Coating free-form surfaces on large optical components
Light plays an important role in more and more economic sectors and markets – including in data transmission, communication, energy generation, laser processing, and classical optics. Accordingly, the demands placed on high-performance optical products and systems are increasing rapidly. Components and integrated optical systems are becoming increasingly complex.
Only recently, a team of researchers from science and industry was awarded the “Forschung im Verbund” joint industry and science prize for the latest developments in free-form optical systems. Employment of increasingly complex surfaces in optics means the complexity of the coatings also increases.
Applications using complexly shaped surfaces that enable the viewer to see content or objects from different perspectives, or to achieve a desired optical effect with varying incident angles of light, require highly complex optical layer systems.
The scientists at Fraunhofer FEP have now succeeded in developing new processes and coating technologies that can be used for complex surfaces of large optical components. Specifically, this involves fabrication of lateral gradient layer systems.
The objective of this research is to manufacture optical layer systems adapted to applications characterised by variable angles of incidence, such as waveguides in holography, head-up displays, laser illumination, and laser processing systems. One focus has also been adapting the coating technology to larger surfaces, as a trend towards larger substrates with curved surfaces has become apparent.
The results make it feasible to better adapt to specific customer requirements by locally adjusting the optical function of optical multilayer systems. This applies in particular to coatings on large substrates or 3D substrates, where the incident angle of the light locally varies in the application. The optical function now can be adapted to the given incident angle of light.
Dr. Daniel Glöß, head of department Dynamic Coating explains: “The requirements for process control are very high. We basically have to adjust the coating thickness locally, which can be done either by accelerating the substrate movement during deposition or by varying the coating rate as a function of the substrate location. In both cases, we need very precise substrate movement.
With the PreSensLine, we have a coating system with the means for precision movement. The system control has now been adapted so that we can manufacture such coatings and offer them on a customer-specific basis.”
The complex requirements on the coating system were particularly challenging. As a result, through the joint research project “TopBePro” together with with AIS Automation Dresden GmbH, LSA GmbH and dresden elektronik ingenieurtechnik GmbH, Fraunhofer FEP scientists are now able to exert very precise temporal control over the different components (precision drive, coating sources, and power supply). Additional interfaces were implemented in EtherCAT and have achieved time resolution of the communication between components of <1ms.
Further development work is planned on the simulation in order to achieve the appropriate coating processes for the corresponding coating thickness profiles. In addition, the scientists are also looking to the future and intend to coat 3D substrates, such as larger mirrors and lenses, in addition to the existing planar coatings. The hardware requirements for this are met by the PreSensLine system at the Institute.
The scientists are open to discussing new specifications from interested partners for joint development of new applications. For detailed and personal discussions, colleagues from Fraunhofer FEP will be available during the 2nd OptecNet Annual Conference 2018 in Berlin, June 20-21, 2018.
2nd OptecNet Annual Conference
20–21 June 2018
Ihnestraße 16 – 20
14195 Berlin, Germany
Staff from Fraunhofer FEP will be present at the exhibition booth.
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP
Winterbergstraße 28 | 01277 Dresden, Germany | www.fep.fraunhofer.de
Head of Marketing: Ines Schedwill | Phone +49 351 8823-238 | firstname.lastname@example.org
Head of Corporate Communications: Annett Arnold, M.Sc. | Phone +49 351 2586-333 | email@example.com
Alle Nachrichten aus der Kategorie: Process Engineering
This special field revolves around processes for modifying material properties (milling, cooling), composition (filtration, distillation) and type (oxidation, hydration).
Valuable information is available on a broad range of technologies including material separation, laser processes, measuring techniques and robot engineering in addition to testing methods and coating and materials analysis processes.
A rich source of nutrients under the Earth’s ice sheets
Data from Greenland and Antarctica show: under ice trace elements are mobilised at higher rates than previously assumed. Trace elements such as iron, manganese and zinc are an integral part…
Life cycle of moon jellyfish depends on the microbiome
Research team at Kiel University uses Aurelia aurita as an example to demonstrate the relationship between microbial colonization and reproduction in marine cnidarians The body tissue of all multicellular living…
Fraunhofer IWM closes gaps in the mechanics of materials digital value chain
The greatest potential of digitalization in companies in which materials play a prominent role lies in the cross-process linking of materials data. This promises to shorten component development times, faster…