Deposition of Ceramics by LPVD. (9999)
Funken, J., Kreutz, E. W., Kroesche, M., Sung, H., Voss, A.
The laser-assisted physical vapour deposition of ceramics is reported by photon-induced removal or vaporization of ceramic targets with subsequent deposition on stainless steel or hard metals....
Automated beam monitoring and diagnosis for CO2 lasers (2008)
L. Böske, S. Mann, E. W. Kreutz, F. Püschel, J. Richardt
The usage of a quality management, in combination with a standard certification, is nearly inevitable for today´s industrial manufacturing. In laser materials processing, a periodical beam diagnosis...
Walther, K., Brajdic, M., Kreutz, E.W.
Percussion drilling through holes in stainless steel (1.4301, 5, 8, and 10 mm in thickness) was performed with the superposed radiation of two pulsed Nd:YAG lasers. Holes were drilled with flash lamp...
Subwavelength ripple formation induced by tightly focused femtosecond laser radiation (2006)
Wagner, R., Gottmann, J., Horn, A., Kreutz, E.W.
Subwavelength ripples (< lambda/4) are obtained by scanning a tightly focused beam (about 1 µm) of femtosecond laser radiation (lambda = 800 nm, t(ind p) = 100 fs) over the surface of either bulk...
Laser technologies for manufacturing and repair of rotating machinery power plant components (2006)
Kreutz, E.W., Willach, J., Kelbassa, I., Keutgen, S., Poprawe, R.
Coloured marking inside glass by laser radiation (2005)
Ligbado, G., Horn, A., Kreutz, E.W., Krauss, M.M., Siedow, N., Hensel, H.
Laser labelling inside glass induces micro-cracks by high energy densities in the focus. The micro-cracks reduce the mechanical stability of glass. Light scattering allows the observer to perceive...
Schulz, W., Willach, J., Petereit, J., Trippe, L., Kreutz, E.W.
WO2005092560 A UPAB: 20051027 NOVELTY - The normal borehole radius (r B) is greater than the normal radius of the laser beam. The laser beam intensity (Intensitat) may be given a profile which falls...
Glaeser mit farbiger Innenmarkierung (2005)
Krauss, M., Raether, F., Hoffmann, D., Siedow, N., Kreutz, E.W., Talkenberg, M.
DE1004026257 A UPAB: 20051208 NOVELTY - Glass composition contains (in wt.%) 0.01-1 copper oxides (CuO/Cu2O), 0.01-1 iron (III) oxide (Fe2O3), 0.01-1 selenium/sodium selenate (Se/Na2SeO3), 0.01-1...
Approximate model for laser trepanning with microsecond Nd:YAG laser radiation (2005)
Willach, J., Michel, J., Horn, A., Schulz, W., Kreutz, E.W., Poprawe, R.
Horn, A., Kreutz, E.W., Poprawe, R.
Compared to laser radiation in the nanosecond regime, glass is modified using femtosecond laser radiation without cracking. The modification of the matrix structure of glass (BK7 glass, fused silica...
Cladding, drilling, and shaping of aerospace and power plant components by laser radiation (2004)
Kreutz, E.W., Willach, J., Kelbassa, I., Backes, G., Horn, A., Keutgen, S., ...
Drilling of cooling holes (diameter about 200µm) in a multilayer system (CMSX-4, MCrAlY, zirconia) of turbine blades enabling effusion cooling is performed via melt extraction by pulsed laser...
Farbige Lasermarkierung von Glas (2004)
Krauß, M., Kreutz, E.W., Talkenberg, M., Hoffmann, D., Siedow, N.
Trippe, L., Willach, J., Petereit, J., Kreutz, E.W., Schulz, W., Poprawe, R.
Single pulse drilling of micro holes (diameter 100 µm, depth < 2 mm) in stainless steel (X5CrNi18-10) and nickel-base superalloy (CMSX-4) is performed by pulsed Nd:YAG laser radiation (pulse...
Trippe, L., Willach, J., Kreutz, E.W., Schulz, W., Petereit, J., Kaierle, S., ...
Single pulse drilling and percussion drilling of micro holes (diameter 100 µm, depth 2 mm) with Nd:YAG laser radiation (pulse duration 100 - 500 µs) in stainless steel (X5CrNi18-10) and...
Approximate model for laser trepanning with microsecond Nd:YAG laser radiation (2004)
Willach, J., Michel, J., Horn, A., Schulz, W., Kreutz, E.W., Poprawe, R.
Trepanning of 200 µm cooling holes in 2 - 4 mm thick CMSX-4 turbine material is done by a lamp-pumped Nd:YAG slab laser with pulse durations of 100 - 500 µs and pulse energies up to 1 J determining...
Pulsed laser deposition of Er:BaTiO3 for planar waveguides (2004)
Schlaghecken, G., Gottmann, J., Kreutz, E.W., Poprawe, R.
Laser radiation is used for the deposition of dielectric erbium doped BaTiO3 thin films for photonic applications. Pulsed laser deposition with KrF excimer laser radiation (wavelength 248 nm, pulse...
PLD of perovskite coatings for optoelectronics, microelectronics, and microtechnology (2004)
The deposition of BaTiO3 thin films by pulsed excimer laser radiation (248 nm) on Pt/Ti/Si(111) and Pt/Ti/Si(100) substrates is investigated as a function of the processing variables laser fluence,...
Gottmann, J., Schlaghecken, G., Kreutz, E.W.
The dynamics of the laser induced plasma during pulsed laser deposition of BaTiO3 thin films is studied theoretically and experimentally and related to the resulting film properties. The expansion of...
Lugscheider, E., Bobzin, K., Erdle, A., Horn, A., Pütz, U., Kreutz, E.W., ...
Hier wird die Herstellung eines Mikroaktors auf Basis eines mittels Laser strukturiertem Bimetall-Elementes vorgestellt. Die Bimetallschichten werden als mehrlagiger Schichtverbund mit dem...
Electron excitation in glasses and sapphire followed by time- and space-measuring tools (2004)
Kreutz, E.W., Horn, A., Poprawe, R.
Temporal and spatial changes in the matrix of glasses (BK7 glass, fused silica, quartz) and sapphire are investigated during and after irradiation by pulsed laser radiation (100 fs < t(ind p) < 3 ps)...
Horn, A., Kreutz, E.W., Poprawe, R.
The dynamics of absorption after excitation of fused silica and BK7 glass with femtosecond laser radiation are visualized by transient absorption spectroscopy. Focusing laser radiation with pulse...
Feng, Y., Gottmann, J., Kreutz, E.W.
Structuring of poly ether ether ketone (PEEK) by 193 nm ArF excimer laser radiation has been investigated. Experiments were carried out in different atmospheres (air, vacuum, Ar, O2) in order to...
Gottmann, J., Schlaghecken, G., Wagner, R., Kreutz, E.W.
Laser radiation is used both for the deposition of dielectric Er:BaTi03 thin films and for material removal to generate wave guiding structures for photonic applications. Pulsed laser deposition with...
Microstructuring of SiC by laser ablation with pulse duration from ns to fs range (LAMP2002) (2003)
Kreutz, E.W., Weichenhain, R., Wagner, R., Horn, A.
The precision machining of silicon carbide (SiC) by short pulse (ns, ps) laser radiation has been investigated at different fluence and wavelength (355 nm, 532 nm, 1064 nm) to determine the...
New lasers and applications in innovative technologies (2003)
Kreutz, E.W., Poprawe, R., Loosen, P., Hoffmann, D.
Diode-pumped solid-state lasers are not only beginning to substitute the established laser sources like CO2 and lamp-pumped Nd:YAG lasers, which lead to new Laser applications because of their high...
Failure recognition and online processing control in laser beam welding (2003)
Böske, L., Kreutz, E.W., Petereit, J., Abels, P., Kaierle, S., Kratzsch, C.
By means of ISO 9000 and other by law enforced rules the manufacturing industry is forced to document and control the quality of their products. With the aim to improve the quality of the...
Willach, J., Kreutz, E.W., Michel, J., Nießen, M., Schulz, W., Poprawe, R.
Trepanning of 200µm holes in 2-5mm thick CMSX-4 sheets is done by laser radiation provided by a lamp-pumped Nd:YAG slab laser with pulse durations of 100-500µs. Pulse energies
Laser-assisted surface microstructuring of ME/ZrO2 bilayered thin-film system (2003)
Starbova, K., Krumov, E., Radoeva, M., Starbov, N., Popov, D., Schlaghecken, G., ...
Autonomous production cell for µm- and nm-processing (2003)
Kreutz, E.W., Böske, L., Kaierle, S., Mann, S., Ortmann, J., Willach, J.
Shorter life time cycles of products, increasing workpiece variety and declining lot sizes demand for a closed processing chain which enables the economic production of variable products in the...
Autonomous production cell for laser beam welding (2003)
Mann, S., Bollig, A., Kaierle, S., Enning, M., Kreutz, E.W., Abel, D., ...
Online detection of defect classes for laser beam welding (2003)
Ortmann, J., Kreutz, E.W., Maier, C., Wehner, T., Kogel-Hollacher, M., Kaierle, S., ...
Laserstrahlung - ein Werkzeug für die Herstellung von Mikroreaktoren (2002)
Kreutz, E.W., Jacquorie, M., Bremus-Köbberling, E., Wehner, M., Gillner, A., Poprawe, R.
