1. National Research Council—National Institute of Optics (CNR-INO), Largo E. Fermi, 6, 50125 Florence, Italy
2. OPD-Scuola di Alta Formazione e Studio, Via Alfani, 78, 50121 Florence, Italy
3. Department of Physics and Astronomy, University of Florence, Via G. Sansone, 1, 50019 Sesto Fiorentino, Italy
4. National Institute of Nuclear Physics (INFN), Florence Division, Via Bruno Rossi, 1, 50019 Sesto Fiorentino, Italy
5. Opificio delle Pietre Dure, V.le Filippo Strozzi, 1, 50129 Florence, Italy