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Design and fabrication of multilayer reflective filters for a Ritchey‐Chretien Lyman‐α telescope

1996; SPIE; Volume: 35; Issue: 5 Linguagem: Inglês

10.1117/1.600684

1560-2303

Jung H. Park, Muamer Zukic, Michele M. Wilson, Charles E. Keffer, D. G. Torr, Richard B. Hoover,

Adaptive optics and wavefront sensing

We report the design and fabrication of multilayer reflective filters for the self-filtering cameras of a Ritchey-Chretien Lyman-a (Ly-a) telescope that uses reflecting multilayer mirrors, polarizers, and filters. The Ly-a telescope is designed to measure the linear polization of hydrogen Ly-a line (121.6 nm) emissions from the solar corona. A key element of the filter design includes the development of p multilayers optimized to provide maximum reflectance at 121.6 nm for the respective cameras without significant angular variation from 0 to 15-deg incident angles. We applied self-filtering concepts to design Ly-a telescope filters that are composed of two reflective mirrors. The calculated value of the net throughput is 28.38% with a 4-nm bandwidth at a center wavelength of 121.6 nm. The measured value is 27.35% with a less than 6-nm bandwidth at incidence angle 10 deg.