1. Institute of Optics and Quantum Electronics, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena,
Germany
2. Abbe Center of Photonics, Friedrich Schiller University Jena, Albert Einstein Straße 6, 07745 Jena,
Germany
3. Helmholtz Institute Jena, Fröbelstieg 3, 07743
Jena, Germany
4. Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 3, 07743 Jena,
Germany
5. Helmholtzzentrum GSI-Darmstadt, Planckstr. 1,
64291 Darmstadt, Germany
6. Goethe University Frankfurt, Max-von-Laue-Str.
1, 60438 Frankfurt am Main, Germany