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Tunable liquid-crystal filter for solar imaging at the He i 1083-nm line

G. A. Kopp, M. J. Derks, D. F. Elmore, D. M. Hassler, J. C. Woods, J. L. Streete, and J. G. Blankner

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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.

© 1997 Optical Society of America

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