Design and performance of two-channel EUV multilayer mirrors with enhanced spectral selectivity |
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Authors: | Christophe Hecquet Franck Delmotte Marie-Fran?oise Ravet-Krill Sébastien de Rossi Arnaud Jérome Fran?oise Bridou Fran?oise Varnière Evgueni Meltchakov Frédéric Auchère Angelo Giglia Nicola Mahne Stefano Nanaronne |
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Institution: | (1) Laboratoire Charles Fabry, Institut d’Optique, CNRS, Univ. Paris-Sud, Campus Polytechnique, RD 128, 91127 Palaiseau Cedex, France;(2) Institut d’Astrophysique Spatiale, CNRS, Univ. Paris-Sud, bat. 121, 91405 Orsay Cedex, France;(3) Laboratorio TASC-INFM-CNR, S.S. 14, km 163.5 in Area Science Park, Trieste, 34012, Italy;(4) Dipartimento di Ingegneria dei Materiali e dell’Ambiente, Universita di Modena e Reggio Emilia, via Vignolese 905, 41100 Modena, Italy |
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Abstract: | In this paper, we present a study on two-channel multilayer mirrors which can operate at two wavelengths in Extreme Ultraviolet
(EUV) spectral range. We propose a new method to design two-channel EUV multilayer mirrors with enhanced spectral selectivity.
The mirror structure is a stack of two periodic multilayers separated by a buffer layer. We have defined the main parameters
which allow adjustment of the distance between different order Bragg’s peak and of wavelength positions of reflectivity minima.
Two mirrors have been designed and deposited for solar EUV telescope applications by using this method. The first mirror reflects
Fe IX–X line (17.1 nm) and Fe XVI (33.5 nm) lines with attenuation of the He II line (30.4 nm). The second mirror reflects
Fe IX–X and He II lines with attenuation of Fe XV (28.4 nm) and Fe XVI lines. Measurements with synchrotron radiation source
confirm that, in both cases, for these mirrors, we are able to adjust reflectivity maxima (Bragg peak position) and minima.
Such multilayers offer new possibilities for compact design of multi-wavelength EUV telescopes and/or for high spectral selectivity. |
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Keywords: | PACS" target="_blank">PACS 42 79 Bh 42 15 Eq 78 67 Pt 96 60 Tf 42 79 Ci |
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