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
PICALO 2008 Paper #M805 (Design and Experimental Realization of 3D Photonic Components Via Two-Photon Polymerization)
Design and Experimental Realization of 3D Photonic Components Via Two-Photon Polymerization
Authors:
Andre Neumeister, Laser Zentrum Hannover; Hannover Germany
Andrei Lavrinenko, Technical University of Denmark; Lyngby Denmark
Johannes Zinn, Laser Zentrum Hannover; Hannover Germany
Mark Boyle, Laser Zentrum Hannover E.V.; Hannover Germany
Rainer Kling, Laser Zentrum Hannover E.V.; Hannover Germany
Reinhold J. Leyrer, Basf Aktiengesellschaft; Ludwigshafen Germany
Wendel Wohlleben, Basf Aktiengesellschaft; Ludwigshafen Germany
Roman Kiyan, Laser Zentrum Hannover E. V. ; Hannover Germany
Presented at PICALO 2008$28.00
PICALO 2008 Paper #M904 (Laser Device for Elemental Determination in Human Skin)
Laser Device for Elemental Determination in Human Skin
Authors:
Luis Ponce, CICATA-IPN; altamira, tamps Mexico
Teresa Flores, Cicta-Ipn; Altamira Mexico
Adian Pena, Cicta-Ipn; Altamira Mexico
Miguel Arronte, Cicta-Ipn; Altamira Mexico
Eduardo M. De Posada, Cicta-Ipn; Altamira Mexico
Presented at PICALO 2008
The development of laser device for in-situ elemental determination in human skin is presented. By using Er:YAG laser element, emitting 0.5 J energy pulses at 2,94 nm wavelength, its possible to generate an strong emitting plasma. By reading the plasma emission thorough a compact spectrometer, its possible to determine the presence of e...$28.00
PICALO 2008 Paper #P102 (Effects of Rare Earth Oxide on the Nucleation of Carbide Particles in Laser Cladded Mmcp Coating)
Effects of Rare Earth Oxide on the Nucleation of Carbide Particles in Laser Cladded Mmcp Coating
Authors:
Caofeng Wu, Tsinghua University, Dept of Mechanical Engineering; Beijing Peoples Republic of China
Mingxing Ma, Tsinghua University, Dept of Mechanical Engineering; Beijing Peoples Republic of China
Honjun Zhang, Tsinghua University; Beijing Peoples Republic of China
Minlin Zhong, Tsinghua University; Beijing Peoples Republic of China
Wenjin Liu, Tsinghua University, Dept of Mechanical Engineering; Beijing Peoples Republic of China
Weiming Zhang, Tsinghua University; Beijing Peoples Republic of China
Presented at PICALO 2008
P...$28.00
PICALO 2008 Paper #P104 (Study on the Pore Control of 5083 Aluminum Alloy by Dual-beam Laser Welding)
Study on the Pore Control of 5083 Aluminum Alloy by Dual-beam Laser Welding
Authors:
Kai Chen, Institute of Laser Engineering, Beijing University of Technology, ; Beijiing Peoples Republic of China
Rongshi Xiao, Beijing University of Technology; Beijing Peoples Republic of China
Rui Huang, Beijing University of Technology; Beijing Peoples Republic of China
Xudong Zhao, Beijing University of Technology; Beijing Peoples Republic of China
Song Zhang, Beijing University of Technology; Beijing Peoples Republic of China
Presented at PICALO 2008
Dual-beam CO2 laser welding process, the angle of the dual-beam laser is 22°, was used to research the po...$28.00
PICALO 2008 Paper #P106 (Study on the Surface Treatment for Controlling the Aluminum-Lithium Alloy Weld Porosity of Laser Welding)
Study on the Surface Treatment for Controlling the Aluminum-Lithium Alloy Weld Porosity of Laser Welding
Authors:
Chen Li, BAMTRI; Beijing Peoples Republic of China
Gong Shuili, BAMTRI; Beijing Peoples Republic of China
Li Xiaoyan, BJUT; Beijing Peoples Republic of China
Yang Jing, BAMTRI; Beijing Peoples Republic of China
Presented at PICALO 2008
The surface treatment methods were investigated to control the weld porosity of laser welding aluminum-lithium alloy, which were including in caustic washing, acid picking, mechanical polishing with stainless steel brush and laser cleaning in this paper. The effect of parameters of these surface treatment procedu...$28.00
PICALO 2008 Paper #P107 (Single Mode Fibre Laser Welding of Dissimilar Aerospace Alloys)
Single Mode Fibre Laser Welding of Dissimilar Aerospace Alloys
Authors:
Andrew Pinkerton, The University of Manchester; Manchester Great Britain
Hui-Chi Chen, The University of Manchester; Manchester Great Britain
Lin Li, The University of Manchester; Manchester Great Britain
Presented at PICALO 2008
Preventing the formation of brittle intermetallic compounds and defects or porosity in the fusion zone is a major challenge when welding dissimilar materials. Additionally, differences of physical properties between two joined materials generate thermal expansion mismatch stresses on cooling which means these weaknesses can quickly lead to failure. Welding research has not...$28.00
PICALO 2008 Paper #P108 (Laser Ablation of Al2O3 Ceramic in Naoh Medium)
Laser Ablation of Al2O3 Ceramic in Naoh Medium
Authors:
Shao Feng, Anhui Institute of Architecture & Industry; Hefei Peoples Republic of China
Yuan Gen-Fu, Anhui Institute of Architecture and Industry; Hefei Peoples Republic of China
Liang Hua-Qi, Anhui Institute of Architecture and Industry; Hefei Peoples Republic of China
Presented at PICALO 2008
In this paper, alumina ceramic samples were ablated with HGW-300 solid laser in sodium hydroxide solution. The influence of technical parameters, such as processing voltage, scanning speed, scanning width repeat frequency and sodium hydroxide concentration , on weight loss of the samples were studied. The morphology and str...$28.00