1. Institute of Applied Physics, Abbe Center of Photonics; Friedrich Schiller University Jena; Albert-Einstein-Straße 15, 07745 Jena Germany
2. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH; Hahn-Meitner-Platz 1, 14109 Berlin Germany
3. Fraunhofer Institute for Applied Optics and Precision Engineering; Albert-Einstein-Straße 7, 07745 Jena Germany
4. Fraunhofer Gesellschaft, Headquarters; Hansastraße 27c, 80686 München Germany