Das Potenzial der Laserstrahlung als Werkzeug zur Herstellung von Mikroreaktoren wurde anhand von Demonstratoren und Mikrostrukturen aus verschiedenen Polymeren und Gläsern demonstriert. Mit...
Automated beam monitoring and diagnosis for CO/sub 2/ lasers (2002)
Mann, S., Böske, L., Kaierle, S., Kreutz, E.W., Poprawe, R.
The usage of a quality management, in combination with a standard certification, is nearly inevitable for todays industrial manufacturing. In laser materials processing, a periodical beam diagnosis...
Koaxiale Pulverduese zur Oberflaechenbearbeitung mit einem Diffusor (2002)
Backes, G., Kreutz, E.W., Keutgen, S.
DE 10120725 C UPAB: 20030101 NOVELTY - Powder nozzle comprises an inner part (1); an outer part (2); and an expansion chamber (4) for distributing a powder gas mixture flowing into an annular gap...
Willach, J., Horn, A., Kreutz, E.W.
Turbine blades are provided with cooling holes in order to protect them against the heat of the burning process. To avoid hot spots on the cooled blade surface aerodynamic blow-out facilities are...
Keutgen, S., Backes, G., Kreutz, E.W., Pirch, N.
Durch Legieren mit Nd:YAG Laserstrahlung wird unter der Bedingung der schnellen Erstarrung (DeltaT/Delta t>103K/s) die für tribologische Anwendungen typische Aluminiumlegierung AI4.5ZnMgPbSiCu der...
Front tracking thermomechanical model for transient stresses during laser welding (2002)
A thermo-elasto-plastic stress analysis of transient conduction-mode pulsed laser welding is performed with the Finite Element Method. The investigation focus on the degree of dependence of resulting...
Gottmann, J., Vosseler, B., Kreutz, E.W.
Using a high dielectric material as substitute for SiOxNy in dielectric film capacitors of dynamic memories (DRAM) allows a significantly higher integration density and a reduction of the die size,...
Modelling of chemical processes in the dynamic expansion for pulsed laser deposition (2002)
Kreutz, E.W., Aden, M., Niessen, M., Husmann, A., Poprawe, R.
The material transfer from the target to the substrate involved in pulsed laser deposition is described with respect to chemical reactions in the processing gas atmosphere in order to derive the...
Exposure of photosensitive glasses with pulsed UV-laser radiation (2002)
Brokmann, U., Jacquorie, M., Talkenberg, M., Harnisch, A., Kreutz, E.W., Hülsenberg, D., ...
The photosensitivity in UV-range of some glasses can be used for micro structuring. The irradiated areas crystallize after a thermal treatment. Microstructures are achieved by wet-chemical etching of...
UV laser radiation-induced modifications and microstructuring of glass (2002)
Talkenberg, M., Kreutz, E.W., Horn, A., Jacquorie, M., Poprawe, R.
Modifications and microstructures are generated on the surface and in the volume of silicate glasses using pulsed UV laser radiation of small pulse length. During the interaction of pulsed excimer...
Lambert, C., Weuster-Botz, D., Weichenhain, R., Kreutz, E.W., Graaf, A.A. De, Schoberth, S.M.
For the first time in intact bacterial cells, the dynamics of the build-up of soluble cytosolic inorganic polyphosphate (polyP) during aeration, and its breakdown during anaerobiosis have been...
Willach, J., Horn, A., Kreutz, E.W.
Drilling of cooling holes (diameter 200µm) by melt expulsion with microsecond pulsed laser radiation in a multilayer system (Ni-superalloy CMSX-4, VPS-McrAlY, EB-PVD-zirconia) of turbine blades is...
Kelbassa, I., Gasser, A., Backes, G., Keutgen, S., Kreutz, E.W., Pirch, N.
Closed-center process chain and an on-line temperature control for turbine component repair were validated. Laser cladding on turbine components by CO2 and Nd:YAG laser radiation is carried out using...
Perera, Y., Schlaghecken, G., Gottmann, J., Kreutz, E.W., Poprawe, R.
Pulsed laser deposition (PLD) has been carried out with KrF-excimer laser radiation (lambda(L) = 248 nm, tau(L) = 25 ns). The investigations are focused on the adherence of the diamond like carbon...
Open architecture control for laser materials processing (2002)
Ortmann, J., Kahmen, A., Kaierle, S., Kreutz, E.W., Poprawe, R.
In laser materials processing, usually CNC controls come into operation that are fitted to conventional applications of machining, like milling. Because of the flexibility required and the large...
Failure recognition and online process control in laser beam welding (2002)
Petereit, J., Abels, P., Kaierle, S., Kratzsch, C., Kreutz, E.W.
Dynamics of laser-induced cracking in glasses at a picosecond time scale (2001)
Horn, A., Weichenhain, R., Kreutz, E.W., Poprawe, R.
The interaction of picosecond pulsed laser radiation with BK7 glass has been investigated. Focusing laser pulses with 40 picosecond pulse duration in BK7 glass leads to plasma and crack formation by...
The use of lasers for the surface pretreatment of adhesive bonding parts (2001)
Dinger, K., Böhm, S., Poprawe, R., Kreutz, E.W., Horn-Solle, H., Barkhausen, W., ...
Materials, which are often used in the production engineering, are metals, plastics and composite materials. If these materials are used in an arrangement mix, the adhesive bonding technology is one...
Intelligent beam monitoring and diagnostics for CO2 lasers (2001)
Kaierle, S., Mann, S., Ortmann, J., Kreutz, E.W., Poprawe, R.
PLD of hard ceramic coatings (2001)
Perera, Y., Gottmann, J., Husmann, A., Klotzbücher, T., Kreutz, E.W., Poprawe, R.
The deposition of different hard ceramics coatings as Al2O3, ZrO2, c-BN and DLC thin films by pulsed laser deposition (PLD) has been of increasing interest as alternative process compared to the...
Perera, Y., Schlaghecken, G., Gottmann, J., Klotzbücher, T., Kreutz, E.W., Poprawe, R.
Pulsed laser deposition with KrF-excimer laser radiation (lambda = 248 nm; t = 25 ns) is used to grow diamond like carbon (DLC) thin films on PMMA and tool steel substrates. The investigations are...
Debris-reduced laser machining of polymeric waveguides for optoelectronic applications (2001)
Berden, T., Kreutz, E.W., Poprawe, R.
A polymer multilayer was spin coated on a substrate and was structured with pulsed KrF-excimer laser radiation to generate optical waveguides. Ablation rate, surface roughness and wall-angles were...
Manufacturing of precise SiC components by Nd:YAG laser radiation (2001)
Kreutz, E.W., Weichenhain, R., Horn, A., Poprawe, R.
Micromachining of SiC with Nd:YAG laser radiation was performed in various processing gas atmospheres as a function of processing variables showing the influence of the heat and pressure load onto...
Micromachining of glass with nanosecond Nd:YAG and femtosecond Ti:Sapphire laser pulses (2000)
Nicklaus, K., Kreutz, E.W., Kar, A.
Micro-machining of glass is important for fabricating many optical elements (filters, waveguides and microlenses), but the process is challenging due to the brittleness of glass. The use of short and...
Automated beam monitoring and diagnostics for laser materials processing (2000)
Mann, S., Fürst, B., Kaierle, S., Kreutz, E.W., Poprawe, R.
Deteriorations in the laser beam quality caused by pollution, wasting or defects of the optical components and the laser beam source can usually only be detected by time-consuming methods. Therefore,...
Metrology for laser-structured microdevices by CCD-camera based vision systems (2000)
Ostlender, A., Pütz, U., Kreutz, E.W.
Recent developements in the area of micromachining and mircofabrication are accelerating commericial awareness of microstructures. Product applications ranging from automotive and medical devices to...
Microholes in zirconia coated Ni-superalloys for transpiration cooling of turbine blades (2000)
Horn, A., Weichenhain, R., Albrecht, S., Kreutz, E.W., Niessen, M., Michel, J., ...
Drillings in zirconia coated Ni-superalloys is done by melt extraction with pulsed laser radiation provided by a Nd:YAG slab laser with microsecond pulse duration. This laser system distinguishes...
Jacquorie, M., Kreutz, E.W., Poprawe, R.
Microstructuring of soda lime -glass with excimer laser radiation is examined to present its process capabilities for production of surface structures particularly for microreaction technology....
Dahmen, M., Kaierle, S., Kreutz, E.W.
Die fünfteilige Artikelserie beschreibt Konzepte und Anwendungen der Lasertechnik in der Fertigung. Aufbauend auf einer Erhebung des Anwendungspotentials werden Aspekte der Anlagen- und...
Simulation of micro-channel heat sinks for optoelectronic microsystems (2000)
Kreutz, E.W., Pirch, N., Ebert, T., Wester, R., Ollier, B., Loosen, R., ...
Water-cooled heat sinks are investigated both experimentally and theoretically as model systems to simulate the energy and mass transport in devices used for cooling of optoelectronic microsystems....
The deposition of BaTiO3 thin films by pulsed excimer laser radiation (248 nm) on Pt/Ti/Si(111) and Pt/Ti/Si(100) substrates is investigated as a function of the processing variables laser fluence,...
Intra- und Extra-Cavity-Strahlformung durch optische Komponenten mit variabler Reflexion (2000)
Kreutz, E.W., Henning, T., Bernges, J., Unnebrink, L., Poprawe, R., Poignand, R., ...
