Paper published in a book (Scientific congresses and symposiums)
Design, manufacturing and prototype testing of the METIS ring apodizer
König, Lorenzo; Delacroix, Christian; Absil, Olivier et al.
2024In Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI
Editorial reviewed
 

Files


Full Text
Konig24_SPIE_Ring_Apodizer.pdf
Author postprint (4.01 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
ring apodizer; vortex coronagraph; microdots; extremely large telescope
Abstract :
[en] The Mid-Infrared ELT Imager and Spectrograph (METIS) is one of the three first-generation instruments of the Extremely Large Telescope (ELT). METIS will enable high-contrast imaging through different coronagraphic modes, one of which is implemented with a vortex coronagraph. However, the complex pupil of the ELT with its large central obscuration limits the performance of a classical vortex coronagraph. Using a grayscale ring apodizer in a pupil plane upstream of the vortex phase mask can correct for the effect of the central obscuration and partly restore the coronagraphic performance of the vortex for the ELT pupil. The coronagraphic performance of the ring-apodized vortex coronagraph relies on the precise control of transmission in the grayscale region, which can be implemented using a technology based on chromium microdots. Here, we present the ring apodizer for the METIS instrument exploiting the microdots technology. We first describe the design process of microdot patterns and perform simulations for both transmission and phase response of the microdots with various geometric parameters. We then describe the manufacturing of three prototypes featuring different design parameters, as well as their testing in terms of transmission and phase response. Finally, capitalizing on the lessons learned, we report on the current status of manufacturing and testing of the final ring apodizer for METIS.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
König, Lorenzo ;  Université de Liège - ULiège > Faculté des Sciences > Form. doct. sc. (sc. spatiales - paysage)
Delacroix, Christian  ;  Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Planetary & Stellar systems Imaging Laboratory
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Orban De Xivry, Gilles  ;  Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Language :
English
Title :
Design, manufacturing and prototype testing of the METIS ring apodizer
Publication date :
26 August 2024
Event name :
SPIE Astronomical Telescopes + Instrumentation 2024
Event date :
16-21 June 2024
Audience :
International
Main work title :
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI
Publisher :
SPIE
Pages :
131002P
Peer reviewed :
Editorial reviewed
European Projects :
H2020 - 819155 - EPIC - Earth-like Planet Imaging with Cognitive computing
Name of the research project :
EPIC
Funders :
ERC - European Research Council
European Union
Funding number :
819155
Available on ORBi :
since 13 November 2024

Statistics


Number of views
15 (5 by ULiège)
Number of downloads
14 (3 by ULiège)

Scopus citations®
 
0
Scopus citations®
without self-citations
0
OpenCitations
 
0
OpenAlex citations
 
0

Bibliography


Similar publications



Contact ORBi