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Proceedings Paper

Design of optical elements for imaging the Earth's plasmasphere
Author(s): Li-hui Wang; Xiao-kun Wang; Bo Chen
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Paper Abstract

Studying the distribution of He+ in Earth's plasmasphere by detecting its resonantly-scattered emission at 304Å will record the structure and dynamics of the cold plasma in Earth's plasmasphere on a global scale. EUV imaging systems usually utilizes near normal incidence optics including multilayer mirror and filter. In this paper, the space condition of the Earth's plasmasphere to confirm the expected performance of mirror and filter for this task were analyzed and some guidelines for the design of the optical elements were introduced. In order to achieve higher response at 304Å and reduce 584Å radiation for the optical system, a new multilayer coating of Mo/Si with UOX (x=2~3) was developed, and it is indicated that promising filter material is Al/C with a nickel mesh. In addition, we compute the reflectance of multilayer mirror based on optical constants and the transmission of the filter based on atomic scattering factor. The results show the multilayer mirror has high reflectance of 26.27% at 304 Å and low reflectance of 0.60% at 584Å. Finally, the conversion efficiency of mirror coupled with filter is 6.88% at 304Å and 0.01% at 584Å.

Paper Details

Date Published: 12 March 2008
PDF: 7 pages
Proc. SPIE 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing, 662423 (12 March 2008); doi: 10.1117/12.791213
Show Author Affiliations
Li-hui Wang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Graduate School of Chinese Academy of Sciences (China)
Xiao-kun Wang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Graduate School of Chinese Academy of Sciences (China)
Bo Chen, Changchun Institute of Optics, Fine Mechanics and Physics (China)


Published in SPIE Proceedings Vol. 6624:
International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing

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