Oliver Suttmann

Oliver Suttmann
Laser Zentrum Hannover e.V. | LZH · Department of Production & Systems Technology

Dr.-Ing.

About

87
Publications
11,139
Reads
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792
Citations
Citations since 2017
29 Research Items
701 Citations
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
Additional affiliations
May 2013 - present
Laser Zentrum Hannover e.V.
Position
  • Head of Production & Systems Department
April 2007 - April 2013
Laser Zentrum Hannover e.V.
Position
  • Researcher

Publications

Publications (87)
Chapter
Photonische integrierte SchaltungenFotonische integrierte Schaltungen (PICs) (PICs) sind elektronischen Schaltungen bezüglich Datenübertragungsrate und elektromagnetischer Verträglichkeit überlegen. Obwohl sich einige Forschungsgruppen mit dem Drucken optischer Wellenleiter und der Integration von Strahlquellen auf das Substrat beschäftigen, ist di...
Conference Paper
There is an increasing demand for highly integrated optical and optoelectronical devices that provide active laser emission, adaptability and low losses. A well-established production technology for customized structures with high functionality and geometrical flexibility is additive manufacturing (AM). Commercial AM systems for metals and polymers...
Article
In automobile and aviation industries, composite materials are the key to lightweight efficiency. Composites containing carbon fiber reinforcements are of particular interest due to their supreme stiffness-to-weight-ratio, but the machining of this material class is still a challenge in production, rework, and repair. Laser technology presents a po...
Article
Conventional stereolithography uses a bath based system, in which a constant layer thickness is applied to realize 3D printing. This approach limits the fabrication of parts consisting of one material only. To overcome this issue, the authors developed a new approach for additive manufacturing using UV curing polymers. In a two step layer-by-layer...
Article
Today, fiber reinforced materials are present in a wide field of industrial applications. Short glass fiber reinforced composites are used in automotive, aerospace, and medical sectors. In the last couple of years, fiber reinforced thermoplastics have gained importance as a construction material, especially for lightweight assembly. There are diffe...
Article
We describe a novel multi-material polymer layer creation principle and deposition strategy based on aerosol jetting. In a multiple atomizer set-up, acrylates and methacrylates comprising a hardness of 25–80 ShoreD are deposited in a layer based process with a resolution range of 7.4–548.3 μm. The materials are transformed into droplets independent...
Article
Full-text available
Polydimethylsiloxane (PDMS) is widely used for bio-medical, optical and microfluidic applications. Hence, PDMS layers on free-form surfaces on defined areas are needed. Conventional ways such as spin coating show drawbacks by long processing time and no sufficient application on free form surfaces. In this work, laser direct writing with UV-curable...
Conference Paper
This paper shows the modeling, simulation and production of polymer optical waveguides using the OPTAVER process. The additive manufactured multimode waveguides with their typical cross-section of a circle shape are of low cost and high-performance.
Article
This work analyzes the fluidic dynamics of the particle extraction function of a nozzle used for the detection of explosives in simulation studies. The nozzle shape with inlet and outlet gas connection is able to extract particles generated by the laser drilling process. Drilling dependent parameters such as the diameter of the generated particles,...
Article
Nowadays, architects are designing buildings with colored glass panes over a range of sizes and shapes for indoor and outdoor glass components. For the production of these surface colored glass panes, only companies with large furnaces for the tempering of the colors can be commissioned. Therefore, the present research work is developing an industr...
Conference Paper
Black marking as micrometer scaled binary coding applied on shafts by ultrashort pulsed lasers with high contrast and without ablation as a non-contact sensor system for combined measurement of angular position and torque.
Chapter
Die Additive Fertigung war in den letzten Jahren einer rasanten Entwicklung unterworfen. Sowohl bei metallischen Bauteilen, als auch bei Polymeren hält dieses Verfahren immer mehr Einzug in die Produktion. Große Unternehmen fertigen bereits täglich Bauteile in additiven Prozessen. Eine große Herausforderung für den Einsatz in der Serienfertigung is...
Article
Full-text available
Functionalization by changing the topography of workpiece surfaces is interesting for many applications. Lasers – especially ultrashort pulse lasers – are flexible tools for this kind of tasks. Besides deterministic structures they allow for processing surfaces in a way that stochastic structures appear. Ripple and spike structures can be fabricate...
