A5055656228- Laser Material Processing Techniques
- Welding Techniques and Residual Stresses
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Additive Manufacturing Materials and Processes
- Advanced Surface Polishing Techniques
- Nanofabrication and Lithography Techniques
- Advanced machining processes and optimization
- Flexible and Reconfigurable Manufacturing Systems
- Additive Manufacturing and 3D Printing Technologies
- Manufacturing Process and Optimization
- Advanced Fiber Optic Sensors
- Advanced Manufacturing and Logistics Optimization
- Advanced Welding Techniques Analysis
- High Entropy Alloys Studies
- Laser and Thermal Forming Techniques
- Advanced Fiber Laser Technologies
- Advanced Measurement and Metrology Techniques
- Surface Roughness and Optical Measurements
- RFID technology advancements
- Laser-induced spectroscopy and plasma
- Metal Alloys Wear and Properties
- Engineering and Materials Science Studies
- Physics and Engineering Research Articles
- Planetary Science and Exploration
Leibniz University Hannover
2016-2025
Laser Zentrum Hannover
2015-2024
Institut fuer Integrierte Produktion Hannover (Germany)
2013-2024
Institut für Automatisierung und Informatik
2010-2024
Phoenix Contact (Germany)
2023
Gottfried-Wilhelm-Leibniz-Gesellschaft
2022-2023
Institute of Automation
2023
Photonics (United States)
2023
University of Notre Dame
2021
RWTH Aachen University
2021
The MaterialDigital initiative represents a major driver toward the digitalization of material science. Next to providing prototypical infrastructure required for building shared data space and working on semantic interoperability data, core focus area Platform (PMD) is utilization workflows encapsulate processing simulation steps in accordance with findable, accessible, interoperable, reusable principles. In collaboration funded projects initiative, workflow group strives establish...
This work presents time-resolved images of femtosecond-laser-induced melt dynamics in 60 nm gold films on glass substrates. Melt induced by laser radiation with focus diameters 6 μm and 8 (FWHM) at constant fluence is investigated a temporal resolution 10 ns. In both cases, the formation microbumps jets takes least 250 It shown that process can be compared to jetting behavior cavitation bubbles near free liquid surface. confirmed SEM illustrating re-entrant spike through hole microbump.
We developed an all-fiber component with a signal feedthrough capable of combining up to 6 fiber-coupled multi-mode pump sources maximum power 400 W at efficiencies in the range 89 95%, providing possibility transmitting high forward and reverse direction. Hence, fiber combiner can be implemented almost any laser or amplifier architecture. The complete optical design was based on ray tracing simulations confirmed by experimental results.
Laser cladding has become an established technology for parts repair and surface modification cost-intensive components. Due to ongoing improvements of laser sources, process strategy, the range applications deposition processes is continuously increasing. Critical issues as well performance economic efficiency problems have been solved in recent years. Consequently big advances done cladding, from micro macro, low- high power hybrid processes.
Low noise, high power single-frequency lasers and amplifiers are key components of interferometric gravitational wave detectors.One way to increase the detector sensitivity is injected into interferometers.We developed a fiber amplifier engineering prototype with pump limited output 200 W at 1064 nm.No signs stimulated Brillouin scattering observed W.At maximum polarization extinction ratio above 19 dB fractional in fundamental transverse mode (TEM 00 ) was measured be 94.8 %.In addition,...
In this paper, approaches for the realization of high-resolution periodic structures with gap sizes at sub-100 nm scale by two-photon polymerization (2PP) are presented. The impact laser intensity on feature and surface quality is investigated. influence different photosensitive materials structure formation compared. Based elliptical geometry character voxel, authors present an idea to realize less than 100 controlling focus position respect glass substrate. This investigation covers...
Abstract Mankind is setting to colonize space, for which the manufacturing of habitats, tools, spare parts and other infrastructure required. Commercial processes are already well engineered under standard conditions on Earth, means Earth’s gravity atmosphere. Based literature review, additive lunar space gravitational have only been researched a very limited extent. Especially, offers many advantages, as it can produce complex structures while saving resources. The materials used do not be...
Abstract The advancement of micro- and nanostructuring techniques in optics is driven by the demand for continuous miniaturization high geometrical accuracy photonic devices integrated systems. Here, UV-LED projection photolithography demonstrated as a simple low-cost approach rapid generation two-dimensional optical nanostructures with resolution using standard only. developed system enables structure patterns onto substrate 1000-fold demagnification. Photonic devices, e.g., waveguides...
Additive manufacturing of magnesium alloys shows great potential for producing patient‐specific resorbable implants or lightweight parts. However, due to the reactive behavior, especially in laser‐based powder bed fusion (PBF‐LB) fabrication process, processing window manufacture almost pore‐free parts is narrow compared other materials such as titanium steel. This article investigates optimal conditions PBF‐LB/M WE43. To reduce reactivity melt by limiting interaction with remaining oxygen,...
Non-destructive, three-dimensional imaging techniques are of great importance in medicine as well technical analysis. In this context, it is particular to generate reliable and repeatable results high quality. This can be aided by automation manual processes. One these techniques, the Scanning Laser Optical Tomography, currently requires sample alignment user achieve highest possible image demands skillful hand-eye coordination experience on part user, thus often leads inconsistent results....
Planar optronic sensor systems are networks of integrated light sources, detectors and sensors, connected by optical waveguides on thin polymer films. This way, can be realized completely optically for measuring quantities such as temperature, strain or chemical concentration. Applications unfold in structural health monitoring analysis. Waveguides represent a key element this concept signal transmission the integration interacting system components. The cost-effective high-throughput...
Carbon fiber reinforced plastics (CFRP) are of high interest as a lightweight material due to their strength-to-weight ratio. Within industrial fields with requirement on design and energy efficiency, the demand CFRP increases continuously. Up now, cutting CFRP, basic production step within composite parts, is mainly performed by conventional techniques such milling abrasive water jet cutting. These known have drawbacks, e.g., force input, handling auxiliaries, tool wear. The laser has...
Design studies for the next generation of interferometric gravitational wave detectors propose use low-noise single-frequency high power laser sources at 1064 nm. Fiber amplifiers are a promising design option because their output and excellent optical beam properties. We performed filled-aperture coherent combining with independently amplified beams from two high-power fiber to further scale available power. An approximately 400 W efficiency more than 93% was achieved. The combined...
We analyse and evaluate the sensitivity robustness of an eccentric fiber Bragg grating sensor micro-structured into a polymer optical under different relative humidity, temperature, strain torsion conditions. Relative humidity temperature conditions are established with climate test chamber prepared salt solutions. Though made polymer, cross-sensitivity to is low, enabling usage in rapidly changing environment applications, e.g., for movement detecting gloves or vehicles, but also high...