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Proceedings Paper

Coatings with high 102.6-to-121.6 nm reflectance ratio
Author(s): Luis Rodriguez-de Marcos; Juan I. Larruquert; José A. Méndez ; J. A. Aznárez; Manuela Vidal-Dasilva; Sergio García-Cortés
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Paper Abstract

Observations in the far ultraviolet (FUV) at wavelengths below ~125 nm, which include the H Lyman series and the spectral lines of many other important species, are expected to unveil fundamental information for solar physics and astrophysics. Among these, observations of the solar corona at 102.6 nm H Lyman β are of high interest, but they may be masked by the strong H Lyman α at 121.6 nm. This goal has been addressed here through the development of novel multilayer coatings with high reflectance at 102.6 nm and at the same time a low reflectance at 121.6 nm; the latter wavelength is mostly absorbed. An efficient reflection/rejection coating is not straightforward because of the lack of high-transmission materials in the short FUV. We have designed and prepared novel multilayers with combinations of the following materials: Al, LiF, SiC and C. Various combinations were found to display a high reflectance ratio at 102.6/121.6 nm when fresh. Some of them resulted in an undesired reflectance increase at 121.6 nm for the samples aged for a few weeks. The most promising multilayers are based on Al/LiF/SiC/LiF (starting with the innermost layer), which resulted in a good performance and a small evolution after months of storage in a desiccator. At the same time, these multilayers may the most efficient reflective narrowband coatings that have been developed with a peak wavelength in the ~100-130 nm.

Paper Details

Date Published: 10 October 2012
PDF: 7 pages
Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84433P (10 October 2012);
Show Author Affiliations
Luis Rodriguez-de Marcos, Instituto de Óptica-Consejo Superior de Investigaciones Científicas (Spain)
Juan I. Larruquert, Instituto de Óptica-Consejo Superior de Investigaciones Científicas (Spain)
José A. Méndez , Instituto de Óptica-Consejo Superior de Investigaciones Científicas (Spain)
J. A. Aznárez, Instituto de Óptica-Consejo Superior de Investigaciones Científicas (Spain)
Manuela Vidal-Dasilva, Instituto de Óptica-Consejo Superior de Investigaciones Científicas (Spain)
Sergio García-Cortés, Consejo Superior de Investigaciones Científicas (Spain)


Published in SPIE Proceedings Vol. 8443:
Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Stephen S. Murray; Jan-Willem A. den Herder, Editor(s)

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