1. Alternate Multilayer Gratings with Enhanced Diffraction Efficiency in the 500–5000 eV Energy Domain.
- Author
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Polack, François, Lagarde, Bruno, Idir, Mourad, Cloup, Audrey Liard, Jourdain, Erick, Roulliay, Marc, Delmotte, Franck, Gautier, Julien, and Ravet-Krill, Marie-Françoise
- Subjects
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OPTICS , *PHYSICS , *OPTICAL diffraction , *PHOTONS , *LIGHT - Abstract
An alternate multilayer (AML) grating is a 2 dimensional diffraction structure formed on an optical surface, having a 0.5 duty cycle in the in-plane and in the in-depth direction. It can be made by covering a shallow depth laminar grating with a multilayer stack. We show here that their 2D structure confer AML gratings a high angular and energetic selectivity and therefore enhanced diffraction properties, when used in grazing incidence. In the tender X-ray range (500eV – 5000 eV) they behave much like blazed gratings. Over 15% efficiency has been measured on a 1200 lines/mm Mo/Si AML grating in the 1.2 – 1.5 keV energy range. Computer simulations show that selected multilayer materials such as Cr/C should allow diffraction efficiency over 50% at photon energies over 3 keV. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2007
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