Die Eigenschaften der Werkstoffe und der Laserstrahlung bestimmen mit den Verfahrensparametern das Bearbeitungsergebnis bei der Materialbearbeitung mit Laserstrahlung, welches bei vorgegebener...
Strukturieren mit Laserstrahlung (2000)
Kreutz, E.W., Berden, T., Weichenhain, R., Horn, A., Jacquorie, M.
Das Laserstrukturieren ermöglicht Strukturgenauigkeiten von wenigen mu m bei Strukturgrößen von wenigen mu m bis einigen mm. Als serielles Verfahren zeigt es eine hohe Flexibilität bezüglich der...
The development of solute distribution at dendritic interface for one step laser surface alloying /3/ is investigated by numerical simulation. The dendritic mushy zone is approximated by columnar...
Laserstrahlung - ein Werkzeug für die Herstellung von Mikroreaktoren (2000)
Kreutz, E.W., Jacquorie, M., Bremus-Köbberling, E., Wehner, M., Gillner, A., Poprawe, R.
Das Potential der Laserstrahlung als Werkzeug zur Herstellung von Mikroreaktoren wurde anhand von Demonstratoren und Mikrostrukturen aus verschiedenen Polymeren und Gläsern demonstriert. Mit...
Dahmen, M., Hinke, C., Kaierle, S., Kreutz, E.W.
Die vorliegende fünfteilige Artikelserie beschreibt Konzepte und Anwendungen der Lasertechnik in der Fertigung. Aufbauend auf einer Erhebung des Anwendungspotentials werden Aspekte der Anlagen- und...
Reliability and degradation mechanisms of InGa(Al)As/GaAs DQW high-power diode lasers (2000)
Kreutz, E.W., Wiedmann, N., Jandeleit, J., Hoffmann, D., Loosen, P., Poprawe, R.
Defects and degradation of InGa(Al)As/GaAs DQW diode laser bars mounted on copper micro-channel heat sinks were investigated. The analytical techniques used are optical microscopy and scanning...
Theoretical description of the dynamic phenomena in laser welding with deep penetration (1999)
Lopota, V., Turichin, G., Tzibulsky, I., Valdaytzeva, E., Kreutz, E.W., Schulz, W.
In this article the dynamic model of the process of the laser welding with deep penetration based on the variation principles is presented. The model takes into account melting flow, wave motion on...
Fürst, B., Dahmen, M., Kaierle, S., Kreutz, E.W., Poprawe, R.
Die vorliegende fünfteilige Artikelserie beschreibt Konzepte und Anwendungen der Lasertechnik in der Fertigung. Aufbauend auf einer Erhebung des Anwendungspotentials werden Aspekte der Anlagen- und...
Adaptive quality control for laser beam welding (1999)
Dahmen, M., Kaierle, S., Abels, P., Kratsch, C., Kreutz, E.W., Poprawe, R.
Design und manufacturing tools for laser beam processing (1999)
Kaierle, S., Fürst, B., Kittel, J., Kreutz, E.W., Poprawe, R.
Tasks in autonomous manufacturing for laser beam welding (1999)
Kreutz, E.W., Kaierle, S., Dahmen, M., Fürst, B., Kittel, J., Poprawe, R.
Structuring of ceramics and hard metals by short laser pulses (1999)
Weichenhain, R., Horn, A., Kreutz, E.W.
For materials, which are difficult to structure mechanically the application of diode pumped solid state lasers for producing three dimensional microstructures is of great interest. Three dimensional...
Three dimensional microstructures in ceramics by diode pumped solid state lasers (1999)
Weichenhain, R., Horn, A., Jandeleit, J., Kreutz, E.W.
The application of diode pumped solid state laser radiation for producing three dimensional microstructures is of great interest to materials, which are difficult to structure by conventional...
Gottmann, J., Schlaghecken, G., Kreutz, E.W.
The deposition of Al2O3 thin films by pulsed KrF excimer laser radiation (248nm) on fused silicia substrates is investigated as a function of the processing variables: laser fluence, processing gas...
Wesner, D.A., Aden, M., Gottmann, J., Husmann, A., Kreutz, E.W.
Holes in polypropylene (PP) and polymethylmethacrylate (PMMA) plates, 0.5 mm in thickness were drilled by irradiation with up to 3000 pulses of KrF-excimer laser radiation at fluences per pulse in...
Sintered targets of ZrO2 and Al2O3 are ablated by KrF excimer laser radiation. The processing gas atmosphere consists of O2 at pressures of 0.1-50 Pa. The films of 100 nm-10mu m in thickness are...
Functional and structural properties of thin electroceramic films by laser radiation (1999)
Kreutz, E.W., Gottmann, J., Mergens, M., Klotzbücher, T., Vosseler, B.
The deposition of single layer electroceramic thin films by pulsed excimer laser radiation (248 nm) on Ti/Pt/Si (111) substrates is investigated as a function af laser parameters (fluence, repetition...
Dynamics of ripple formation and melt flow in laser beam cutting (1999)
Schulz, W., Kostrykin, V., Niessen, M., Michel, J., Petring, D., Kreutz, E.W., ...
The dynamical behaviour of the laser beam fusion cutting process of metals is investigated. Integral methods such as the variational formulation are applied to the partial differential equations for...
X-RAY INDUCED CHANGES OF TRANSPORT PHENOMENA IN INDIUM ANTIMONIDE. (1998)
Author is with Physikalisches Institut der TH Darmstadt, W. Germany.
Dahmen, M., Kreutz, E.W., Mertes, J., Wolf, U.
Die vorliegende fünfteilige Artikelserie beschreibt Konzepte und Anwendungen der Lasertechnik in der Fertigung. Aufbauend auf einer Erhebung des Anwendungspotentials werden Aspekte der Anlagen- und...
Dieser Beitrag ist den Grundlagen der Materialbeabeitung mit Laserstrahlung gewidmet. Um die Werkzeugeigenschaften des Laserstrahls zu beschreiben, werden beispielhafte Anwendungen für die...
Model of laser-induced Material Removal of Polymers and Gasdynamics (1998)
Aden, M., Wesner, D.A., Kreutz, E.W., Poprawe, R.
A model is build up to describe the effects of the laser-induced material removal of polymers and the dynamics of the volatile species. The heating and removal are described by the volume- heating of...
Influence of the laser radiation on the plasma dynamics during arc-laser welding (1998)
Aden, M., Kreutz, E.W., Hausen, O., Poprawe, R.
The temperature distribution of the plasma plume occuring during TIG-arc- and Nd:YAGlaser- arc (hybrid) welding of steel (St 52) and aluminum alloy (AlMg3) is measured using emission spectroscopy....
Three dimensional microstructures in ceramics by diode pumped solid state lasers (1998)
Weichenhain, R., Horn, A., Jandeleit, J., Kreutz, E.W.
The application of diode pumped solid state laser radiation for producing three dimensional microstructures is of great interest to materials, which are difficult to structure by conventional...
Safety enclosures for laser cells (1998)
Dahmen, M., Alunovic, M., Kreutz, E.W., Schreiber, P.
During processing with laser radiation the operator as well as the environment in the vicinity of the laser machine has to be protected against primary and secondary radiation emitted by the process....
Klotzbücher, T., Mergens, M., Husmann, A., Gottmann, J., Kreutz, E.W.
Raman spectroscopy is employed for structural characterization of BaTiO3 ferroelectric thin films, deposited by a hybrid DC-field enhanced pulsed laser deposition (PLD)-process. Pulsed excimer laser...
Pulsed laser deposition of ceramics: Fundamentals and applications (1998)
The dynamics of energy coupling, material removal, material transfer and film growth are studied experimentally, theoretically and numerically for PLD of ceramics. Excimer-, Nd:YAG- and CO2 laser...
Pulsed laser deposition of ceramic thin films using different laser sources (1998)
Husmann, A., Gottmann, J., Klotzbücher, T., Kreutz, E.W.
Sintered targets of Al2O3 are removed by CO(2-) and excimer laser radiation and deposited as thin films onto steel and silicon substrates. Micro Raman spectroscopy and atomic force microscopy are...
Process and quality planning in laser beam welding (1998)
Kaierle, S., Dahmen, M., Fürst, B., Kittel, J., Kreutz, E.W., Poprawe, R.
Ecological and economical reasons demand advanced planning procedures in manufacturing. Process planning is utilized for the set-up of the laser machine and quality planning ensures the compatibility...
Optical properties of alumina and zirconia thin films grown by pulsed laser deposition (1998)
Gottmann, J., Husmann, A., Klotzbücher, T., Kreutz, E.W.
Sintered targets of ZrO2 and Al2O3 are ablated by KrF excimer laser radiation. The processing gas atmosphere consists of O2 at typical pressures of 10(exp -3)-1 mbar. Films with a thickness of...
Online control of penetration depth in laser beam welding (1998)
Kaierle, S., Beersiek, J., Kreutz, E.W., Poprawe, R., Günnewig, J., Rake, H.
In laser beam welding the penetration depth is one of the most important quality aspects. Many industrial applications demand for accurate welding depths without fluctuations. As a consequence the...
Neue Entwicklungen im Bereich der Dünnschichttechnologie (1998)
Kreutz, E.W., Gottmann, J., Klotzbücher, T.
