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Polarizers tuned at key far-UV spectral lines for space instrumentation
Author(s): Juan I. Larruquert; A. Marco Malvezzi; Luis Rodríguez-de Marcos; Angelo Giglia; Nuria Gutiérrez-Luna; Lucía Espinosa-Yáñez; Carlos Honrado-Benítez; José A. Aznárez; Giuseppe Massone; Gerardo Capobianco; Silvano Fineschi; Stefano Nannarone
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Paper Abstract

Polarimetry is a valuable technique to help us understand the role played by the magnetic field of the coronal plasma in the energy transfer processes from the inner parts of the Sun to the outer space. Polarimetry in the far ultraviolet (FUV: 100-200 nm), which must be performed from space due to absorption in terrestrial atmosphere, supplies fundamental data of processes that are governed by the Doppler and Hanle effects on resonantly scattered line-emission. To observe these processes there are various key spectral lines in the FUV, from which H I Lyman α (121.6 nm) is the strongest one. Hence some solar physics missions that have been proposed or are under development plan to perform polarimetry at 121.6 nm, like the suborbital missions CLASP I (2015) and CLASP II (2018), and the proposed solar missions SolmeX and COMPASS and stellar mission Arago. Therefore, the development of efficient FUV linear polarizers may benefit these and other possible future missions. C IV (155 nm) and Mg II (280 nm) are other spectral lines relevant for studies of solar and stellar magnetized atmospheres.

High performance polarizers can be obtained with optimized coatings. Interference coatings can tune polarizers at the spectral line(s) of interest for solar and stellar physics. Polarizing beamsplitters consist in polarizers that separate one polarization component by reflection and the other by transmission, which enables observing the two polarization components simultaneously with a single polarizer. They involve the benefit of a higher efficiency in collection of polarization data due to the use of a single polarizer for the two polarization components and they may also facilitate a simplified design for a space polarimeter. We present results on polarizing beamsplitters tuned either at 121.6 nm or at the pair of 155 and 280 nm spectral lines.

Paper Details

Date Published: 31 May 2017
PDF: 8 pages
Proc. SPIE 10235, EUV and X-ray Optics: Synergy between Laboratory and Space V, 102350K (31 May 2017); doi: 10.1117/12.2265777
Show Author Affiliations
Juan I. Larruquert, Consejo Superior de Investigaciones Científicas (Spain)
A. Marco Malvezzi, Istituto Officina dei Materiali - CNR (Italy)
INAF - Osservatorio Astrofisico di Torino (Italy)
Luis Rodríguez-de Marcos, Consejo Superior de Investigaciones Científicas (Spain)
Angelo Giglia, Istituto Officina dei Materiali - CNR (Italy)
Nuria Gutiérrez-Luna, Consejo Superior de Investigaciones Científicas (Spain)
Lucía Espinosa-Yáñez, Consejo Superior de Investigaciones Científicas (Spain)
Carlos Honrado-Benítez, Consejo Superior de Investigaciones Científicas (Spain)
José A. Aznárez, Consejo Superior de Investigaciones Científicas (Spain)
Giuseppe Massone, INAF - Osservatorio Astrofisico di Torino (Italy)
Gerardo Capobianco, INAF - Osservatorio Astrofisico di Torino (Italy)
Silvano Fineschi, INAF - Osservatorio Astrofisico di Torino (Italy)
Stefano Nannarone, Istituto Officina dei Materiali - CNR (Italy)


Published in SPIE Proceedings Vol. 10235:
EUV and X-ray Optics: Synergy between Laboratory and Space V
René Hudec; Ladislav Pina, Editor(s)

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