Selective Ablation of thin Nickel-chromium-alloy Films Using Ultrashort Pulsed Laser
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Linda Pabst, Robby Ebert, Horst Exner The selective ablation of 100nm thin Nickel-Chromium-alloy films on glass substrate was investigated using femtosecond laser pulses (λ=1030nm, τp=170 fs, Ep,max=7μJ). The influence of the processing parameters such as fluence, pulse number and pulse repetition rate on the ablation process was examined. Single and multiple pulses ablation thresholds of the Nickel-Chromium-alloy film were determined and the incubation coefficient calculated. Optical and electron microscopy were employed to characterize the patte...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Investigation on the Ablation of thin Metal Films with Femtosecond to Picosecond-pulsed Laser Radiation
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): M. Olbrich, E. Punzel, P. Lickschat, S. Weißmantel, A. Horn Ultrafast-pulsed laser radiation enables defined removing of different materials with very high processing accuracy due to the short interaction time of the radiation with the material, and the reduced heat affected zone compared to the removal with nanosecond laser radiation. For further processing improvements, a deep understanding of the involved processes of the laser radiation material interaction, especially the complex ablation phenomena, is necessary. Therefore, the ablation of me...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Dynamical Studies on Laser Processes Induced by Short Pulse Lasers: From Nanoseconds to Milliseconds
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Rie Tanabe, Thao Thi Phuong Nguyen, Yoshiro Ito Laser processes induced by short pulse lasers are widely applied in industries and research fields. Details of these processes depend on the laser wavelength and pulse duration of lasers used, materials irradiated, irradiation conditions such like power density and repetition rate and other parameters. To elucidate the details of these processes, we have developed a technique, which is named as high-speed laser stroboscopic videography, to take fast videos to visualize these processes. By combining a ne...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Laser Patterning of CIGS thin Films with 1550 nm Nanosecond Laser Pulses
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Martin Ehrhardt, Pierre Lorenz, Lukas Bayer, Igor Zagoranskiy, Klaus Zimmer The results of laser scribing experiments of CIGS thin films deposited on Mo-coated stainless steel sheets, using laser pulses with a wavelength of 1550 nm and a pulse duration of 6 ns, are presented in this study. It is shown that a removal of the CIGS from the Mo film is possible without edge melting of the CIGS or damaging of the Mo. The critical parameter for inducing the delamination lift-off process of the CIGS from the Mo was identified to be the scribing speed of th...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Nanostructuring of Fused Silica Assisted by Laser-shaped Metal Triangles Using a Nanosecond Laser
In this study we combined two self-organized processes: the microsphere lithography and the molten phase transformation for the nanostructuring of dielectrics. A fused silica substrate was covered with periodically ordered polystyrene (PS) spheres and the system was subsequently covered with 30 nm chromium. Afterwards the PS spheres were removed and the bare and resultant periodic Cr triangles were irradiated in two steps using a KrF excimer laser. First step: A low laser fluence treatment results in a melting and shape transformation of the triangles. Second step: A high laser fluence treatment of the pre-treated surface ...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Analysis of Melting and Melt Expulsion During Nanosecond Pulsed Laser Ablation
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Tobias Czotscher, Frank Vollertsen Manufacturing with nanosecond pulsed lasers is one the most efficient ablation processes and frequently used in the field of micro production. The aim of this study is to analyse the amount of melt expulsion during the laser ablation process of aluminium sheets with a thickness of 200 μm. The amount of recast layer, which deteriorates the surface finish is supposed to be reduced. The influence of the laser parameters on the high speed ablation process are investigated and described. The amount of melt expulsion is a...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Pulsed Laser Processing of Paper Materials
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Florian Schechtel, Yvonne Reg, Maik Zimmermann, Thomas Stocker, Fabian Knorr, Vincent Mann, Stephan Roth, Michael Schmidt At present the trends in paper and packaging industries are the personalization of products and the use of novel high-tech materials. Laser processes as non-contact and flexible techniques seem to be the obvious choice to address those developments. In this paper we present a basic understanding of the occurring mechanisms of laser based engraving of different paper and paperboard materials, using a picosecond laser source at...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Synthesis and Characterization of Pd Nanoparticles by Laser Ablation in Water Using Nanosecond Laser
