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Proceedings Paper

Design and fabrication of the near-ultraviolet birefringent Solc filter for the NASA IRIS solar physics mission
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Paper Abstract

The NASA Interface Region Imaging Spectrograph (IRIS) mission is a Small Explorer (SMEX) satellite mission designed to study plasma dynamics in the “interface region” between the Sun’s chromosphere and corona with high spatial, spectral, and temporal resolution. The primary instrument is a dual Czerny-Turner spectrograph fed by a 20-cm Cassegrain telescope measuring near- and far-ultraviolet (NUV, FUV) spectral lines in the ranges 133-141 nm and 278- 283 nm. To determine the position of the slit on the solar disk, a slit-jaw imaging system is used. The NUV slit-jaw imaging system produces high spatial resolution images at two positions in the Mg II 280 nm spectral line complex using a birefringent Solc filter with two wide-band interference pre-filters for spectral order selection. The Solc filter produces a 0.36 nm full-width at half-maximum (FWHM) filter profile with low sidelobes and a peak transmission of 15% at 279.6 nm. The filter consists of two “wire grid’’ polarizers surrounding 8 quartz waveplates configured in a modified Solc “fan” rotational pattern. The elements are optically coupled using DC200 silicon-based grease. The NUV Solc filter is sealed in a windowed cell to prevent silicon contamination of the FUV channel. The design of the sealed cell and assembly of the filter into the cell were among the most challenging optomechanical aspects of the IRIS spectrograph system.

Paper Details

Date Published: 11 October 2012
PDF: 7 pages
Proc. SPIE 8486, Current Developments in Lens Design and Optical Engineering XIII, 84860G (11 October 2012); doi: 10.1117/12.927849
Show Author Affiliations
Thomas Berger, Lockheed Martin (United States)
Jason Mudge, Lockheed Martin (United States)
Buck Holmes, Lockheed Martin (United States)
Paul Searcy, Meadowlark Optics, Inc. (United States)
Jean Pierre Wuelser, Lockheed Martin (United States)
James Lemen, Lockheed Martin (United States)
Alan Title, Lockheed Martin (United States)

Published in SPIE Proceedings Vol. 8486:
Current Developments in Lens Design and Optical Engineering XIII
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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