Wie die Werkstoffe als Struktur- und Funktionswerkstoffe hergestellt werden können, lassen sich auch Schichten auf Substraten als Struktur- und Funktionsschichten abscheiden. Die Strukturschichten...
Gottmann, J., Klotzbücher, T., Kreutz, E.W.
Sintered targets of ZrO2, Al2O3 and BaTiO3 are ablated by KrF excimer laser radiation lambda=248 mn,tau=25 ns. The processing gas atmosphere consists Of O2 at typical pressures of 10(exp -3)-0.5...
Fundamental investigations of micromachining by nano- and picosecond laser radiation (1998)
Jandeleit, J., Horn, A., Weichenhain, R., Kreutz, E.W., Poprawe, R.
The removal processes of ceramics and metals were investigated using pico- and nanosecond laser radiation produced by diode-pumped Nd:YAG lasers. The laser radiation was focused to spot diameters...
Functional porous ceramic films by pulsed laser deposition (1998)
Kreutz, E.W., Gottmann, J., Sommer, M., Vosseler, B., Curdt, A.
Physical vapor deposition techniques are used in a variety of applications to deposit thin films with particular structural and functional properties for applications such as electronic, mechanical,...
Failure recognition in tailored blank welding by image processing (1998)
Abels, P., Kaierle, S., Kreutz, E.W., Poprawe, R.
Laser beam welding of tailored blanks is growing rapidly and the forecast for the following years predict a further development. The automotive industry as main customer for tailored blanks requires...
The dynamics in energy coupling, material removal, material transfer, and film growth are studied experimentally, theoretically and numerically for pulsed laser deposition of ceramics. Excimer laser...
Klotzbücher, T., Gottmann, J., Meyer, M., Wesner, D.A., Kreutz, E.W.
Pulsed laser deposition (PLD) with KrF-excimer laser radiation (lambda = 248 nm, tau = 25 ns) is used to grow thin films Of diamond-like carbon (DLC) on Si substrates by material removal from a...
Deposition of carbon nitride thin films in a hybrid r.f.-PLD technique (1998)
Klotzbücher, T., Scherge, M., Mergens, M., Wesner, D.A., Kreutz, E.W.
In a hybrid r.f.-PLD technique pulsed laser deposition (PLD) in combination with a capacitively coupled r.f. substrate bias with nitrogen as processing gas was used to synthesize CN(x) films with...
Crystal quality and orientation of pulsed laser deposited barium titanate thin films (1998)
Gottmann, J., Klotzbücher, T., Vosseler, B., Kreutz, E.W.
KrF excimer laser radiation (lambda=248 nm, tau=25 ns) is used for pulsed laser deposition of BaTiO3 thin films on Pt/Ti/Si multilayer substrates. The processing gas atmosphere consists of O2 at...
CAM feature model for laser beam welding (1998)
Kaierle, S., Dahmen, M., Kittel, J., Kreutz, E.W., Poprawe, R.
Today's situation with increasingly shorter time-to-market limits and growing variant spectra calls for advanced methods in the manufacturing domain. A big potential for gaining faster and better...
Saubere Luft beim Schweißen mit Laserstrahlung (1997)
Dahmen, M., Kreutz, E.W., Klein, R.M., Möhlmann, C.
Bei der Materialbearbeitung mit Laserstrahlung sind neben dem Gefährdungspotential durch Primär- und Sekundärstrahlung auch Risiken durch die während des Bearbeitungsprozesses erzeugten...
Pump and probe technique on excimer laser-induced plasmas (1997)
Aden, M., Alunovic, M., Kreutz, E.W.
The electron density and the geometry of an expanding vapor/plasma are investigated by pump and probe beam technique during the material removal of an Al203 target with pulsed excimer laser...
Pulsed laser deposition of crystalline PZT thin films (1997)
Husmann, A., Wesner, D.A., Schmidt, J., Klotzbücher, T., Mergens, M., Kreutz, E.W.
Sintered targets of PbZ(0.52)Ti(0.48)O3, are used in a pulsed laser deposition (PLD) process to deposit thin ferroelectric films onto a Pt/Ti/Si(111) substrate for electrical applications. Repetition...
Micromachining by picosecond laser radiation: Fundamentals and applications (1997)
Jandeleit, J., Rußbüldt, P., Kreutz, E.W., Treusch, H.G.
Decreasing film thicknesses and sizes of microstructures require an ultraprecise removal of the material and a reduction of the heat-affected zone. For these applications picosecond laser pulses seem...
Large area pulsed laser deposition of ceramic films (1997)
Kreutz, E.W., Backes, G., Mertin, M.
Large area pulsed laser deposition of alumina on stainless steel with Ar or Ar/O2 mixtures as processing gas in investigated using excimer laser radiation. The high area coveraging was achieved by a...
KrF-excimer laser pretreatment and metallization of polymers (1997)
Weichenhain, R., Wesner, D.A., Pfleging, W., Horn, H., Kreutz, E.W.
Metal film adhesion to polymers can be improved by pretreatment with UV-laser radiation before metal deposition. Chemical changes associated with irradiation are investigated for polyimide (PI) and...
Investigation of physical processes in PLD of ceramics by excimer laser radiation (1997)
Kreutz, E.W., Alunovic, M., Aden, M., Nießen, M.
A probe beam deflection technique is applied to investigate the vapour/plasma generated during material removal by laser radiation. The electron density and geometry of the expanding vapour/plasma...
Excimer-laser patterning of copper in LDE (laser dry etching) (1997)
Pfleging, W., Vörckel, A., Duddek, H., Wesner, D.A., Kreutz, E.W.
Patterning of Cu bulk material and Cu foils (1 mu m in thickness) with etch rates up to 20 A.U./pulse is performed in an LDE (laser dry etching) process with excimer laser radiation (lambda = 248 nm)...
Deposition of BaTiO3 thin films by a hybrid DC-field enhanced PLD-process (1997)
Husmann, A., Mertin, M., Klotzbücher, T., Kreutz, E.W.
BaTiO3, thin films are deposited onto (111)-Si/Ti/Pt using a hybrid DC-field enhanced pulsed laser deposition (PLD)-technique with excimer laser radiation. Space- and time-resolved plasma emission...
Aden, M., Kreutz, E.W., Schlüter, H., Wissenbach, K.
For the removal of material with pulsed laser radiation the distance travelled by the shock or blast wave and the amount of energy released in the plasma state due to the absorption of laser...
Advanced concepts for UV laser beam shaping with non-rotationally symmetric optical elements (1997)
Unnebrink, L., Henning, T., Scholl, M., Kreutz, E.W.
The potential of non-rotationally symmetric optical elements (NOEs) is demonstrated with respect to mask projection techniques with UV excimer laser radiation. NOEs are diamond turned mirrors with an...
Introduction of a CAM feature model for laser beam welding (1997)
Kittel, J., Dahmen, M., Fürst, B., Kaierle, S., Kreutz, E.W., Poprawe, R.
An approach to improve the quality of offline programming for laser beam welding is described. A CAD-dataset is combined with technological information using a feature model. A feature consists of...
CALAS - a process model for laser beam welding (1997)
Fürst, B., Dahmen, M., Kaierle, S., Kreutz, E.W., Poprawe, R., Turichin, G.
Virtual reality display for autonomous 3D-laser welding cells (1997)
Schlick, C., Dahmen, M., Kaierle, S., Luczak, H., Kreutz, E.W., Poprawe, R.
Failure analysis for laser beam welding (1997)
Kaierle, S., Dahmen, M., Diekmann, A., Kreutz, E.W., Poprawe, R.
Time-resolved spectroscopy of laser induced plasma from BaTiO3 (1996)
Mertin, M., Offenberg, D., Wesner, D.A., Kreutz, E.W.
The time-resolved luminescence spectra of laser induced plasma from BaTiO3 were studied with a optical rnultichannel analyzer (OMA III). The time of-flight spectra of' various particles, by which the...
Reconditioning of machine and engine parts using high-power LASER's (1996)
Gebhardt, A., Kreutz, E.W., Backes, G.
LASER cladding methods have not gained much interest by the industry although the processes are very well known. This paper discusses the reasons and the industrial requirements on laser cladding...
Prozeßüberwachung durch Temperaturregelung beim Generieren mit CO2-Laserstrahlung (1996)
Hoffmann, E., Backes, G., Gasser, A., Kreutz, E.W., Stromeyer, R., Wissenbach, K.
Generating with CO, laser radiation belongs to the latest Generation of rapid prototyping processes. From the point of view of process- ing principles, generating with laser radiation corresponds to...
Prozeßregelung sichert die Bearbeitungsqualität. Beschichten mit CO2-Laserstrahlung (1996)
Backes, G., Kreutz, E.W., Hoffmann, E., Wissenbach, K.
Um den steigenden Anforderungen an die Produktqualität nachzukommen, ist eine Prozeßüberwachung und -regelung von entscheidender Bedeutung. Dies gilt auch für das Beschichten mit...
Powerful features for LBW including theoretical aspects (1996)
Schulz, W., Fürst, B., Kaierle, S., Turichin, G., Kreutz, E.W., Poprawe, R.
The performance of laser beam welding strongly depends on the education of the machine operator. The development of processing parameters for each machine installation and trouble-shooting are time...
Picosecond laser ablation of thin copper films (1996)
Jandeleit, J., Urbasch, G., Hoffmann, H.D., Kreutz, E.W., Treusch, H.G.
