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Proceedings Paper

Near-infrared HeI 1083nm Stokes polarimeter based on liquid crystal variable retarders
Author(s): Zhiyong Zhang; Yuanyong Deng; Dongguang Wong; Yingzi Sun; Wenda Cao
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Paper Abstract

The spectral line of HeI 1083nm is important and potential to measure the magnetic field of the solar upper chromosphere. In this paper, we present a newly developed Stokes polarimeter for measuring the polarized signals at this wavelength. In this device, two Liquid Crystal Variable Retarders (LCVRs) were employed as electro-optical modulators and a Wollaston prism as analyzer and polarized beam splitter. Compared to the commonly used linear-polarized analyzer, the Wollaston prism analyzer has main advantage to minimize the seeing-induced contamination of earth's atmosphere, as it produces simultaneous images by the two perpendicular polarization states. A novel optical design which focuses the two beams on different detector areas is described. And the accurate calibration methods are introduced too.

Paper Details

Date Published: 18 August 2005
PDF: 12 pages
Proc. SPIE 5901, Solar Physics and Space Weather Instrumentation, 59011F (18 August 2005); doi: 10.1117/12.615661
Show Author Affiliations
Zhiyong Zhang, National Astronomical Observatories, CAS (China)
Yuanyong Deng, National Astronomical Observatories, CAS (China)
Dongguang Wong, National Astronomical Observatories (China)
Yingzi Sun, National Astronomical Observatories (China)
Wenda Cao, New Jersey Institute of Technology (United States)

Published in SPIE Proceedings Vol. 5901:
Solar Physics and Space Weather Instrumentation
Silvano Fineschi; Rodney A. Viereck, Editor(s)

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