The Laser Precision Microfabrication Symposium 2020 is very proud to welcome the following plenary speakers:
Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Germany
The Fraunhofer Cluster of Excellence Advanced Photon Sources (CAPS) will overcome USP laser power limitations, but also develop technologies along the process chain from pulse generation to process technology, and real-world applications.
In the presentation we will report on the most recent progress in scaling the average output power of femtosecond lasers beyond the 10kW barrier. Two technological paths will be described, coherently combined fiber amplifiers and the Innoslab approach. System performance as well as future perspectives will be reviewed.
In parallel to the laser sources, beam delivery technology is developed to make effective use of the radiation. While the CAPS-partners develop a range of new technologies, their ambition is actually to make the USP laser a tool with average powers of current CW fiber lasers plus the unique features of USP lasers, including high precision and low or no dependency from the processed material.
Department of Mechanical Engineering, MIT, USA
Advanced manufacturing has become the powerhouse that trigger innovation of intelligent, flexible, customer-oriented product development and new business models in the industrial ecosystem worldwide. Transformation and adaptation of advanced manufacturing technologies, such as 3D printing, artificial intelligence, virtual and augmented reality, the internet of things and next-generation robotics, highlight the importance of data and interconnectivity in the future manufacturing ecosystem. In the meantime, the rapid emergence of ecological constraints calls for integrated functional products and manufacturing solutions that meet the critical societal challenges such as energy efficiency, carbon emission, worker safety, and environmental regulations at large scale. The scientific breakthroughs of data and interconnectivity driven manufacturing may lead to a paradigm shift of meta-manufacturing, that is, design and processing multifunctional elements at unprecedented precision and heterogeneity. In this plenary talk, I will present our research vision towards a library of accurate designer voxels with predictive analytics that capture essential mechanical and physical properties based on the microstructure. These multifunctional elements can be exemplified by the emerging architectured metamaterials with integrated functions that are desirable for a broad array of applications in confined spaces, including impact absorption, thermal management and chemical processing, optical transparency, structural morphing, as well as real time monitoring and repair.
RIKEN Center for Advanced Photonics, Japan
The extremely high peak intensity associated with ultrashort pulse width of femtosecond laser allows us to induce multiphoton absorption with materials that are transparent to the laser wavelength. More importantly, focusing the fs laser beam inside the transparent materials confines the multiphoton absorption only within the focal volume, enabling three-dimensional (3D) micro- and nanofabrication. Flexible micro/nanoprocessing with respect to structure, function, and scale is then possible by femtosecond lasers with accurate control on all 3D environments for both inorganic and organic materials. Combination of different schemes of the 3D processing, so called, hybrid femtosecond laser 3D processing, can further enhance the performance to diversify geometries of the fabricated 3D micro/nanostrucstures with enhanced functionalities. In this talk, our recent activities on advanced femtosecond laser 3D micro/nanoprocessing including fabrication of biochips for mechanism study of cancer cell metastasis and invasion, fabrication of 3D microfluidic surface-enhanced Raman spectroscopy (SERS) sensors for ultratrace analysis, and 3D printing of pure protein microstructures are introduced.
Vrije Universiteit Brussel, Belgium
University of Rochester, USA
While high-power lasers enable laser-driven inertial fusion and high-energy-density–physics experiments, low- power lasers are increasingly used to make and characterize the targets at micro/nanoscales for those experiments. The feature of particular importance is the high power density achievable with femtosecond lasers, which provides the spatial resolution that is needed to apply additive manufacturing and a new generation of characterization techniques to this field. Millimeter-size plastic shells with smooth surfaces and submicrometer cellular (foam) structures are made using the two-photon polymerization process. While this application is in its infancy, the potential to make targets more deterministically, consistently, and efficiently than existing methods is compelling. The goal is to make structures with a surface smoothness 50-nm rms and feature sizes 0.5 ❍m over dimensions up to 5 mm; the process conditions needed to achieve this and the capabilities and current limitations of this technique are described.
A second application of lasers in this field is in the traditional role of ablation to produce structured surfaces and precise pinhole-aperture arrays. These structures are used to increase x-ray emission from a surface and to produce high-resolution imaging systems to better diagnose laser-driven implosions. A third application is to use coherent anti-Stokes Raman spectroscopy (CARS) to produce a 3-D topographical map of the elemental composition of a laser-fusion target. Initial experiments demonstrated micrometer-scale imaging of a 0.9-mm-diam polystyrene shell to identify the presence of voids in the material; this was achieved by sectional imaging to scan horizontal 2-D slices vertically through the target and detecting the presence or absence of Raman-active bands of C-H stretching bonds at 2800 to 3000 cm–1. This application is being extended to image the distribution of the hydrogen isotopes inside the fuel layer of the polystyrene shell—which is a shell of frozen deuterium and tritium. These data will provide greater resolution and sensitivity than the technique, tunable infrared diode laser spectroscopy, to address an important question that until now could not be diagnosed.
Korea Institute of Machinery & Materials (KIMM), Korea
For last decade, ultrafast lasers have become attractive tools for consumer electronics manufacturing such as mobile display, flexible electronics, and electric vehicles by providing breakthrough to overcome existing huddles in current production technology. In Korea, which is one of the most fast-varying countries in such fields, ultrafast laser processes have been aggressively adopted in OLED display pixel repair, glass and flexible film cutting, electrode patterning, and other critical processes by manufacturers. The department of laser and electron beam application at Korea institute of machinery and materials (KIMM) and our industrial partners have tried to bring the cutting-edge ultrafast laser technology to production sites.
This presentation introduces our recently demonstrated approaches in developing novel processes and relevant optical systems maximizing the benefit of ultrafast lasers. Firstly, tailoring of material properties by ultrafast lasers to enhance the device efficiency of organic electronics is presented. Laser induced photo-expansion and molecular reorientation is investigated as a new pathway to increase the quantum efficiency of OPVs. The surface engineering of the organic devices to enhance the crystallinity of organic semiconducting thin film will also be presented as another example of the localized tailoring of material properties. Secondly, the ultrafast laser systems for precision micromachining of the OLED display pixel (pixel repair) and electrode patterning of composite flexible film for OLED lighting are presented.