Near-infrared HeI 1083nm Stokes polarimeter based on liquid crystal variable retarders

Zhiyong Zhang; Yuanyong Deng; Dongguang Wong; Yingzi Sun; Wenda Cao

doi:10.1117/12.615661

18 August 2005 Near-infrared HeI 1083nm Stokes polarimeter based on liquid crystal variable retarders

Zhiyong Zhang, Yuanyong Deng, Dongguang Wong, Yingzi Sun, Wenda Cao

Proceedings Volume 5901, Solar Physics and Space Weather Instrumentation; 59011F (2005) https://doi.org/10.1117/12.615661
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

Zhiyong Zhang, Yuanyong Deng, Dongguang Wong, Yingzi Sun, and Wenda Cao "Near-infrared HeI 1083nm Stokes polarimeter based on liquid crystal variable retarders", Proc. SPIE 5901, Solar Physics and Space Weather Instrumentation, 59011F (18 August 2005); https://doi.org/10.1117/12.615661

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