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Proceedings Paper • Open Access

Development of linear variable filter and black coatings by PARMS technology for FLORIS HR focal plane array of FLEX mission
Author(s): Thomas Weber; Marc Lappschies; Stefan Jakobs; Marco Meini; Riccardo Gabrieli; Matteo Taccola

Paper Abstract

Beside homogeneous filter coatings a coating can also be applied with a linear gradient. Linear gradient or linear variable filters show a gradient of a band edge or central wavelength depending on the filter type in spectral direction and they are homogeneous in spatial direction. In this paper, we present a linear variable narrow band pass filter with full width half maximum of about 8 nm and a transmittance of more than 98% in the wavelength range of 670 nm to 780 nm. The target for the gradient is 3.3. nm/mm. Due to the need of transmittance filter and AR coating are manufactured by means of Plasma Enhanced Magnetron Sputtering (PARMS). Additionally, the linear variable filter for FLEX mission requires a black mask to separate between HR1 and HR2 channel. This mask is also applied by OBJ by means of the PARMS process and a Ti based layer stack. Here, a reflectance of <1.5% in the range of 400 nm to 800 nm can be demonstrated. The definition of black mask was done by means of photolithography.

Paper Details

Date Published: 12 July 2019
PDF: 9 pages
Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 1118044 (12 July 2019); doi: 10.1117/12.2536067
Show Author Affiliations
Thomas Weber, Optics Balzers Jena GmbH (Germany)
Marc Lappschies, Optics Balzers Jena GmbH (Germany)
Stefan Jakobs, Optics Balzers Jena GmbH (Germany)
Marco Meini, Leonardo S.p.A. (Italy)
Riccardo Gabrieli, Leonardo S.p.A. (Italy)
Matteo Taccola, ESA-ESTEC (Netherlands)

Published in SPIE Proceedings Vol. 11180:
International Conference on Space Optics — ICSO 2018
Zoran Sodnik; Nikos Karafolas; Bruno Cugny, Editor(s)

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