Design of optical elements for imaging the Earth's plasmasphere

Li-hui Wang; Xiao-kun Wang; Bo Chen

doi:10.1117/12.791213

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12 March 2008 Design of optical elements for imaging the Earth's plasmasphere

Li-hui Wang, Xiao-kun Wang, Bo Chen

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Proceedings Volume 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing; 662423 (2008) https://doi.org/10.1117/12.791213
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

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 UO_X (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.

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Li-hui Wang, Xiao-kun Wang, and Bo Chen "Design of optical elements for imaging the Earth's plasmasphere", Proc. SPIE 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing, 662423 (12 March 2008); https://doi.org/10.1117/12.791213

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