Coherent operates a high-performance excimer laser system for processing large surfaces in partnership with the Fraunhofer Institute for Laser Technology ILT in Aachen, Germany. Using the short-wave laser system, the partners aim to develop new methods for carefully controlled surface processing. Preparation of CFRP adhesive surfaces is just one example of the numerous potential applications.
In the last few years, the rapid growth in display manufacture for mobile devices has ushered in a considerable renaissance for excimer lasers. Operating in the UV range, they allow precise modification of silicon as well as ablation of ultra-thin polymer layers using the laser lift-off process. However, the potential applications of this laser technology are far from exhausted.
Handover of the Coherent system LineBeam 155 to Fraunhofer ILT.
© Fraunhofer ILT, Aachen, Germany / A. Steindl
In a collaborative project spanning several years, Coherent and Fraunhofer ILT plan to develop novel procedures with the excimer laser. To this end, Coherent has provided a research team from Fraunhofer ILT with a line beam system.
The system’s laser line is 155 mm long, 0.3 mm wide, and its stabilized UV output at a wavelength of 248 nm is more than 150 W. A masked imaging system can also be connected, if required. UV radiation has a short wavelength and each laser pulse can reach an energy of more than 1 J, allowing both removal of various materials at a micrometer resolution and rapid, selective processing of layer systems in the micro- and nanometer range. “No other system can match this combination of precision and processing speed,” says Dr. Ralph Delmdahl, Coherent’s Product Marketing Manager.
New laser processes also suitable for lightweight construction
“Our goal is to qualify new applications and new materials that can be subsequently scaled up for industrial production,” explains Dr. Arnold Gillner, Head of Ablation and Joining at Fraunhofer ILT. One of the first areas of focus is processing of fiber composites.
The excimer laser, for instance, can be employed for carefully controlled and precise preparation of carbon fiber reinforced plastic (CFRP) adhesive surfaces. Another application is large-surface removal of release layers in the production of CFRP components.
This might have as much potential in aviation as it has in shipbuilding. Targeted modification of surfaces is a further goal of the cooperation. Such modification provides technical components with additional functionalities, which could otherwise be manufactured only with the aid of expensive coatings.
Crucially, the low penetration depth of the UV radiation enables the surface to be functionalized at the same time as maintaining a very low heat input. This makes the excimer laser, due to its very short wavelength, superior even to new ultrashort pulse lasers.
The potential applications are extremely diverse. In addition to evaluating procedures for processing strategies, the laser can also be used to investigate novel materials for their machinability. One possible application is the efficient production and modification of nanoscale graphene layers, in which the short wavelength of 248 nm – and the associated high photon energy – plays a decisive role.
Research projects like these indicate that Coherent and Fraunhofer ILT are looking to the long-term in their collaboration. Both partners can use the system jointly with their customers for projects. This provides small and medium-sized companies, in particular, with a potential technological basis to develop new products with innovative functionalities.
Dipl.-Phys. Christian Hördemann
Micro and Nano Structuring Group
Telephone +49 241 8906-8013
Petra Nolis M.A. | Fraunhofer-Institut für Lasertechnik ILT
A factory to go
04.07.2018 | Fraunhofer Institute for Manufacturing Engineering and Automation IPA
New kinematics for milling – customized, high-precision manufacturing
04.07.2018 | Fraunhofer-Gesellschaft
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
Sizes and shapes of nuclei with more than 100 protons were so far experimentally inaccessible. Laser spectroscopy is an established technique in measuring fundamental properties of exotic atoms and their nuclei. For the first time, this technique was now extended to precisely measure the optical excitation of atomic levels in the atomic shell of three isotopes of the heavy element nobelium, which contain 102 protons in their nuclei and do not occur naturally. This was reported by an international team lead by scientists from GSI Helmholtzzentrum für Schwerionenforschung.
Nuclei of heavy elements can be produced at minute quantities of a few atoms per second in fusion reactions using powerful particle accelerators. The obtained...
A team headed by the TUM physicists Alexander Holleitner and Reinhard Kienberger has succeeded for the first time in generating ultrashort electric pulses on a chip using metal antennas only a few nanometers in size, then running the signals a few millimeters above the surface and reading them in again a controlled manner. The technology enables the development of new, powerful terahertz components.
Classical electronics allows frequencies up to around 100 gigahertz. Optoelectronics uses electromagnetic phenomena starting at 10 terahertz. This range in...
Russian researchers together with their French colleagues discovered that a genuine feature of superconductors -- quantum Abrikosov vortices of supercurrent -- can also exist in an ordinary nonsuperconducting metal put into contact with a superconductor. The observation of these vortices provides direct evidence of induced quantum coherence. The pioneering experimental observation was supported by a first-ever numerical model that describes the induced vortices in finer detail.
These fundamental results, published in the journal Nature Communications, enable a better understanding and description of the processes occurring at the...
03.07.2018 | Event News
28.06.2018 | Event News
28.06.2018 | Event News
05.07.2018 | Machine Engineering
05.07.2018 | Studies and Analyses
05.07.2018 | Life Sciences