1. Otto Schott Institute of Materials Research University of Jena Jena Germany
2. Institute of Glass and Glass Technology Technical University Bergakademie Freiberg Freiberg Germany
3. Department of Materials Science University of Tsukuba Ibaraki Japan
4. Institute of Chemistry Martin Luther University Halle‐Wittenberg Halle Germany
5. Leibniz Institute of Photonic Technology Jena Germany
6. Laboratory for Materials and Structures Tokyo Institute of Technology Yokohama Japan