TOM 1 - Silicon Photonics and Guided-Wave Optics
TOM 2 - Computational, Adaptive and Freeform Optics
TOM 3 - Optical System Design, Tolerancing and Manufacturing
TOM 4 - Bio-Medical Optics
TOM 5 - Resonant Nanophotonics
TOM 6 - Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and applications
TOM 7 - Thermal radiation and energy management
TOM 8 - Non-linear and Quantum Optics
TOM 9 - Opto-electronic Nanotechnologies and Complex Systems
TOM 10 - Frontiers in Optical Metrology
TOM 11 - Tapered optical fibers, from fundamental to applications
TOM 12 - Optofluidics
TOM 13 - Advances and Applications of Optics and Photonics
EU Project Session
Early Stage Researcher Session
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Please note that all times are shown in the time zone of the conference. The current conference time is: 3rd Oct 2022, 03:46:48pm WEST
TOM3 S03: Optical System Design, Tolerancing and Manufacturing
4:30pm - 6:00pm
Session Chair: Sven Schröder, Fraunhofer IOF, Germany
Ground floor, 99 seats
4:30pm - 5:00pm Invited ID: 303 / TOM3 S03: 1 TOM 3 Optical System Design, Tolerancing and Manufacturing
International and digital subsurface-damage-testing technologies laboratory
Jens Bliedtner1, Samson Frank1, Oliver Faehnle2, Heidi Cattaneo2
1Ernst-Abbe-University of Applied Sciences Jena, Germany; 2OST –Eastern Switzerland University of Applied Sciences Buchs, Switzerland
With the establishment of a versatile infrastructure for subsurface damages, a new interational laboratory has been established. For this purpose, researchers from the fields of optical metrology, optics technology, ophthalmology and computer science joined forces. A central research question and object of
object in the OpenLab are microcracks in optics
production, so-called subsurface damage. With the
ultra-high resolution and highly sensitive optical coherence
coherence tomography, a measuring principle based on white light principle based on white light interferometry, it will be possible to in glasses and ceramics with a resolution of 1 μm.
The laboratory is open to researchers and users to work together on topics related to SSD or to have measurement tasks carried out directly. The article presents the structure, the possibilities of cooperation and the goals of the open lab.
5:00pm - 5:15pm ID: 309 / TOM3 S03: 2 TOM 3 Optical System Design, Tolerancing and Manufacturing
Improved production of large and multi-directional homogeneous optical glass: SCHOTT N-BK7® for challenging applications
In many applications, the spatial refractive index variation – called homogeneity – within a measurement aperture either in one or two directions is important. Typical application examples are prisms in ultra-precision metrology with stability in multiple directions. Large lenses are used in artificial laser guide star systems for atmospheric correction in large telescopes. The challenge of enabling highest refractive index homogeneities requires tight control of all production steps from melting to hot forming and fine annealing. Large optical formats can be produced as singular castings in moulds up to 1.2 m in diameter and 250 mm thickness. Smaller formats are available as blocks produced in dimensions of approx. 250 x 250 x 180 mm3. A more economic and ecologic way is the production of continuous strips of glass up to approx. 500 mm width and 120 mm thickness. Recently SCHOTT has improved the homogeneity of these continuously produced jumbo strips significantly. Now homogeneity of up to H4 quality (2 ppm index maximum variation) can be provided on apertures up to approx. 900 mm x 500 mm. This paper gives an insight overview on the latest results and current state of this topic at the optical glass manufacturer SCHOTT.
5:15pm - 5:45pm Invited ID: 172 / TOM3 S03: 3 TOM 3 Optical System Design, Tolerancing and Manufacturing
Balancing your complexity budget
Sebastian Riese, Peter Zimmermann
LAYERTEC GmbH, Germany
The requirements for high-performance optics are continously increasing. This concerns optical requirements, e.g. for ultrafast optics, low-loss mirrors or high-power applications, and geometrical requirements alike, e.g. satisfying demanding spatial constraints or using free-form surfaces to reduce the number of required optics. As a result, substrate geometries and coatings grow more and more complex, posing challenges with respect to precision optics manufacturing, deposition technology and metrology as well as cost effectiveness.
LAYERTEC has addressed these kinds of challenges for more than 30 years. Proper communication of the required specifications is essential. Most importantly, the main properties of the optics have to be identified and mechanical, optical and coating engineering balanced accordingly. This is true for industry clients as well as research institutes, for high-volume fabrication or prototyping. Possible issues and lessons learned are presented.
5:45pm - 6:00pm ID: 168 / TOM3 S03: 4 TOM 3 Optical System Design, Tolerancing and Manufacturing
Investigations on a novel process chain for manufacturing of freeform surfaces
Sebastian Henkel1, Christian Schulze1, Samson Frank1, Christoph Letsch1, Jens Bliedtner1, Thomas Arnold2, Heike Müller2, Edda Rädlein3
1Ernst-Abbe University of Applied Sciences Jena; 2Leibniz-Institut für Oberflächenmodifizierung e.V. (IOM); 3Technical University Ilmenau
Freeform optical surfaces have become increasingly important in recent years, as they can be used to construct optical assemblies with a reduced number of optical surfaces compared to systems without freeform surfaces, and thus optical systems can get more compact and lighter. However, the flexible and efficient production of precise optical freeform surfaces poses a major problem. This manifests itself in insufficient precision of the optics, long delivery times and high prices. It is shown, that ultrasonic grinding processes, combined with an ultra-fine grinding process and subsequent plasma jet polishing, are very well suited for the production of freeform optics and have a high technical and economic potential. Therefore, the aim is to validate an industrially suitable process chain based on this combination, in order to produce freeform optics of high accuracy (shape deviations <100 nm RMS) that can be manufactured in significantly fewer steps than before.