Speaker
Dr
Bruno Paroli
(Dipartimento di Fisica, Università degli Studi di Milano)
Description
Even though the generation of radiation carrying Orbital Angular Momentum (OAM) has been made both with visible light [1] and with millimeter-waves [2], the practical realization of high brilliance X-ray vortices is an open problem. The main limitation is related to the damage threshold of the optical elements.
Novel approaches to generate OAM X-ray by using relativistic beams interacting with ultra-high power lasers [3] brought absolutely new challenges for the development of measuring methods.
The real part of the coherence factor of an OAM radiation provides a direct measurement of the phase properties and topological charge of X-ray vortices, in fact the number of azimuthal lobes of the coherence factor increases as the topological charge is increased, thus providing a suitable method to diagnose X-ray beams with orbital angular momentum produced by ultra-relativistic beams in channeling phenomena. We show a novel diagnostic technique based on scanning interferometry called Asymmetric Lateral Coherence [4][5] to accurately measure the real part of the complex degree of coherent of X-ray OAM radiation.
Primary author
Dr
Bruno Paroli
(Dipartimento di Fisica, Università degli Studi di Milano)
Co-authors
Dr
Marco Potenza
(Dip. Fisica Univ. Milano - INFN Milano)
Dr
Mirko Siano
(Dipartimento di Fisica, Università degli Studi di Milano and INFN Sezione di Milano, via G. Celoria, 16, 20133 Milano, Italy)
