Progress in Large Period Multilayer Coatings for High Harmonic and Solar Applications

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Multilayer coatings for normal incidence optics designed for the long wavelength region (25 nm < {lambda} < 50 nm) are particularly challenging due to the few number of layers that can be utilized in the reflection. Recently, Mg/SiC multilayers have been fabricated with normal incidence reflectivity in the vicinity of 40% for wavelengths near the He-II line at 30.4 nm. Motivated by this success we have investigated the use of a tri-band multilayer to increase the bandwidth while maintaining the reflectivity. The multilayers were deposited by conventional magnetron sputtering. Using Mg/SiC bilayers a reflectivity of 45% was achieved at 27 ... continued below

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Jones, Juanita; Aquila, Andrew; Salmassi, Farhad & Gullikson, Eric January 7, 2008.

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Multilayer coatings for normal incidence optics designed for the long wavelength region (25 nm < {lambda} < 50 nm) are particularly challenging due to the few number of layers that can be utilized in the reflection. Recently, Mg/SiC multilayers have been fabricated with normal incidence reflectivity in the vicinity of 40% for wavelengths near the He-II line at 30.4 nm. Motivated by this success we have investigated the use of a tri-band multilayer to increase the bandwidth while maintaining the reflectivity. The multilayers were deposited by conventional magnetron sputtering. Using Mg/SiC bilayers a reflectivity of 45% was achieved at 27 to 32 nm at an angle of 5 deg from normal. The Mg/Sc/SiC multilayer systems have also been investigated. It obtained a near normal incidence reflectivity of 35% while increasing the bandwidth by a factor of 2. These results are very encouraging for the possibility of more widespread applications of normal incidence optics in high harmonic applications.

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  • Physics of X-ray Multilayer Structures, Montana, Feb. 3-7, 2008

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  • Report No.: LBNL-847E-Ext-Abs
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 936524
  • Archival Resource Key: ark:/67531/metadc896741

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  • January 7, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 2, 2017, 5:34 p.m.

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Jones, Juanita; Aquila, Andrew; Salmassi, Farhad & Gullikson, Eric. Progress in Large Period Multilayer Coatings for High Harmonic and Solar Applications, article, January 7, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc896741/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.