The ablation process of thin copper films on fused silica by picosecond laser pulses is investigated. The ablation area is characterized using optical and scanning electron microscopy. The...
Optical and particle properties of PLD vapour/plasmas of ceramics (1996)
Alunovic, M., Stamm, H., Aden, M., Kreutz, E.W.
The electron density and the absorption coefficient of the laser induced vapour/plasma as well as the geornetry of the expanding plasma are investigated by the beam deflection. The electron density...
Mikrostrukturierung von Metallen und Halbleitern durch ultrakurze Laserpulse (1996)
Jandeleit, J., Urbasch, G., Hoffmann, D., Treusch, H.G., Kreutz, E.W.
Intensive, ultrakurze Laserpulse im ps-Bereich können zur präzisen Mikrostrukturierung unterschiedlichster Werkstoffe verwendet werden. Ein Vorteil der kurzen Pulsdauer liegt in der geringeren...
The laser-induced material removal and plasma formation during pulsed laser deposition (PLD) with CO2 and excimer laser radiation are simulated. The weight loss of the target is determined by the...
Laser beam welding with CALAS software-supported process planning and control (1996)
Dahmen, M., Fürst, B., Kaierle, S., Kreutz, E.W., Poprawe, R., Schulz, W., ...
Software supported process planning and quality assurance are of main importance for the realization of a manufacturing method in laser beam welding. A novel software tool for process planning and...
Laser-assisted surface modification and structuring for microsystem technology (1996)
The tailoring of chemical, morphological, optical and mechnical properties of surfaces by using, laser radiation is described for microsystem technology. taking advantage of matching the processing...
In der industriellen Fertigung wächst der Anspruch an hohe Fertigungsqualität. So sind auch im Bereich der Materialbearbeitung mit CO2-Laserstrahlung Maßnahmen erforderlich, um ein hohes...
Ergonomic user interface design for 3D-laser welding cells (1996)
Kaierle, S., Kreutz, E.W., Schlick, C., Luczak, H., Wenk, C., Weck, M.
An approach to ergonomic user interface design for 3D-laser welding cells is introduced which relies on both the human factor and software engineering methods. The operator's task of process control...
Energiedissipation bei der Wechselwirkung ultrakurzer Laserimpulse mit Festkörpern (1996)
Jandeleit, J., Urbasch, G., Hoffmann, H.D., Kreutz, E.W., Treusch, H.G.
Untersucht werden die Wechselwirkungsrnechanismen ultrakurzer Laserpulse mit Metallen, Halbleitern und Dielektrika im Bereich oberhalb der Schwellenergiedichte für den Materialabtrag. Verwendet wird...
Dry etching and micromachining of precision Silicon components (1996)
Kreutz, E.W., Pfleging, W., Jandeleit, J., Urbasch, G.
Dry etching and micromachining with laser radiation of short wavelength and pulse length are investigated to present their process capabilities for the production of surface structures within...
Cleaning of copper traces on circuit boards with excimer laser radiation (1996)
Wesner, D.A., Mertin, M., Lupp, F., Kreutz, E.W.
Cleaning of Cu traces on circuit boards is studied using pulsed excimer laser radiation (pulse width ca. 20 ns, wavelength 248 run), with the goal of improving the properties of the Cu surface for...
CCl4-assisted CF4 etching of silicon in a microwave-assisted LDE(laser dry etching)-process (1996)
Pfleging, W., Wesner, D.A., Kreutz, E.W.
A combination of microwave excitation and a mask projection scheme is applied for laser-assisted laterally structured etching of silicon. Different feed gases are used, such as CF4, either...
Alunovic, M., Backes, G., Kreutz, E.W., Scheller, D., Schreiber, P.
On the fitness of screening materials in the work areas Nd: YAG and diode lasers. Laser radiation can harm both the user and the environment in the event of malfunction if it is not screened by...
Model-based process planning and control - laser beam welding with CALAS (1996)
Dahmen, M., Fürst, B., Kaierle, S., Kreutz, E.W., Poprawe, R., Turichin, G.
Software supported process planning and quality assurance are of primary importance for the realization of a manufacturing method in laser beam welding. A novel software tool for process planning and...
Autonomous manufacturing planning and control in laser beam welding (1996)
Kaierle, S., Dahmen, M., Fürst, B., Kittel, J., Kreutz, E.W., Poprawe, R.
Weight loss of alumina and zirconia targets during PLD (1995)
Aden, M., Kreutz, E.W., Voss, A.
The weight loss due to laser-induced vaporization of aluminia and zirconia is investigated both theoretically and experimentally. To calculate the weight loss of the target under laser irradiation a...
A tool for efficient laser processing (1995)
Beyer, E., Dahmen, M., Fuerst, B., Kreutz, E.W., Nitsch, H., Schulz, W.
Tailoring of surface properties by removal and deposition with laser radiation (1995)
Kreutz, E.W., Frerichs, H., Mertin, M., Wesner, D.A., Pfleging, W.
The tailoring of chemical, morphological, and mechanical surface properties with laser radiation is described on the basis of the understanding and control of photon-matter interaction. The removal...
Surface analysis of films and film systems produced by pulsed laser deposition (1995)
Wesner, D.A., Pfleging, W., Klotzbücher, T., Kreutz, E.W.
Ceramic films and film systems (ZrO2 films, ZrO2/Ti multilayers, and BN films) are deposited by pulsed laser deposition (PLD) and analyzed using X-ray photoelectron (XPS), Auger electron (AES), and...
Structure and chemical composition of BN thin films grown by pulsed-laser deposition -PLD- (1995)
Klotzbücher, T., Pfleging, W., Mertin, M., Wesner, D.A., Kreutz, E.W.
BN thin films are grown on Si(100) substrates in a pulsed-laser-deposition (PLD) process using a pulsed CO2 laser, a hexagonal-phase BN (h-BN) target, and N2 as processing gas. The effect of RF power...
Rapid prototyping with CO2 laser radiation (1995)
Kreutz, E.W., Backes, G., Wissenbach, K., Gasser, A.
The one-step powder cladding of stainless steel by stellite with CO2 laser radiation is investigated as a function of laser parameters (power density, beam geometry, mode of operation) and processing...
Prozeßregelung beim Beschichten mit CO2-Laserstrahlung kann die Bearbeitungsqualität sichern (1995)
Backes, G., Kreutz, E.W., Wissenbach, K.
Zur Sicherung der Bearbeitungsqualität beim Beschichten mit Laserstrahlung ist die Prozeßkontrolle und -regelung von entscheidender Bedeutung. Am Beispiel des Beschichtens von Kolbenstangen wird...
Processing of polymer surfaces by laser radiation (1995)
Kreutz, E.W., Frerichs, H., Stricker, J., Wesner, D.A.
The processing of polymer surfaces by laser radiation is investigated as a function of laser parameters (fluence, mode of operation) and processing variables (repetition rate, pulse number). Polymers...
Patterning of Si(100) in microwave assisted LDE (Laser dry etching) (1995)
Pfleging, W., Wehner, M., Lupp, F., Kreutz, E.W.
With the MALDE process high etch rates up to 1 mu m/min are obtained for p-Si(100) and P-Si(111) at room temperature by using excited CF4 and non-excited CC14 as processing gases. XPS measurements...
Kogel-Hollacher, M., Stamm, H., Niessen, M., Alunovic, M., Treusch, H.G., Aden, M., ...
The electron density, the plasma front velocity and the geometry of an expanding vapour/plasma are investigated during the material removal of Al2O3 with pulsed CO2 laser radiation. The results...
Ein numerisches Modell zum einstufigen Laserstrahlbeschichten (1995)
Ollier, B., Pirch, N., Kreutz, E.W.
Laser cladding is a method to deposit coatings on surfaces, that enable an improvement of the chemical and tribological resistance by hardfacing. Theoretical and experimental results for the...
Weck, M., Henning, T., Kreutz, E.W., Lebert, R., Özmeral, H.
Bei vielen Anwendungen in der Materialbearbeitung mit Laserstrahlung muß die Leistungsdichteverteilung des Laserstrahls den Anforderungen des Wechselwirkungprozesses zwischen Strahlung und Materie...
Dahmen, M., Möhlmann, C., Klein, R., Kreutz, E.W., Häger, A.O.
To get detailed information of the global fume distribution experimental examinations of the indoor air flow in the working area of machines for laser materials processing is investigated for two...
Gillner, A., Wehner, M., Kreutz, E.W., Frerichs, H., Mertin, M., Offenberg, D.
Durch Laserverfahren können Funktionsschichten bei niedrigen Temperaturen auf beinahe beliebige Substrate abgeschieden werden. Die Vorteile der Laserverfahren sind : stöchiometrische...
Lasergestützte Aufbau- und Verbindungsverfahren in der Mikrosystemtechnik (1995)
Die Mikrosystemtechnik vereint elektronische, optische, mechanische und vielfach auch fluidische Komponenten zu einem Gesamtsystem, das als Sensor, Aktor und Übertragungsglied fungieren kann. Im...
Laser surface alloying of metallic materials (1995)
He, X., Pirch, N., Kreutz, E.W., Mordike, B.L.
In this paper the development of a two dimensional model is described for one step laser surface alloying. The temperature, flow and concentration fields in the longitudinal section are calculated...
