index media cannot open 3D complete bandgaps. Lithium niobate (LiNbO3 ) has a high refractive index of ~2.2 and a large transparent range of 0.45-5 ...$28.00
PICALO 2008 Paper #M706 (Ultrafast Laser Microprocessing and Microwelding (Invited Paper))
Ultrafast Laser Microprocessing and Microwelding (Invited Paper)
Authors:
Kazuyoshi Itoh, Osaka Uinversity; Suita, Osaka Japan
Takayuki Tamaki, Nara National College of Technology; Nara Japan
Presented at PICALO 2008
When ultrafast laser pulses are focused inside transparent materials such as glass, the optical intensity in the focal area can usually become high enough to initiate the nonlinear optical absorption and then the filamentary propagation of optical pulses. The nonlinear absorption leads to the avalanche ionization process and plasma is generated along the filamentary area. Due to this process, microstructure of the material is modified and usually the refractive index i...$28.00
PICALO 2008 Paper #M804 (Fabrication, Characterization and Simulation of Large-scale 3-D Photonic Crystals Using Laser-assisted Fabrication Techniques)
Fabrication, Characterization and Simulation of Large-scale 3-D Photonic Crystals Using Laser-assisted Fabrication Techniques
Authors:
H. Wang, University of Nebraska - Lincoln; Lincoln NE USA
Yongfeng Lu, University of Nebraska - Lincoln; Lincoln NE USA
Presented at PICALO 2008
3-D photonic bandgap (PBG) structures were fabricated by laser-assisted fabrication techniques, including laser-assisted nanoimprinting and laser-assisted chemical vapor deposition (LCVD), based on the self-assembled silica colloidal crystals. The multilayer silica colloidal crystals self-assembled on silicon substrates were formed with isothermal heating evaporation-induced self-assembly. To infiltrate th...$28.00
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