Conference Agenda

TOM3 S07: Optical System Design, Tolerancing and Manufacturing
Thursday, 15/Sept/2022:
8:30am - 10:00am

Session Chair: Sven Schröder, Fraunhofer IOF, Germany
Location: B032

Ground floor, 99 seats

8:30am - 9:00am
ID: 318 / TOM3 S07: 1
TOM 3 Optical System Design, Tolerancing and Manufacturing

Large metal mirrors for atmospheric telescopes

Guoyu Yu1, David Walker1,2,3, Hongyu Li1, Abdullah Shahjalal1, Trevor Walker4

1University of Huddersfield, United Kingdom; 2Zeeko Ltd, United Kingdom; 3University College London, United Kingdom; 4Thin Metal Films Ltd, United Kingdom

We are developing technologies in processing and metrology to fabricate a 1.4-meter aperture, aspherical surface Aluminium prototype mirror for Cherenkov Telescope Array. The aim is to fast process these large aperture mirrors at low cost. The technical development will ensure the high specifications on the surface quality. Different metrology methods including Swinging Arm Profilometry (SAP) and phase measuring deflectometry (PMD) are being developed. Recent results have shown very promising progress on these developments. We have excellent record in transferring our research results into industry. These cutting-edge technologies will be transferred to our industry partner to explore further developments.

9:00am - 9:15am
ID: 312 / TOM3 S07: 2
TOM 3 Optical System Design, Tolerancing and Manufacturing

Dynamic optimization of optical design process by means of producibility modulations

Olga Resnik1, Oliver Faehnle2, Yosi Arazi1

1JoYa Team; 2OST – Ostschweizer Fachhochschule, Switzerland

While optical design translates the application parameters of optical systems such as MTF and image resolution into a set of well-defined technical drawings, their manufacturability can only be assessed retrospectively, e.g. with PanDao. In this Paper, PanDao is being dynamically applied during the optical design process allowing to take producinbility aspects into account from the beginning on.

9:15am - 9:30am
ID: 239 / TOM3 S07: 3
TOM 3 Optical System Design, Tolerancing and Manufacturing

Optical methods for measuring the feature size of optical diffraction gratings with nano-meter accuracy and implementation of suitable feedback control loops

Thomas Flügel-Paul1, Martin Heusinger1, Kristin Gerold1, Adriana Szeghalmi1, Uwe Zeitner1,2

1Fraunhofer Institute For Applied Optics And Precision Engineering, Germany; 2Institute of Applied Physics, Friedrich-Schiller-Universität Jena, Germany

Surface relief diffraction gratings offer a high flexibility in their design and thus allow to synchronize their optical performance with the specific requirements of the underlying application. However, the accuracy and the specific control of the manufacturing processes are of vital importance. In this contribution, we present optical methods relying on white-light ellipsometry and how they can be exploited for the measurement of the critical dimensions of manufactured surface relief grating structures. We will furthermore present suitable processes (relying on atomic layer deposition) and how they are used in a feedback loop to control the grating’s feature sizes on the nanometer scale.

9:30am - 9:45am
ID: 331 / TOM3 S07: 4
TOM 3 Optical System Design, Tolerancing and Manufacturing

Advances in Robot Pre-Polishing platforms and mid-spatial removal technologies

Richard Freeman, Christopher King, Oliver Pakenham-Walsh, Kathryn Copson

Zeeko Ltd, United Kingdom

This paper documents the development of a Freeform Pre-Polisher that integrates Zeeko's well established Bonnet Polishing Technology, to a regular 6-Axis industrial Robot.

This platform is then used to test a novel new mid-spatial removal tool on different materials and the results of which are reported and discussed.