Article
Full-text available
Additive manufacturing is used in several industrial sectors where polymers and metals are established materials. Different academic studies prove that additive manufacturing methods can be applied on glass materials using powder or fiber based material sources. In terms of quartz glass, with melting temperatures around 2200°C, laser sources are us...
Article
We experimentally demonstrate the fabrication of silver/polydimethylsiloxane (PDMS) composite microline structures based on the simultaneous induction of the photoreduction of silver ions and the photopolymerization of PDMS using a femtosecond laser. We show that the fabricated line structures exhibit electrical conductivity and that the resistance...
Article
Considering the increasing amount of data for communication and infotainment applications, fabrication of optical networks and bus systems is a challenging task for production engineering. A two-step manufacturing process for polymer optical waveguides is presented. By improving the highly efficient flexographic printing technology by laser functio...
Article
The research for new production chains in the field of waveguide fabrication is a challenging task. Realizing a cost efficient manufacturing process allows integrating optical data communication in arbitrary structures as for example the wing of an airplane or the car body. The production chain described in this paper contains the design, simulatio...
Article
The hybrid technique of aerosol jet printing and ultraviolet (UV) laser direct writing was developed for 2D patterning of thin film UV curable polydimethylsiloxane (PDMS). A dual atomizer module in an aerosol jet printing system generated aerosol jet streams from material components of the UV curable PDMS individually and enables the mixing in a co...
Article
2D/3D structuring of UV curable polydimethylsiloxane (PDMS) was developed using UV laser direct writing. In this technique, commercially available UV curable PDMS was locally polymerized to fabricate 1D and 2D single layer structures, as well as 3D multi-layer structures with sufficient stability in process resolutions. The tightly focused UV laser...
Article
Additive manufacturing with UV curable polydimethylsiloxane (PDMS) was achieved using UV laser direct writing. In these experiments, UV curable PDMS was locally polymerized to fabricate 1D and 2D single layer structures, as well as 3D multilayer structures. Line arrays with line widths between 18 and 47 µm were produced, and it was observed that go...
Article
For some applications of the aerospace and automotive industry, thermoset and thermoplastic composites need to be joined. This material combination cannot be welded because thermoset matrix materials do not melt. In order to apply welding for this material combination, a semi-interpenetrating polymer network (SIPN) layer was generated on the surfac...
Article
Carbon fiber reinforced plastics (CFRP) are of high interest for lightweight construction within many industrial sectors. Although knowledge about the laser processing of CFRP is continuously increasing, deeper process knowledge is of importance for the development of automatable and controllable industrial processes. Furthermore, new laser sources...
Article
Full-text available
Automated laser welding with filler wires for bridging gaps and for connecting complex devices has been established for different metal materials. In spite of that, it is still a challenge to transfer this welding process to the brittle material glass. Therefore, glass welding is often realized through a manual process by heating the glass with a g...
Chapter
In diesem Beitrag wird das neuartige additiven Herstellungsverfahren der Hybriden μ-Stereolithographie vorgestellt. Es vereint die Vorteile eines herkömmlichen Stereolithographieprozesses mit der Beschichtungstechnologie des Aerosol-Jet-Druckens. Die neuartige Beschichtungstechnologie des Aerosol-Jet-Druckens ist in der Herstellung von leitfähigen...
Article
Full-text available
We used two novel approaches to produce sub-wavelength structure (SWS) anti-reflection coatings (ARC) on silicon for the millimeter and sub-millimeter (MSM) wave band: picosecond laser ablation and dicing with beveled saws. We produced pyramidal structures with both techniques. The diced sample, machined on only one side, had pitch and height of 35...
Article
Full-text available
Presently, fiber reinforced materials are used for many industrial applications. Laser transmission welding (LTW) is a suitable method to join these materials. For multiple thermoplastics, the weld seam quality is affected by the amount of moisture content in the joining members. For LTW, heat is applied to the welding members and water in the comp...
Article
Full-text available
For the development of a robot based laser cutting process of automotive 3D parts consisting of carbon fibre reinforced plastics (CFRP), investigations with a newly developed fibre guided nanosecond pulsed laser with an average power of PL = 1.5 kW were conducted. In order to investigate the best combination of quality and process time 2 different...
Article
Full-text available
A double-scan-head was developed combining two pairs of galvo-mirrors into one device. One pair controls the laser beam's position, while the other in this setup is used for a pyrometer. Thus, a pyrometer's optical path can be controlled independently from a laser's path as well as being locked to the same geometrical path during CFRP processing.
