Tunable liquid-crystal filter for solar imaging at the He i 1083-nm line
- 1 January 1997
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 36 (1) , 291-296
- https://doi.org/10.1364/ao.36.000291
Abstract
A Lyot–Öhman filter for imaging near the solar He i 1083-nm line is described. Fast and continuous spectral tunability is provided by nematic liquid crystals. This solid-state filter has a free spectral range of 2.35 nm and a spectral resolution of 0.135 nm at the operating wavelength of 1083 nm. A wide-fielded design was used for both static and electro-optic retarder elements, facilitating use in fast imaging systems. A first-light He i image of the Sun is presented.Keywords
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