1. Otto Schott Institute of Materials Research, Friedrich Schiller University, Fraunhoferstraße 6, 07743 Jena, Germany
2. Leibniz Institute of Photonic Technology, Leibniz-IPHT, Albert-Einstein-Straße 9, 07745 Jena, Germany
3. Fbgs Technologies GmbH, Winzerlaer Straße 2, 07745 Jena, Germany