Article
Full-text available
This work presents a laser based bridge balancing method for strain sensor circuits which are applied directly on component surfaces by means of thin film deposition and laser patterning. The balancing process is integrated in the patterning process and consists of iterative cycles of laser scanning and bridge measurement operations until a balance...
Article
Ultra-short pulsed laser processing is a potent tool for microstructuring of a lot of materials. At certain laser parameters, particular periodical and/or quasi-periodical μm-size surface structures evolve apparently during processing. With extended plasmonics theory, it is possible to predict the structure formation, and a systematic technology ca...
Conference Paper
This paper describes the effect of laser structured printing forms that are used in flexographic printing processes. This adaption is developed to optimize the conditioning of flexible polymer substrates for the downstream application of optical waveguides.
Article
Full-text available
Strengthened glass is used for display applications because of its high resistance to scratch damage. The high strength is the result of an ion exchange, which leads to a change of the glass structure and therefore the range of compressive stresses in the glass surface increases. These stresses make laser processing of this type of glass more diffi...
Article
Full-text available
Ablation of thin metal films with laser pulses having a pulse duration shorter than the electron-phonon relaxation time, so called ultrashort laser pulses, enables melt-free patterning of arbitrary geometries. Ablation with ultrashort laser pulses is an emerging process and is currently used in the field of microelectronics for the repair of photol...
Article
Full-text available
Carbon fiber reinforced plastics (CFRP) are of high interest as a lightweight material due to their high strength-to-weight ratio. Within industrial fields with a requirement on lightweight design and energy efficiency, the demand of CFRP increases continuously. Up to now, the cutting of CFRP, as a basic production step within the production of com...
Article
Full-text available
Fiber reinforced materials are present in a wide field of industrial applications, due to their good strength-weight-ratio. This is especially true for thermoplastic composites, which have the advantage of high impact tolerances, quick forming processing capability, and weldability. These materials can be joined, for example, by laser transmission...
Article
We report on the first use of laser ablation to make submillimeter, broadband, antireflection coatings (ARCs) based on subwavelength structures (SWSs) on alumina and sapphire. We used a 515 nm laser to produce pyramid-shaped structures with a pitch of about 320 μm and a total height of near 800 μm. Transmission measurements between 70 and 140 GHz a...
Conference Paper
Pulsed laser sources with pulse durations in the millisecond regime can be used for spot welding and seam welding of aluminum. Seam welds are generally produced with several overlapping spot welds. Hot cracking has its origin in the solidification process of individual spot welds which determines the cracking morphology along the seam welding. This...
Conference Paper
The application of thin borosilicate glass as interposer material requires methods for separation and drilling of this material. Laser processing with short and ultra-short laser pulses have proven to enable high quality cuts by either direct ablation or internal glass modification and cleavage. A recently developed high power UV nanosecond laser s...
Chapter
Laserbasierte additive Fertigungsverfahren haben eine hohe industrielle Relevanz, da sie Defizite von konventionellen Verfahren wie geringe Festigkeiten im Bauteil und die Auflösung überwinden. Laserstrahlung ist hochenergetisch, gut fokussierbar und im Prozess leicht zu führen, wodurch eine lokale Interaktion der Strahlung mit dem Werkstoff erziel...
Article
Alumina, sapphire and silicon optical elements are used for the detection of cosmic microwave background radiation with its peak intensity between 0.5 and 10 mm. The reflectivity of such material is high but can be reduced with sub-wavelength structures acting as an anti-reflective coating. Required structure height of over 1 mm can be produced by...
Conference Paper
Full-text available
Automated laser welding with filler wires for bridging gaps and for connecting complex devices has been established for different metal materials. In spite of that, it is still a challenge to transfer this welding process to the brittle material glass. Therefore, glass welding is often realized through a manual process by heating the glass with a g...
Article
Micromachining using ultra-short pulsed laser radiation can be used to manipulate matter without interacting with the surrounding matter. This ideal processing, called “cold ablation”, is attributed to picosecond and femtosecond laser radiation, and nowadays there are applications in some special industrial processes. But ultrafast laser radiation...
Article
High-speed observation of visible and infrared radiation was performed to measure the molten pool geometry, velocity of the solid-liquid interface and temperature profile during laser spot welding of aluminum. Hot cracking occurred at a late stage of solidification for the investigated laser pulse shapes. Hot cracking could be minimized by using a...
