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Proceedings Paper

Design of compressors for FEL pulses using deformable gratings
Author(s): Stefano Bonora; Nicola Fabris; Fabio Frassetto; Ennio Giovine; Paolo Miotti; Martino Quintavalla; Luca Poletto
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Paper Abstract

We present the optical layout of soft X-rays compressors using reflective grating specifically designed to give both positive or negative group-delay dispersion (GDD). They are tailored for chirped-pulse-amplification experiments with FEL sources. The optical design originates from an existing compressor with plane gratings already realized and tested at FERMI, that has been demonstrated capable to introduce tunable negative GDD. Here, we discuss two novel designs for compressors using deformable gratings capable to give both negative and positive GDD. Two novel designs are discussed: 1) a design with two deformable gratings and an intermediate focus between the twos, that is demonstrated capable to introduce positive GDD; 2) a design with one deformable grating giving an intermediate focus, followed by a concave mirror and a plane grating, that is capable to give both positive and negative GDD depending on the distance between the second mirror and the second grating. Both the designs are tunable in wavelength and GDD, by acting on the deformable gratings, that are rotated to tune the wavelength and the GDD and deformed to introduce the radius required to keep the spectral focus. The deformable gratings have a laminar profile and are ruled on a thin silicon plane substrate. A piezoelectric actuator is glued on the back of the substrate and is actuated to give a radius of curvature that is varying from infinite (plane) to few meters. The ruling procedure, the piezoelectric actuator and the efficiency measurements in the soft X-rays will be presented. Some test cases are discussed for wavelengths shorter than 12 nm.

Paper Details

Date Published: 23 June 2017
PDF: 9 pages
Proc. SPIE 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV, 102370T (23 June 2017); doi: 10.1117/12.2267473
Show Author Affiliations
Stefano Bonora, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Nicola Fabris, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Univ. of Padova (Italy)
Fabio Frassetto, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Ennio Giovine, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Paolo Miotti, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Univ. of Padova (Italy)
Martino Quintavalla, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Luca Poletto, CNR-Istituto di Fotonica e Nanotecnologie (Italy)


Published in SPIE Proceedings Vol. 10237:
Advances in X-ray Free-Electron Lasers Instrumentation IV
Thomas Tschentscher; Luc Patthey, Editor(s)

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