1. Max Planck Institute for the Science of Light, 91058 Erlangen, Germany
2. Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Physics, 91058 Erlangen, Germany
3. Institute of Applied Physics, Russian Academy of Sciences, 603950 Nizhny Novgorod, Russia
4. Lobachevsky State University of Nizhny Novgorod, 603022 Nizhny Novgorod, Russia
5. Institute of Chemistry, St. Petersburg State University, 26 Universitetskii prospect, St. Petersburg 198504, Russia
6. Institute of Physics, University of Graz, 8010 Graz, Austria