Article
A strong criterion in the evaluation of laser-cut carbon fibre reinforced plastics is the thermal damage of the material. The visible heat affected zone is used as an indicator for the deterioration, which can be measured by destructive methods only. For the purposes of this paper, a non-destructive and contactless heat affected zone estimation met...
Article
In this paper investigations on the effect of the moisture content of thermoplastic CFRP on the laser induced heat affected zone (HAZ) and the resulting in-plane shear properties are presented. For this purpose carbon fibre reinforced polyetherimide (PEI) and polyphenylene sulphide (PPS) sheets were conditioned to different moisture contents and we...
Article
Full-text available
Thermoplastic composite structures based on continuous carbon fiber reinforcements are gaining importance in many industrial applications. These comprise basic technical functions as well as high-performance applications in the aerospace sector. Welding techniques are applicable for composites based on thermoplastic matrix materials in contrast to...
Article
The influence of laser pulse parameters on solidification conditions and hot crack formation in pulsed laser welding of Al6082 aluminum alloys was studied with the aid of high-speed cameras capturing visible and infrared radiation. Hot cracking was evaluated with respect to strain rate, strain, and metallurgical outcome. The strain rate was approxi...
Article
Full-text available
Thin film deposition and laser patterning enable production of integrated electronic thin film sensors on component surfaces. The process consists of two major processing steps: In a first step the component surface is deposited by isolation and sensor films. The sensor film is subsequently patterned by a scanning laser beam in order to generate st...
Article
Full-text available
Laser cutting of CFRP lightweight parts has the advantages of a contact-free, automatable and flexible processing for a prospective series production. For the development of strategies for laser cutting of carbon fibre reinforced plastics (CFRP), different scientific approaches exist to achieve a process with small heat affected zones (HAZ), and hi...
Article
Full-text available
Carbon fiber reinforced plastics (CFRP) show high potential for use in lightweight applications not only in aircraft design, but also in the automotive or wind energy industry. However, processing of CFRP is complex and expensive due to their outstanding mechanical properties. One possibility to manufacture CFRP structures flexibly at acceptable pr...
Article
Full-text available
Transparent Conducting Oxides (TCOs) are widespread as transparent electrodes in thin film photovoltaics and electronics. Post deposition furnace annealing improves the electrical and optical properties of TCOs. Disadvantages of furnace annealing are large energy consumption and long processing time due to long-lasting heating ramps. ZnO:Al thin fi...
Article
Full-text available
Laser transmission welding can be used to join endless fibre reinforced thermoplastics. The welding temperature is affected by the heat conduction along carbon fibresand depends on the local orientation of the fibres in the weld seam and the laser welding technique itself. In these investigations the heat development during the welding with quasi-s...
Article
Full-text available
High temperature applications of printed circuit boards (PCB)require materials with specifically adapted properties. Hence, conventional electrically isolating glass fiber and epoxy-resin materials have to be replaced by thin borosilicate glass.Therefore, an industrially suitable process to remove the metal coatings from the brittle thin glass has...
Article
Double pulse laser welding is investigated to reduce hot cracking in 6082 aluminium alloy welds. Therefore, Nd:YAG and diode laser pulses are superimposed and synchronised with a specific delay. The diode laser heats the parent metal and weld metal during weld spot solidification to compensate for solidification shrinkage and thermal contraction. T...
Article
We have developed an advanced micro-stereo-lithography process combined with single photon polymerization and aerosol jet printing technology to facilitate layer based photo-polymerized structuring by layer on a non-flat surface, which is not possible by conventional macro- or micro- stereo-lithography. The aerosolized photo-sensitive polymer retai...
Conference Paper
Continuous carbon fibre reinforced composites (CFRP) are recognized as having a significant lightweight construction potential for a wide variety of industrial applications. However, a today‘s barrier for a comprehensive dissemination of CFRP structures is the lack of economic, quick and reliable manufacture processes, e.g. the cutting and trimming...
Conference Paper
Current trends of intelligent products and controlled processes show an increasing need for long-living sensors. Metal thin-film strain gauges are suitable for monitoring mechanical loads over the entire lifetime of a component. However, existing manufacturing methods can only pattern these gauges on flat components and in large quantities to ensur...
Article
Cutting or drilling of carbon fiber reinforced plastics (CFRP) components is required, for example, when a component needs to be trimmed or prepared for rivets. Lasers can be a very attractive tool for drilling and cutting fiber-reinforced plastics, as they have already been successfully used in sheet metal processing: laser light is non-wear and n...