Laser radiation. A tool for generation of defined thin film properties for application (1995)
Kreutz, E.W., Alunovic, M., Klotzbücher, T., Mertin, M., Wesner, D.A., Pfleging, W.
Pulsed laser deposition as a method of physical vapour deposition suitable for the deposition of thin films with complex structures and compositions is briefly reviewed. Excimer, Nd:YAG and CO2 laser...
Laser-Material-Interaktion: Grundlagen der thermischen Materialbearbeitung (1995)
Laserstrahlung wird in der Materialbearbeitung als berührungsloses, flexibles und abnutzungsfreies Bearbeitungs- und Messwerkzeug verwendet, das sich ausgezeichnet mit Numerischen Prozeßsteuerungen...
Laser-induced surface modification and metallization of polymers (1995)
Frerichs, H., Stricker, J., Wesner, D.A., Kreutz, E.W.
Laser-induced surface modification of different polymers is presented as a suitable pretreatment of surfaces in a two-step metallization process. Materials such as polyamide (PA), polypropylene (PP),...
Electron and laser radiation as sources of zirconia film deposition (1995)
Kreutz, E.W., Lemmer, O., Wesner, D.A., Alunovic, M., Erkens, G., Leyendecker, F., ...
The deposition of zirconia films by electron and laser radiation on steel substrates was investigated as a function of beam parameters and processing variables. The type, the number and the angular...
Diodengepumpter regenerativer Verstärker (1995)
Hoffmann, D., Treusch, H.G., Kreutz, E.W.
Für Untersuchungen zur Mikrobearbeitung mit Laserpulsen mit Pulsdauern kleiner 100 ps wird Laserstrahlung mit hoher Strahlqualität ( TEM00-Mode, M(hoch2) < 1.1 ), geringer zeitlicher Fluktuation...
Degradation of optical components in laser machines for manufacturing (1995)
Kreutz, E.W., Dahmen, M., Haas, C.R., Wesner, D.A.
Coated ZnSe optical components are irradiated with high-power pulsed CO2 laser radiation (lambda=10.6 micrometer, pulse length about 100 ns) at fluences up to 250 J/sqcm. The components are...
Degradation of guarding materials for a CO2 laser cell (1995)
Alunovic, M., Kramer, T., Kreutz, E.W., Schreiber, P.
The results of downgraded laser guards are shown in diagrams of removal depth as a function of processing time and laser intensity. Capability lists show the phenomenal of each guard material in C02...
Beschichten von Kurbelzapfen mit CO2-Laserstrahlung (1995)
Backes, G., Gasser, A., Kreutz, E.W., Wissenbach, K.
In der Energietechnik werden eine Vielzahl von Motoren und Verdichtern verwendet, die aufgrund des üblichen Verschleißes instand zu halten sind. Kurbelwellen zum Beispiel, deren Kurbelzapfen durch...
Arbeitsplatzkonzentration bei der Materialbearbeitung mit Laserstrahlung (1995)
Dahmen, M., Häger, A.O., Klein, R.M., Kreutz, E.W., Möhlmann, C.
Die Konzentrationen der Schadstoffe im Arbeitsraum liegen bei den untersuchten Verfahren unter den in Deutschland gültigen Grenzwerten (MAK, TRK). Die Höhe der Konzentrationen wird durch die Wahl...
Arbeitsplatzgestaltung in der Systemplanung (1995)
Dahmen, M., Klein, R.M., Kreutz, E.W., Möhlmann, C.
Die Einführung innovativer Fertigungsverfahren in die betriebliche Produktion birgt für den Anwender Risiken, die in den mangelnden Kenntnissen im Umgang mit der neuen Technologie (Lasertechnik)...
Process diagnosis and control for removal processes with excimer laser radiation (1994)
Barkhausen, W., Wehner, M., Wissenbach, K., Kreutz, E.W.
Many basic aspects of surface treatment with Excimer laser radiation have been investigated and it has been shown that the processing results are affected by variations of the processing variables as...
PLD of thin films for applications (1994)
Voss, A., Pfleging, W., Alunovic, M., Kreutz, E.W.
Thin films are widely used in a variety of applications either as structural overcoats or as functional coatings. Pulsed laser deposition (PLD) shows various advantageous properties for the...
Investigation of optical components under irradiation with high-power, cw CO2 lasers (1994)
Angenent, A., Haas, C.R., Koch, J., Kreutz, E.W., Wesner, D.A.
Optical components used in high-power, cw-lasers must withstand power densities of up to several tens of kW/cm (exp 2) over long periods of time without appreciable changes in their properties...
Pulsed laser deposition and patterning of electroceramic thin films (1994)
Mertin, M., Offenberg, D., An, C.W., Wesner, D.A., Kreutz, E.W.
Kreutz, E.W., Alunovic, M., Voss, A., Pfleging, W., Sung, H., Wesner, D.A.
Single-component films of cerammic materials (Al2O3, ZrO2, BN) as well as multi-component films and controllably inhomogeneous films (ZrO2, Ti) were investigated. The deposition was performed using...
Investigation of plasma expansion in the PLD process by means of an electrical probe (1994)
Brcka, J., Alunovic, M., Voss, A., Kreutz, E.W.
The technique of electrical probe measurements has been used as a tool for the investigation of the dynamic properties of ions in the plasma plume during the removal of material from from an Al203...
Investigation of material removal in pulsed-laser deposition of ceramics (1994)
Kreutz, E.W., Aden, M., Alunovic, M., Voss, A.
The material removal of the ceramics alumina and zirconia by CO2 and excimer laser radiation is investigated both experimentally and theoretically. The experimental investigations include...
Description of transfer and deposition during PLD of thin ceramic films (1994)
Alunovic, M., Kreutz, E.W., Voss, A., Aden, M., Sung, H.
Thin films of ceramic materials (Al2O3ZrO2) for technical applications are deposited at different laser parameters (wavelength, fluence, mode of operation) and processing variables (processing gas...
Damage to coated ZnSe optical components by high-power CO2 laser radiation (1994)
Haas, C.R., Kreutz, E.W., Wesner, D.A.
Coated ZnSe optical components are irradiated with high-power, pulsed CO2 laser radiation (Lambda = 10.6 mym, pulse length about 100 ns) at fluences up to 210 J/qcm. The components are characterized...
Time-resolved diagnosis of processes in PLD of ceramics (1993)
Voss, A., Kreutz, E.W., Funken, J., Alunovic, M., Sung, H.
The material transfer of ceramics (Alsub2Osub3, ZrOsub3) in pulsed laser deposition (PLD) is studied as a function of pulsed CO2 laser radiation parameters and processing variables. Timeresolved...
Review of safety issues for laser systems in manufacturing (1993)
The protection program of engineering safety-related issues is reviewed in the evaluation field of industrial laser systems in manufacturing, which centers about system design and operational...
Laser-induced plasma formation during pulsed laser deposition (1993)
Aden, M., Kreutz, E.W., Voss, A.
The ablation of Al203 by C02 laser radiation is investigated both theoretically and experimentally. The model connects the laser-induced phase transition from condensed to vaporized state of the...
Laser induced plasma - a source of control of the properties of thin films (1993)
Kreutz, E.W., Voss, A., Alunovic, M., Funken, J., Sung, H.
The temporal and spatial properties of laser-induced vapour and/or plasma involved in thin film deposition were investigated as a function of laser parameters (wavelength, power density distribution)...
Hoogvermogenlasers voor thermisch behandelen van oppervlakken. Tl.2 (1993)
Barkhausen, W., Gasser, A., Küpper, F., Vitr, G., Wehner, M., Wissenbach, K., ...
Hoogvermogenlasers voor thermisch behandelen van oppervlakken. Tl.1 (1993)
Barkhausen, W., Gasser, A., Küpper, F., Vitr, G., Wehner, M., Wissenbach, K., ...
Hochfrequenz-Funkenzündung explosionsfähiger Atmosphären (1993)
Untersucht wird die Zündung eines Gasgemischs durch Funken bei Frequenzen bis etwa 1 GHz. Die erforderlichen Leistungen und Energien für Öffnungs- und Schließfunken sowie Funken zwischen...
Damage to cooper mirrors by high-power CO2 laser radiation (1993)
Angenent, A., Haas, C.R., Koch, J., Kreutz, E.W., Wesner, D.A.
A focussed, cw CO2 laser is used to irradiate polished Cu mirrors at power densities near 40 kW/qcm. Uncoated mirrors and mirrors having a reflection-enhancing Au coating with a protective Y2O3 layer...
Aden, M., Alunovic, M., Voss, A., Sung, H., Kreutz, E.W., Brcka, J.
Thin films of ceramic materials (Al2O3, ZrO2, SiC) for technical applications are deposited at different laser parameters (wavelength, fluence, mode of operation) and processing variables (processing...
Vorbehandlung von Klebeflächen an Faserverbundwerkstoffen mit Laserstrahlung (1992)
Kreutz, E.W., Wehner, M., Wissenbach, K.
Die Grundlagen der Materialbearbeitung mit Laserstrahlung werden dargestellt und auf das Abtragen von Oberflächenschichten übertragen. Vor- und Nachteile der Vorbehandlung von Klebeflächen an...
Surface remelting and alloying of Al-based alloys with CO2 laser radiation (1992)
Kreutz, E.W., Rozsnoki, M., Pirch, N.
Surface remelting and alloying with CO2 laser radiation of aluminium (Al99.99) and Al-based alloys (AlSi10Mg) are investigated as a function of processing variables. Cr and Ni have been used as...
