Multilayer coatings for METIS instrument

A. J. Corso; P. Zuppella; G. Monaco; M. Suman; P. Nicolosi; D. L. Windt; M. G. Pelizzo

doi:10.1117/12.2552596

5 September 2019 Multilayer coatings for METIS instrument

A. J. Corso, P. Zuppella, G. Monaco, M. Suman, P. Nicolosi, D. L. Windt, M. G. Pelizzo

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Proceedings Volume 10565, International Conference on Space Optics — ICSO 2010; 105655G (2019) https://doi.org/10.1117/12.2552596
Event: International Conference on Space Optics—ICSO 2010, 2010, Rhodes Island, Greece

Abstract

The Multi Element Telescope for Imaging and Spectroscopy (METIS) is a coronagraph onboard of Solar Orbiter. It will perform simultaneous observations at HeII Lyman-α line, HI Lyman-α line and in visible. To achieve such capability, instrument mirrors need to be coated by multilayer (ML) structures with high efficiency at all three spectral ranges. Coatings with higher performances with respect standard Mo/Si are desirable. An instrument prototype of METIS has just flown onboard of a NASA sounding rocket: in this case, optics were coated with Mg/SiC MLs. Better performances have been obtained in terms of reflectivity, but long term stability of this coating is an open problem. Moreover the harsh conditions of the environment met during the Solar Orbiter mission given by plasma particles and high temperature could affect the lifetime of the optical components on the long term. We present the design and reflectivity tests of multilayer structures in which performances improvement is obtained by the use of novel capping layers. All multilayers are tuned at 30.4nm line but the design also maximize the performances at 121.6nm and 500 – 650 nm visible range. Analysis of Solar Orbiter environment have been carried on in order to point out the main damaging sources for the nanostructures. Computer simulations with a devoted software have been performed to preliminary evaluation of the possible instabilities in multilayers. Experimental tests for investigating the effects of the thermal heating and particles bombardments in the reflectivity performances have been planned.

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A. J. Corso, P. Zuppella, G. Monaco, M. Suman, P. Nicolosi, D. L. Windt, and M. G. Pelizzo "Multilayer coatings for METIS instrument", Proc. SPIE 10565, International Conference on Space Optics — ICSO 2010, 105655G (5 September 2019); https://doi.org/10.1117/12.2552596

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