Conference Paper
Ultra-short pulsed laser radiation applied on silicon decreases the reflectivity by modifying the surface topology by ablation to achieve a so called ``black silicon'' texture. A multitude of laser processing parameters are investigated in order to classify the reflectivity reduction. Exemplarily, 5-inch mc-silicon solar wafers are machined in a fi...
Conference Paper
Continuous carbon fibre reinforced plastics (CFRP) are recognized as having a significant lightweight construction potential for a wide variety of industrial applications. However, a todays barrier for a comprehensive dissemination of CFRP structures is the lack of economic, quick and reliable manufacture processes, e.g. the cutting and drilling st...
Article
The ultra-precision dicing of hard and brittle materials causes high wear on the abrasive tool which results in the deterioration of blade cross section as well as the decrease of diamond grain exposure. Resin-bonded diamond blades are used due to their in-process self-sharpening capability. Nevertheless, the shape of the blade cross section genera...
Conference Paper
Owing to their chemical resistance, fused silica and borosilicate are used for many applications in the chemical and medical industries. The flat or hollow glass components are welded to complex devices. State of the art is a manual process using a gas flame. For the welding of complex quartz and borosilicate glass devices, the manual process must...
Conference Paper
For the detection and evaluation of hot cracks during pulsed micro welding a quality monitoring system is demonstrated consisting of an automatic spot measurement (ASM) and a hot crack monitor (HCM). The ASM represents a tool for tracking the superposition of two laser foci which have been engaged for diode-laser-enhanced micro welding of delicate...
Conference Paper
This study analyzes laser processing of glass-based printed circuit boards which have the capability to replace conventional substrate materials when electronics are required to operate at elevated temperatures. There is significant potential for glass-based circuit boards within the field of aerospace and electric mobility. The new circuit board c...
Conference Paper
Carbon-fibre reinforced plastics (CFRP) and glass-fibre reinforced plastics (GFRP) are widely used for components in the aviation and wind energy industries and suffer from damages or wear during operation. As soon as automobiles containing CFRP parts will go into large batch production and enter the market in the near future, the need for reliable...
Article
Cutting of hard and brittle materials as Sintered Silicon Carbide SSiC is an obstacle for implementing SSIC into MEMS applications. Wear and accuracy loss of resin-bonded diamond blades are significant. In contrast, metal-bonded diamond blades have a better shape accuracy during dicing of SSiC but require frequent dressing to renew the worn-out dia...
Conference Paper
Cutting of hard and brittle materials as Sintered Silicon Carbide SSiC is an obstacle for implementing SSIC into MEMS applications. Wear and accuracy loss of resin-bonded diamond blades are significant. In contrast, metal-bonded diamond blades have a better shape accuracy during dicing of SSiC but require frequent dressing to renew the worn-out dia...
Article
Thin film strain sensors applied directly on machine components provide high reliability. However, sensors patterned by standard photolithographic processes are limited to planar surfaces. To overcome these limitations we developed a 3-D capable direct patterning process for NiCr thin film sensors based on ultrafast lasers and galvanometer scanners...
Article
A femtosecond laser patterning process of thin film sensors on component surfaces is reported. This method is particularly useful for patterning of strain sensors which are sputter deposited direct-ly on curved surfaces. The ablation behavior of NiCr film irradiated by femtosecond laser pulses at non-normal angles of incidence is modeled and experi...
Article
Full-text available
This paper concentrates on the characterisation of the ablation process of thin strain sensitive NiCr films deposited on Al 2 O 3 substrates. The optical skin depth of NiCr (80/20) is identified. Re-moval experiments with single and multiple pulse point ablations are carried out on Al 2 O 3 bulk sub-strates with different NiCr thicknesses. The expe...
Article
We report on ablation experiments of sputter deposited thin film systems of NiCr and Al2O3 for the fabrication of strain sensors. To ensure proper functionality of the electrical circuits, the metal film has to be selectively removed while damage in the Al2O3 films has to be avoided. Damage thresholds of the Al2O3 layer are investigated and damage...
Chapter
The following chapter provides an overviewon laser basedmicroprocessing in different industrial applications. Depending on the used parameter regime, the systems technology and optics and the laser source applications like drilling, precise cutting, marking, or microjoining can be realized. Besides describing the specific laser material interaction...