A5020626679- Laser Material Processing Techniques
- Advanced Surface Polishing Techniques
- Nonlinear Optical Materials Studies
- Surface Roughness and Optical Measurements
- Ocular and Laser Science Research
- Cultural Heritage Materials Analysis
- Additive Manufacturing Materials and Processes
- Laser and Thermal Forming Techniques
- Glass properties and applications
- Welding Techniques and Residual Stresses
- Characterization and Applications of Magnetic Nanoparticles
- Vascular Malformations and Hemangiomas
- Additive Manufacturing and 3D Printing Technologies
- Laser-induced spectroscopy and plasma
- Structural Analysis of Composite Materials
- Analytical Chemistry and Sensors
- Ear and Head Tumors
- Salivary Gland Tumors Diagnosis and Treatment
- Optical Coatings and Gratings
Fraunhofer Institute for Laser Technology
2014-2021
Fraunhofer Society
2015
Mechanical polishing of glass is a time consuming process especially for lenses deviating from spherical surface such as aspheres. With laser polishing, the processing can be significantly reduced and wear hard tooling avoided. Using radiation thin layer heated up just below evaporation temperature due to interaction material radiation. increasing temperature, viscosity in leads reduction roughness tension. Hence, contactless method realized nearly without any loss or need agent. In this...
Recent results of processing fused silica using a high-power Q-switched CO2 laser source with maximum output power 200 W are presented. Compared to the continuous wave radiation, main advantage pulsed radiation is influence light-matter interaction high peak at small average power. An application for approach presented in this paper flexible manufacturing and form correction optics. This laser-based process nearly independent surface geometry can even be enhanced by polishing expanded other...
This study presents the development of post-processing steps for microfluidics fabricated with selective laser etching (SLE) in fused silica. In a first step, SLE surface—even inner walls microfluidic channels—can be smoothed by polishing. addition, two-photon polymerization (2PP) can used to manufacture polymer microstructures and microcomponents inside channels. The reduction surface roughness polishing is remelting process. While heating glass above softening temperature, radiation...
With laser polishing, the roughness of ground glass surfaces can be significantly reduced. process speeds up to 1 cm 2 /s independent processed surface shape, resulting is already sufficient for illumination optics. To further reduce roughness, polishing itself will optimized and moreover combined with a subsequent based form correction. Within this paper, results as well correction combination two processes are presented discussed.
The context of future laser applications in modern manufacturing can be summarized by Digital Photonic Production (DPP). "From Bits to Photons Atoms" describes the vision DPP: Designing a component or product computer and creating it directly additive subtractive photon based processes production-systems.
• Recent advances in laser techniques for the treatment of vascular lesions have attempted to overcome disadvantages argon therapy. The trend toward a more selective these lesions, with preservation as much normal tissue possible, has been set. Minimal methods, yellow-dye lasers, and hematoporphyrin derivative photodynamic therapy extend abilities surgeon treat port-wine stains other safely. (<i>Arch Otolaryngol</i>1985;111:437-440)
Laser polishing of optical components offers a flexible approach to reduce the roughness regardless surface shape. For this reason, laser is especially suited for aspherical and freeform surfaces which can be polished with up 1 cm2/s fused silica. After measuring surface, subsequent form correction added high precision ablation step. In paper, both processes as well their combination are described results processing silica BK7 presented.
With CO<sub>2</sub>-laser radiation glass material can be melted and ablated. These processes are used to reduce the surface roughness of optics by melting (laser polishing) as well form errors ablation (high precision laser ablation). The manufacturing time in particular for polishing correction nonspherical reduced significantly. Current results high presented. polishing, fused silica, borosilicate (BK7) flint (S-TIH6) But, achieved waviness is not yet sufficient imaging optics. Hence,...
The fabrication of atomically smooth metal films on supporting oxides is a quite demanding task, since most physical vapor deposition methods used metals do not work properly oxide substrates. Here, we report an alternative procedure, based performing laser polishing fused silica substrate before depositing the metallic thin film. This reduces RMS surface roughness by ca. 33%, and increases maximum grain size film from 200 nm to 1200 nm. method has been applied parabolic lens, which coated...
With laser radiation, glass material can be in-volume structured, melted and ablated. These processes are used to form the geometry of optics as well polish surface increase geometric flexibility.