*Pol Ribes-Pleguezuelo1, Erik BECKERT1, Christoph DAMM1, Axel BODEMANN1, Ramona EBERHARDT1, Andreas TÜNNERMANN1, Nicolaie PAVEL2, Oana-Valeria GRIGORE2, Gabriela CROITORU2, Catalina-Alice BRANDUS2, Nicolae-Tiberius VASILE2
(1. Fraunhofer Institute for Applied Optics and Precision Engineering IOF, 2. National Institute for Laser, Plasma and Radiation Physics, Laboratory of Solid-State Quantum Electronics Romania)