Removal and transfer of material in laser-assisted physical vapour deposition of ceramics (1992)
Voss, A., Funken, J., Alunovic, M., Sung, H., Kreutz, E.W.
The removal and transfer of ceramic target materials in laserassisted physical vapour deposition are investigated as a function of laser parameters and processing variables. Removal was measured by a...
Reactive TiN deposition on alloys with laser radiation (1992)
Kreutz, E.W., Krösche, M., Sung, H., Voss, A., Wissenbach, K.
The formation of TiN layers on metallic substrates is investigated as a function of processing variables. Thin TiN films are generated by laserassisted physical vapor deposition by evaporation of Ti...
Reactive TiN deposition on alloys using laser radiation (1992)
Kreutz, E.W., Krösche, M., Sung, H., Voss, A., Jürgens, A., Leyendecker, T.
The heterogeneous formation of TiN layers on titanium-based alloys has been demonstrated by surface alloying in nitrogen using laser radiation taking advantage ot the melt dynamics. The homogeneous...
Potential of photon and particle beams for surface treatment of thin ceramic coatings (1992)
Celis, J.P., Franck, M., Roos, J.R., Kreutz, E.W., Gasser, A., Wehner, M., ...
Laser irradiation and ion implantation have been investigated in order to modify in a two-step process the characteristics of TiN ceramic coatings obtained by physical vapour deposition (PVD) on...
Sung, H., Erkens, G., Funken, J., Voss, A., Lemmer, O., Kreutz, E.W.
Alsub2Osub3, ZrOsub2 and SiC filsm were generated by pulsed CO2 and Nd: YAG laser radiation respectively. The films were investigated by scanning electron microscopy, X-ray diffraction and...
Mit oder ohne Zusätze. Lasertechnik - Funktionsflächen veredeln (1992)
Der Laserstrahl stößt in das Feld der Oberflächenbehandlung vor. In einzigartiger Weise lassen sich einsatzgerechte Funktionsoberflächen mit dem Laser erzeugen: Härten, Umschmelzen, Legieren und...
Melt dynamics and solidification in surface processing with laser radiation (1992)
Kreutz, E.W., Ollier, B., Pirch, N.
2- and 3-dimensional self consistent modelling calculations of the surface-tension driven melt dynamics with flat and free surfaces are presented as a function of processing variables for surface...
LPVD - fundamentals of material removal and transfer (1992)
Alunovic, M., Funken, J., Kreutz, E.W., Sung, H., Voss, A.
The removal and the transfer of target materials, as the most important, physical processes in LPVD highly dominating the thin film formation on substrates, are investigated as a function of laser...
Laser surface alloying of Al99.99 and AlSi10Mg with Cr and Ni (1992)
Kreutz, E.W., Pirch, N., Rozsnoki, M.
The surfaces of Al99.99 and AlSi10Mg are alloyed with laser radiation using Cr and Ni which are blown into the melt pool within the interaction zone by powder feeding technique. The alloyed zone was...
Laser-assisted physical vapour deposition of ceramics (1992)
Funken, J., Kreutz, E.W., Krösche, M., Sung, H., Voss, A., Erkens, G., ...
The laser-assisted physical vapour deposition of ceramics by photoninduced removal or vapourization of ceramic targets with subsequent deposition on stainless stell or hard metals. Different modes of...
Klebeflächenvorbehandlung von Faserverbundkunststoffen mit Laserstrahlung (1992)
Wehner, M., Barkhausen, W., Wissenbach, K., Kreutz, E.W., Schäfer, H., Wohwinkel, F.
Die Oberflächenmodifikation mit Laserstrahlung erlaubt eine definierte Vorbehandlung von Klebeflächen an Faserverbundwerkstoffen. Durch Abtragen dünner Schichten werden Verunreinigungen entfernt,...
Keramikschichten auf metallischen Substraten (1992)
Sung, H., Pfleging, W., Voss, A., Kreutz, E.W., Erkens, G.
Bei dem PlD (Pulsed Laser Deposition)-Verfahren wird Targetmaterial durch Laserstrahlung abgetragen und auf einem Substrat deponiert. Die Vielseitigkeit des Verfahrens eröffnet ein breites...
Ionic properties in plasma generated by XeCl laser ablation process (1992)
Brcka, J., Kreutz, E.W., Voss, A.
The paper deals with ionic properties in plasma generated by an excimer laser XeC1 during ablation process of an A 1203 target. By means of an electrical probe the ion density in the plasma plume was...
Der idealen Oberfläche auf der Spur. Laser in der Oberflächentechnik (1992)
Herziger, G., Kreutz, E.W., Wissenbach, K.
Laserstrahlung findet in wachsendem Maße Eingang, in die Produktionstechnik. Schneiden und Schweißen in zwei Dimensionen können als Standardverfahren angesehen werden. Der größte...
Entzundern von Schweißnähten an Edelstahlblechen mit Laserstrahlung (1992)
Wehner, M., Barkhausen, W., Wissenbach, K., Kreutz, E.W., Grötsch, G.
Das Abtragen mit gepulster Laserstrahlung kann als einstufiger Reinigungsprozeß zum Entzundern von Edelstahloberflächen dienen. Potentiostatische Untersuchungen an Blechen zeigen eine deutliche...
Khanna, A.S., Singh Raman, R.K., Kreutz, E.W., Terrance, A.L.E.
Stainless-steel powder was coated on mild steel substrated using a plasma coating technique. The porous coating thus obtained was modified using laser treatment. The oxidation behaviour of the...
Deposition of ceramics by LPVD (1992)
Funken, J., Kreutz, E.W., Krösche, M., Sung, H., Voss, A., Erkens, G., ...
The laser-assisted physical vapour deposition of ceramics is reported by photon-induced removal or vaporization of ceramic targets with subsequent deposition on stainless steel or hard metals....
Characterization and applications of PLD oxide ceramic films (1992)
Alunovic, M., Funken, J., Kreutz, E.W., Sung, H., Voss, A., Erkens, G., ...
The pulse laser deposition (PLD) exhibits various consecutive processes (1,2) separated in space and time such as the energy coupling into the target material, the removal of the material from the...
Umschmelzen von Aluminium-Gußlegierungen mit CO2-Laserstrahlung. (1991)
Backes, G., Kreutz, E.W., Ollier, B., Pirch, N., Rozsnoki, M., Gasser, A., ...
Im Vergleich mit konventionellen Methoden erlaubt Laserstrahlung durch definierte Wärmeeinbringung eine Oberflächenveredelung zu erreichen, ohne das restliche Bauteil zu beeinflussen. Weitere...
Prozeßdiagnose beim Beschichten mit CO2-Laserstrahlung (1991)
Backes, G., Gasser, A., Kreutz, E.W., Trojan, K., Wissenbach, K.
During laser cladding of steels with stellite the emitted heat radiation form the interaction zone between laser radiation and substrate is monitored. Correlations between the detected signals and...
Oberflächenbearbeitung mit Hilfe der Lasertechnik. (1991)
Wissenbach, K., Backes, G., Gasser, A., Kreutz, E.W., Küpper, F., Wehner, M., ...
The advantages of Laser Surface Treatment, precicely controlable energy input, low thermal load to the components, fine grained structures, suitability for on-line process control and flexibility are...
Melt dynamics in surface processing with laser radiation (1991)
Pirch, N., Kreutz, E.W., Möller, L., Gasser, A., Wissenbach, K.
The basic physical processes of melting with laser radiation are reported especially including the free self-adjusting surface. A three dimensional stationary model for the thermocapillary flow is...
Die Humping Instabilität beim Schweißen mit Laserstrahlung (1991)
Pirch, N., Schmidt, H., Ollier, B., Kreutz, E.W., Becker, D.
Theoretische Untersuchungen zur Umströmung der Dampfkapillaren beim Schweißen mit Laserstrahlung werden vorgestellt. Der lokale Wärmestrom auf der schmelz-/gasförmigen Grenzfläche wird in einem...
Lugscheider, E., Hofmann, D., Jansen, F., Nicoll, A.R., Kreutz, E.W., Wissenbach, K., ...
Titanium and niobium coating, produced by vaccum plasma spraying firstly were optimized respectively to porosity by multi factor analysis and secondly were densified and remelted by subsequent...
Dispersion of hard particles in light alloys with Co2 laser radiation (1991)
Gasser, A., Kreutz, E.W., Krönert, K., Lohmann, K., Wissenbach, K., Zografou, C.
Different hard particles (SiC, TiC) are dispersed in light metals and alloys (Al99.99; AlSilOMg; TiAl6V4) by Co2 laser radiation. The hard particles are injected into the melting pool in rofm of a...
Cladding of valves with Co2 laser radiation (1991)
Küpper, F., Kreutz, E.W., Gasser, A., Wissenbach, K.
For the cladding of valves the correlation between the processing parameters laser power, feed rate, beam geometry, powder feeding rate, type of powder and processing results such as layer geometry,...
Ablation of oxide layers on metallic surfaces by excimer laser radiation (1991)
Wehner, M., Grötsch, G., Kreutz, E.W., Schulze, W., Wissenbach, K.
The application of excimer laser radiation for scale removal on sheet material and welding seams is investigated on corrosion resistant austenitic steels for short pulse KrF and long pulse XeCl laser...
