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Proceedings Paper

Multilayer mirrors for FERMIatELETTRA beam transport system
Author(s): A. J. Corso; P. Zuppella; P. Nicolosi; D. Cocco; M. G. Pelizzo
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Paper Abstract

Experiments performed in a Free Electron Laser (FEL) facility can require a selection of higher harmonics; a typical example is the pump and probe experiments in which the system under test is pumped with a fundamental wavelength and probed with its third harmonic. The wavelengths selection performed by a monochromator can affect beam properties such as wavefront deformation or time elongation and its usage in the beam manipulation should be avoided. Nevertheless, for a limited number of wavelengths, the selection can be performed using periodic multilayer coatings (MLs) with the reflectivity peak tuned at the desired harmonic: this technique is already foreseen at the new FERMI@Elettra FEL facility for selecting 20nm, 16nm, 13.5nm and 6.66nm harmonics. In order to improve the fundamental rejection, the MLs have been overcoated by different capping-layers; in particular at shortest wavelength higher rejection ratio have been obtained by the use of a third absorbent material in the capping layer. However, this same approach has not showed considerable improvements at the longest wavelengths, where interferential aperiodic capping-layers designed using a method based on the control of standing wave distribution are to be preferred.

Paper Details

Date Published: 21 May 2011
PDF: 6 pages
Proc. SPIE 8078, Advances in X-ray Free-Electron Lasers: Radiation Schemes, X-ray Optics, and Instrumentation, 80780F (21 May 2011); doi: 10.1117/12.886870
Show Author Affiliations
A. J. Corso, Lab. for Ultraviolet and X-ray Optical Research, CNR, Institute for Photonics and Nanotechnologies (Italy)
Univ. degli Studi di Padova (Italy)
P. Zuppella, Lab. for Ultraviolet and X-ray Optical Research, CNR, Institute for Photonics and Nanotechnologies (Italy)
Univ. degli Studi di Padova (Italy)
P. Nicolosi, Lab. for Ultraviolet and X-ray Optical Research, CNR, Institute for Photonics and Nanotechnologies (Italy)
Univ. degli Studi di Padova (Italy)
D. Cocco, Sincrotrone Trieste S.C.p.A. (Italy)
M. G. Pelizzo, Lab. for Ultraviolet and X-ray Optical Research, CNR, Institute for Photonics and Nanotechnologies (Italy)
Univ. degli Studi di Padova (Italy)


Published in SPIE Proceedings Vol. 8078:
Advances in X-ray Free-Electron Lasers: Radiation Schemes, X-ray Optics, and Instrumentation
Thomas Tschentscher; Daniele Cocco, Editor(s)

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