1. Institute of Optics and Quantum Electronics, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena,
Germany
2. Helmholtz Institute Jena,
Fröbelstieg 3, 07743 Jena, Germany
3. Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena,
Germany