1. Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
2. Institute of Applied Physics and Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany
3. DS Deutschland GmbH, Am Kabellager 11-13, 51063 Cologne, Germany
4. Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, 07743 Jena, Germany
5. Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Str. 7, 07745 Jena, Germany