A5039662850- Laser Material Processing Techniques
- Advanced Software Engineering Methodologies
- Model-Driven Software Engineering Techniques
- Software Engineering Research
- Service-Oriented Architecture and Web Services
- Advanced Surface Polishing Techniques
- Business Process Modeling and Analysis
- Nonlinear Optical Materials Studies
- Sociology and Education Studies
- Sports Science and Education
- Ocular and Laser Science Research
- Advanced Fiber Laser Technologies
- Laser-induced spectroscopy and plasma
- Laser Design and Applications
- Laser-Matter Interactions and Applications
- Software Engineering Techniques and Practices
- Software Engineering and Design Patterns
- Web Applications and Data Management
- Digital Innovation in Industries
- Software System Performance and Reliability
- Corporate Governance and Management
- Flexible and Reconfigurable Manufacturing Systems
- Analytical Chemistry and Sensors
- Formal Methods in Verification
- Education Methods and Technologies
Vacuumschmelze (Germany)
2019-2023
Friedrich Schiller University Jena
1991-2021
Software (Germany)
2008
Microsoft (Germany)
2005
Technical University of Munich
1995-2002
Software (Spain)
2001
Umeå University
1976
Unidades Centrales Científico-Técnicas
1962
Consejo Superior de Investigaciones Científicas
1962
Real Academia Española
1962
Abstract A new approach for generating long‐distance self‐healing Bessel beams, which is based on a ring‐shaped (annular) lens and spherical in 4 f ‐configuration, reported. With this, diffraction‐free light evolution of zeroth order beam over several meters shown available scaling opportunities that surpass current technologies by far are discussed. Furthermore, it demonstrated how this setup can be adapted to create superpositions, realizing the longest ever reported optical conveyor...
Ultrashort laser pulses allow for the in-volume processing of glass through non-linear absorption, resulting in permanent material changes and generation internal stress. Across manifold potential applications this technology, process optimization requires a detailed understanding laser-matter interaction. Of particular relevance are deposition energy inside subsequent relaxation processes. In paper, we investigate spatio-temporal evolution free carriers, transfer, modifications volume...
We investigate cutting of transparent materials using ultra short laser pulses with pulse durations in the sub to a few ps regime. All compared methods base on nonlinear absorption including ablation and cleaving or selective etching supported by induced modification inside bulk material. For most experiments samples hardened glass (Corning Gorilla®) thickness up 700 μm were used, sapphire is presented additionally. Absorption volume analyzed detail, aiming for tailored modifications....
Ultrashort laser pulses allow for in-volume processing of glass through non-linear absorption. This results in permanent material changes, largely independent the processed glass, and it is particular relevance cleaving applications. In this paper, a with wavelength 1030 nm, pulse duration 19 ps, repetition rate 10 kHz, burst regime consisting either four or eight pulses, an intra-burst separation 12.5 ns, used. Subsequently, Gaussian-Bessel focal line generated fused silica substrate aid...
We report on a transportable and easy-to-operate optical clock utilizing the 2S1/2 - 2D3/2 transition of single trapped 171Yb+ ion at 436 nm. Developed within pilot project for quantum technology in Germany lead by industry, is set up two 19″ racks. In this way, transportation can easily be realized, large degree automatization allows operation outside highly specialized laboratories applications beyond basic research. Comparisons to existing high-accuracy systems enable verification clock's...
We demonstrate time-resolved tomography with 200 fs resolution for the three-dimensional analysis of non-linear dynamics ultrafast laser-matter interaction inside volume transparent materials. reconstruct as an example spatial distribution transient extinction coefficient induced by focusing higher-order Bessel-Gaussian-beams into Gorilla glass. This approach can be employed to gaseous, liquid and solid state matter which interact laser light.
For the development of industrial NIR ultrafast laser processing transparent materials, absorption inside bulk material has to be controlled. Applications we aim for are front and rear side ablation, drilling inscription modifications cleaving selective etching glass sapphire in sheet geometry. We applied pump probe technology situ stress birefringence microscopy fundamental studies on influence energy duration (100 fs – 20 ps), temporal spatial spacing, focusing beam shaping pulses....
With availability of high power ultra short pulsed lasers, one prerequisite towards throughput scaling demanded for industrial ultrafast laser processing was recently achieved. We will present different approaches machining, including raster and vector based concepts. The main attention is on beam shaping enlarged, tailored processed volume per pulse. Some aspects machining using are discussed. engraving steel full thickness modification transparent materials, two by confined interaction...
We outline and clarify the essential concepts of componentware paradigm. After motivating role formal foundations introducing a number useful description techniques, we propose flexible process model for component based development on patterns. The presented techniques serve as building blocks an overall methodology which is focus our current work.
Ultrashort pulse lasers allow for processing of transparent materials by nonlinear absorption. We report on tailoring the absorption inside glass volume cutting applications. The influences moving breakdown, accumulation and incubation effects are discussed.
The management of a software development project is demanding task. To plan and control the actions participants, existence suitable critical importance. However, elaborating maintaining such based on employed process model typically requires lot manual effort, comprising many tedious error-prone activities. This paper shows how plan-based enactment processes can improve this situation, providing basis for adequate method tool support. presents our approach an integrated formal covering...
Ultrashort pulse lasers enable reliable and versatile high precision ablation surface processing of various materials such as metals, polymers semiconductors. However, when modifications deep inside the bulk transparent media are required, nonlinear material interactions can decrease precision, since weak focusing long propagation intense pulses within may induce Kerr self-focusing, filamentation white light generation. In order to improve those modifications, simultaneous spatial temporal...
The class diagram notation of current graphical object oriented modeling languages does not scale well with the increasing complexity modern systems. To overcome this weakness, we propose concept structured interfaces, a flexible refinement relationship between diagrams and use attribute, operation relation templates to abstract from implementation details. usefulness introduced concepts is illustrated by development case study Web-based distributed editor. Finally, present suggestions for...
The controlled energy deposition by nonlinear absorption of ultrashort laser pulses offers a variety different processing strategies for the machining wide-bandgap materials. Considering laser-glass cutting applications, efficient single pass processes with volume modifications along entire substrate thickness become possible using adapted focal field distributions [1]. required extreme aspect ratios longitudinal (given glass thickness) to transverse (diffraction limit) beam dimensions are...
Time-resolved in-situ microscopy is used to gain insights for tailoring material modifications inside a transparent material. The types of are linked the free electron densities within laser-induced plasma. Densities below 1019cm−3 lead defect states and higher around 1020cm−3 disruptions cracks. In this process plasma ignition densification crucially depends on pulse duration.
With availability of high power ultra short pulsed lasers, one prerequisite towards throughput scaling demanded for industrial ultrafast laser processing was recently achieved. We will present different approaches machining, including raster and vector based concepts. The main attention is on beam shaping enlarged, tailored processed volume per pulse. Some aspects machining using are discussed. engraving steel full thickness modification transparent materials, two by confined interaction...