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Enhancement of extreme ultraviolet emission from laser irradiated targets by surface nanostructures

  • E. F. Barte (a1) (a2), R. Lokasani (a1) (a2), J. Proska (a1), L. Maresova (a1), D. Kos (a1) (a2), O. Maguire (a2), G. Joseph (a2), J. Sheil (a2), F. O'Reilly (a2), T. McCormack (a2), E. Sokell (a2), G. O'Sullivan (a2), J. Limpouch (a1) and P. Dunne (a2)...

Abstract

The effects of shape and thickness of a tin surface layer and of the energy of a 170 ps neodymium:yttrium-aluminum-garnet laser pulse on the conversion efficiency (CE) into extreme ultraviolet emission in the 13.5 nm region is investigated. Whereas a CE of up to 1.16% into the 2% reflection band of multilayer Mo/Si optics was measured for a bulk Sn target at a laser energy of 25 mJ, significant CE enhancement up to 1.49% is demonstrated for a 200-nm-thick Sn layer on a microstructured porous alumina substrate.

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Corresponding author

Address correspondence and reprint requests to: Ellie Floyd Barte and Prof. Jiří Limpouch, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, V Holesovickach 2, 180 00 Praha 8, Czech Republic. E-mail: elliefloydbarte@gmail.com

References

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