16 - 21 June 2024
Yokohama, Japan
Conference 13093 > Paper 13093-145
Paper 13093-145

VUV bandpass reflective coatings for the SMILE-UVI instrument

17 June 2024 • 17:30 - 19:00 Japan Standard Time | Room G5, North - 1F

Abstract

The Ultraviolet Imager (UVI) onboard the ESA-CAS Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) joint mission is a CMOS-based ultraviolet camera developed for imaging Earth's northern auroral regions over the 160-180 nm UV waveband with a 10° × 10° field of view. At the core of the instrument, four thin film-coated mirrors guide light into its detector and ensure most of the signal filtering, crucial to achieve an out-of-band rejection ratio as low as possible to reject light from solar diffusion, dayglow and unwanted atomic lines. We developed an interferometric coating based on an MgF2/LaF3 multilayer stack deposited by ion-assisted electron-beam deposition. The reflectivity maximum is above 85% and the wavelength at which it occurs is adjustable within 1 nm, while the out-of-band reflectivity between 120 and 155 nm and between 200 nm and 1100 nm is kept below 6% on average never exceeding 8 %. The coating has been space qualified and shows stable performances in conditions representative of the instrument operation environment (thermal cycling under vacuum, radiations, UV exposure…).

Presenter

Jérémy Brisbois
Ctr. Spatial de Liège (Belgium)
Jérémy Brisbois got his PhD in Physics at the University of Liège in 2017, for his research on magneto-optical imaging applied to superconducting and magnetic samples. Since he started working at the Centre Spatial de Liège (CSL) in 2018, he has been involved in several projects related to surface engineering and optical characterization, in the UV to IR range.
Presenter/Author
Jérémy Brisbois
Ctr. Spatial de Liège (Belgium)
Author
Frédéric Rabecki
Ctr. Spatial de Liège (Belgium)
Author
Ctr. Spatial de Liège (Belgium)
Author
Ctr. Spatial de Liège (Belgium)
Author
Pascal Blain
Ctr. Spatial de Liège (Belgium)
Author
Alexandra Mazzoli
Ctr. Spatial de Liège (Belgium)
Author
Technische Univ. Delft (Netherlands)
Author
Ctr. Spatial de Liège (Belgium)
Author
Ctr. Spatial de Liège (Belgium)
Author
Karl Fleury-Frenette
Ctr. Spatial de Liège (Belgium)