25 January 2018 Stray-light analyses of the multielement telescope for imaging and spectroscopy coronagraph on Solar Orbiter
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Abstract
The modeling of the scattering phenomena for the multielement telescope for imaging and spectroscopy (METIS) coronagraph on board the European Space Agency Solar Orbiter is reported. METIS is an inverted occultation coronagraph including two optical paths: the broadband imaging of the full corona in linearly polarized visible-light (580 to 640 nm) and the narrow-band imaging of the full corona in the ultraviolet Lyman-α (121.6 nm). METIS will have the unique opportunity of observing the solar outer atmosphere as close to the Sun as 0.28 AU and from up to 35 deg out-of-ecliptic. The stray-light simulations performed on the UV and VL channels of the METIS analyzing the contributors of surface microroughness, particulate contamination, cosmetic defects, and diffraction are reported. The results obtained with the nonsequential modality of Zemax OpticStudio are compared with two different approaches: the Monte Carlo ray trace with Advanced Systems Analysis Program (ASAP®) and a semianalytical model. The results obtained with the three independently developed approaches are in considerable agreement and show compliance to the requirement of stray-light level for both the UV and VL channels.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Paolo Sandri, Silvano Fineschi, Marco Romoli, Matteo Taccola, Federico Landini, Vania Da Deppo, Giampiero Naletto, Danilo Morea, Denis P. Naughton, Ester Antonucci, "Stray-light analyses of the multielement telescope for imaging and spectroscopy coronagraph on Solar Orbiter," Optical Engineering 57(1), 015108 (25 January 2018). https://doi.org/10.1117/1.OE.57.1.015108 . Submission: Received: 26 July 2016; Accepted: 10 October 2017
Received: 26 July 2016; Accepted: 10 October 2017; Published: 25 January 2018
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