1. Fraunhofer Institute for Laser Technology (ILT), Steinbachstraße 15, D-52074 Aachen, Germany (R.S., I.M., H.K., R.N.); Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure and Laser (IESL), P.O. Box 1527, 711110 Heraklion, Crete, Greece (S.C., A.H., A.M., C.F.); and GAIKER Centro Tecnologico, Zamudio, Bizkaia, Spain (E.L., R.M.)