Surface treatment of car engine components with laser radiation (1990)
Wissenbach, K., Gasser, A., Kreutz, E.W., Küpper, F., Zwick, A., Beyer, E.
To improve the wear and/or corrosion properties of car engine components, different techniques of surface treatment like transformation hardening, surface temelting and cladding with CO2 laser...
Surface remelting of cast iron camshafts by CO2 laser radiation (1990)
Zwick, A., Gasser, A., Kreutz, E.W., Wissenbach, K.
Cast iron cams of assembled camshafts are remolten by CO2 laser radiation to enhance the wear properties by producing a ledeburitic layer. The investigations are performed on four different globular...
Surface melting of AlSi10Mg with Co2 laser radiation (1990)
Backes, G., Gasser, A., Kreutz, E.W., Ollier, B., Pirch, N., Rozsoki, M., ...
The melting of sandcast and chillcast AlSilOMg alloys with CO2 laser radiation is investigated as a fuction of processing variables to improve the surface properties with respect to wear resistance...
Schmelzen von thermoplastischen Kunststoffen mit IR-Laserstrahlung (1990)
Kreutz, E.W., Pütz, H., Rest, H., Klein, R.
The melting of thermoplastic plastics with and without fibre reinforcement is investigated during the influence of Nd:YAG and CO sub 2 laser radiation. Absorption measurements as a function of...
Removal and drilling of metals by eximer laser radiation. (1990)
Schulze, W., Kreutz, E.W., Poprawe, R.
Drilling of metals by excimer laser radiation is influenced mainly by the generated surface plasma, which absorbs a reasonable part of the incident laser radiation. The recoil of the expanding plasma...
Laserstrahlunterstütztes PVD-Verfahren. FKZ 13 N 5611 (1990)
Kreutz, E.W., Krösche, M., Sung, H., Voss, A., Leyendecker, T., Lemmer, O., ...
Auf Oberflächen metallischer Werkstoffe werden mit einem laserstrahlungsunterstützten PVD-Verfahren (LPVD-Verfahren) Hartstoff- und Keramikschichten aufgebracht. Eine LPVD-Versuchsanlage erlaubt...
Investigations of transmitting optical components for CO2-laser-radiation (1990)
Kreutz, E.W., Lang, B., Risters, R.
Since the early days of laser physics and laser radiation sources the optical components such as mirrors, windows, output couplers, beamsplitters and lenses limit the performance of high power and...
Beam guiding and shaping for surface processing with laser-radiation (1990)
Gasser, A., Kreutz, E.W., Wissenbach, K.
Laser radiation has found a wide range of applications as a machining tool for various kinds of materials processing. The machining geometry, the workpiece geometry, the material properties and the...
Photonics in materials processing with laser radiation. (1989)
Gasser, A., Wissenbach, K., Kreutz, E.W.
Thermography, photography and spectroscopy in combination with studies on optical and structual properties via probe laser and diffraction are outlined as photonic tools in order to investigate with...
Oxidation behaviour of alloy 713 coated with Y, Ce, or Hf using laser glazing technique (1989)
Wissenbach, K., Gasser, A., Kreutz, E.W., Khanna, A.S., Quadakkers, W.J., Schuster, H.
Laser glazing was carried out on Alloy 713 after coating with yttrium, cerium or hafnium. Compounds rich in aluminium and the coated material were detected on the laser treated surface. Both the...
Momentum transfer of an inert gas jet to a free surface of a molten pool (1989)
Pirch, N., Schulz, W., Becker, D., Kreutz, E.W.
It can be said in summarizing, that, on the one hand, sensor technology is so far developed today that automatic fabric inspection can more than ever be regarded as feasible. In addition, the...
Laser radiation - a versatile tool for surface processing (1989)
Wissenbach, K., Gasser, A., Kreutz, E.W.
The basic physical processes of surface processing with laser radiation are shortly outlined. For low power densities energy transfer by heat conduction and mass transfer by diffusion are dominant...
Beschichten mit Co2-Laserstrahlung (1989)
Gasser, A., Kreutz, E.W., Wissenbach, K.
Surface treatment with additive materials was investigated using high power CO sub 2 laser radiation. Different techniques like alloying of steels, densification of thermally sprayed layers, laser...
Werkstoffbearbeitung mit Laserstrahlung. Tl.9. Oberflächenveredelung (1988)
Drenker, A., Gasser, A., Gillner, A., Kreutz, E.W., Pflüger, S., Wissenbach, K., ...
Zunehmend werden die spezifischen Eigenschaften der Laserstrahlung fuer eine gezielte Verbesserung der Oberflaecheneigenschaften verschiedener Werkstoffe hinsichtlich Ermuedung, Verschleiss,...
Verdichten von thermisch gespritzten Schichten mit C02-Laserstrahlung (1988)
Gasser, A., Kreutz, E.W., Leibrandt, S., Wissenbach, K.
CO2 laser radiation has been employed for remelting of thermally sprayed layers on steel surfaces. The remelting was performed as a function of processing parameters with different power densities...
Trends in materials processing with laser radiation (1988)
The objectives of reactive chemical and nonreactive thermal processing with laser radiation are outlined giving indication that processing with laser radiation is governed by a hierarchy of time...
Physical aspects of surface processing with laser radiation (1988)
Gasser, A., Kreutz, E.W., Wissenbach, K.
Energy coupling, heat conduction, melting; evaporation and plasma generation including melt-, vapor- and plasma dynamics as basic physical processes for surface processing with laser radiation are...
Methods of adaptive control in surface processing with laser radiation (1988)
Bieler, H.W., Gasser, A., Kreutz, E.W., Seelhorst, J., Sokolowski, W., Wissenbach, K., ...
Die physikalischen Prozesse der Bearbeitung von Werkstoffen mit Laserstrahlung mit Temperatur-Zeit-Verläufen im Solidus- und Liquidus-Bereich einschliesslich Verdampfung und Plasmabildung werden...
Gaslegieren von TiAl6V4 mit C02-Laserstrahlung (1988)
Gasser, A., Kreutz, E.W., Schwarz, M., Wissenbach, K.
Beim Gaslegieren von TiAl6V4 mit einem Gemisch aus Argon und Stickstoff werden in Abhängigkeit von den Verfahrensparametern Nitriertiefen zwischen 50-500 mym erreicht. Entscheidende Voraussetzung...
Umschmelzen von Guß mit CO2-Laserstrahlung (1987)
Wissenbach, K., Gasser, A., Kreutz, E.W., Gillner, A.
Laser surface melting of an alloy cast iron containing undercooled spheriodal graphite was investigated using high power CO2 laser radiation by variation of laser power, beam distribution, beam...
Oberflaechen metallischer Bauteile mit Laserstrahlen veredeln (1987)
Kreutz, E.W., Gasser, A., Gillner, A., Wissenbach, K.
Laserstrahlung bietet vielfaeltige Moeglichkeiten zum Veredeln der Oberflaeche metallischer Bauteile. Beispielhafte Bearbeitungen sind das Umwandlungshaerten, das Randschichtumschmelzen, das...
Laser surface alloying of Cr3C2, Cr3C2/NiCr and WC/CO layers on low carbon steel (1987)
Gasser, A., Wissenbach, K., Gillner, A., Kreutz, E.W.
By laser surface alloying of different elements or alloys it is possible to improve the corrosion and wear resistance of low carbon steels. Unalloyed steels reveal properties of high alloyed steels....
Laser surface alloying of Cr3C2, Cr3C2/NiCr and WC/CO layers on low carbon steel (1987)
Gasser, A., Wissenbach, K., Gillner, A., Kreutz, E.W.
By laser surface alloying of different elements or alloys it is possible to improve the corrosion and wear resistance of low carbon steels. Unalloyed steels reveal properties of high alloyed steels....
Laser gas alloying of TiAl6V4 with high power CO2-laser radiation (1987)
Gasser, A., Gillner, A., Wissenbach, K., Bieler, H.W., Kreutz, E.W., Schwarz, M.
Gaseous alloying of TiAl6V4 in a mixture of Nitrogen and Argon in order to produce TiN-rich remolten surface layers was investigated with cw and pulsed CO2-laser radiation as a function of processing...
Capillary waves and energy coupling in laser material processing (1987)
Gasser, A., Höltgen, B., Kreutz, E.W., Treusch, H.G., Herziger, G.
Härten mit Elektronen- oder Laserstrahlen. Ein Systemvergleich (1985)
Gillner, A., Kreutz, E.W., Wissenbach, K., Beyer, E., Herziger, G.
Electron beam and laser beam processes with average power in kW area up to mys zone are increasingly used in the metalworking industry to divide the viscosity function of the basic material from the...
Energy coupling in transient laser processing (1985)
Gillner, A., Kreutz, E.W., Treusch, H.G., Wissenbach, K., Herziger, G.
Einschmelzlegieren mit Hochleistungslagern (1985)
Gillner, A., Gasser, A., Wissenbach, K., Kreutz, E.W., Amende, W.
Comparison of laser and electron beam welding (1985)
Wissenbach, K., Kreutz, E.W., Beyer, E., Herziger, G., Hoellt, C.
Electron beam and laser beam welding are very similar. Both are processes with a high beam intensity which are responsible for a deep welding effect. However, these processes employ different...
Photoelectric specvtroscopy of oxide surface layers / E. W. Kreutz (1976)
Separata: Thin soild films, 36, pp. 257-260, 1976