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): M. Boutinguiza, M. Meixus, J. del Val, A. Riveiro, R. Comesaña, F. Lusquiños, J. Pou Colloidal solutions of Pd nanoparticles were produced by laser ablation of solids in liquids (LASL) technique. Two different lasers operating at 1064 and 532 nm of wavelength to ablate a Pd foil submerged in water were used. The properties of the obtained nanoparticles were studied and the influence of the wavelength on the nanoparticle size was discussed. The nanoparticles formation mechanism is discussed and compared with the results obtained in previous work...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Optimization and Simulation of SLM Process for High Density H13 Tool Steel Parts
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Petri Laakso, Tuomas Riipinen, Anssi Laukkanen, Tom Andersson, Antero Jokinen, Alejandro Revuelta, Kimmo Ruusuvuori This paper demonstrates the successful printing and optimization of processing parameters of high-strength H13 tool steel by Selective Laser Melting (SLM). D-Optimal Design of Experiments (DOE) approach is used for parameter optimization of laser power, scanning speed and hatch width. With 50 test samples (1×1×1cm) we establish parameter windows for these three parameters in relation to part density. The calculated numerical model...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Welding with High-power Lasers: Trends and Developments
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): M. Bachmann, A. Gumenyuk, M. Rethmeier High-power laser beam welding became new stimuli within the last 10 years due to the availability of a new generation of high brightness multi kilowatt solid state lasers. In the welding research new approaches have been developed to establish reliable and praxis oriented welding processes meeting the demands of modern industrial applications during this time. The paper focuses on some of the current scientific and technological aspects in this research field like hybrid laser arc welding, simulation techniques,...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Just-in-time Design and Additive Manufacture of Patient-specific Medical Implants
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Darpan Shidid, Martin Leary, Peter Choong, Milan Brandt Recent advances in medical imaging and manufacturing science have enabled the design and production of complex, patient-specific orthopaedic implants. Additive Manufacture (AM) generates three-dimensional structures layer by layer, and is not subject to the constraints associated with traditional manufacturing methods. AM provides significant opportunities for the design of novel geometries and complex lattice structures with enhanced functional performance. However, the design and manufacture ...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
R & amp;D Progress of HTS Magnet Project for Ultrahigh-field MRI
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): Taizo Tosaka, Hiroshi Miyazaki, Sadanori Iwai, Yasumi Otani, Masahiko Takahashi, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama An R&D project on high-temperature superconducting (HTS) magnets using rare-earth Ba2Cu3O7 (REBCO) wires was started in 2013. The project objective is to investigate the feasibility of adapting REBCO magnets to ultrahigh field (UHF) magnetic resonance imaging (MRI) systems. REBCO wires are promising components for UH...
Source: Physics Procedia - June 17, 2016 Category: Physics Source Type: research
Joint of REBa2Cu3O7- δ Coated Conductors Using Metal Organic Deposition
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): K. Hiramatsu, R. Teranishi, K. Yamada, Y. Sato, K. Kaneko Joint techniques connecting REBa2Cu3O7-δ(REBCO) coated conductors (CCs) are required to fabricate long length CCs and to repair locally damaged one. Two pieces of REBCO CC were attempted to be jointed using a metal organic deposition (MOD) method. The starting solution for YBCO layer was coated on GdBCO layer of CCs and calcined to fabricate precursor films, two of which were stuck together in a face to face manner, and then these films were pressurized and crystallized to joint them...
Source: Physics Procedia - June 17, 2016 Category: Physics Source Type: research
Construction and 1st Experiment of the 500-meter and 1000-meter DC Superconducting Power Cable in Ishikari
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): S. Yamaguchi, Y. Ivanov, H. Watanabe, N. Chikumoto, H. Koshiduka, K. Hayashi, T. Sawamura Ishikari project constructs two lines. The length of the Line 1 is 500 m, and connects the photovoltaic cell to the internet-data center. The other line is 1km length, and it is a test facility and called Line 2. The structures of the cable systems are not same to test their performance. The construction was started from 2014 in the field, the Line 1 was completed in May 2015, and it was cooled down and do the current experiment, and warmed up. The ...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Study on Thrust Improvement and Ripple Suppression of HTS Linear Switched Reluctance Motor with Coreless HTS Excitation Windings
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): Satoshi Oto, Tadashi Hirayama, Shuma Kawabata This paper describes a linear switched reluctance motor (LSRM) in which HTS tapes are used for coreless excitation windings in order to reduce the thrust ripple and normal force. This LSRM consists of a mover with saliency structure, coreless HTS coils and a stator back yoke. In this paper, we first describe the operating principle of the HTS-LSRM. Next, we calculate performances of the HTS-LSRM using 3-D FEM analysis. The effects of the motor structure on the thrust characteristic and normal force c...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
