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Optical Engineering

Design and fabrication of multilayer reflective filters for a Ritchey-Chretien Lyman-alpha telescope
Author(s): Jungho Park; Muamer Zukic; Michele Wilson McColgan; Charles E. Keffer; Douglas G. Torr; Richard B. Hoover
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Paper Abstract

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.

Paper Details

Date Published: 1 May 1996
PDF: 4 pages
Opt. Eng. 35(5) doi: 10.1117/1.600684
Published in: Optical Engineering Volume 35, Issue 5
Show Author Affiliations
Jungho Park
Muamer Zukic, Univ. of Alabama in Huntsville (United States)
Michele Wilson McColgan, Advanced Optical Systems (United States)
Charles E. Keffer, Technology Development Corporation (United States)
Douglas G. Torr, Univ. of Alabama in Huntsville (United States)
Richard B. Hoover, NASA Marshall Space Flight Ctr. (United States)

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