1. Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Albert‐Einstein‐Straße 15 Jena 07745 Germany
2. Science Program Texas A&M University at Qatar Doha P.O. Box 23874 Qatar
3. P. N. Lebedev Physical Institute of the Russian Academy of Sciences 53 Leninskiy Prospekt Moscow 119991 Russia
4. Leibniz Institute of Photonic Technology Albert‐Einstein‐Straße 9 Jena 07745 Germany
5. Institute of Electronic Structure and Laser (IESL) Foundation for Research and Technology–Hellas (FORTH) P.O. Box 1527 Heraklion GR‐71110 Greece
6. Materials Science and Technology Department University of Crete Heraklion 71003 Greece
7. Fraunhofer Institute for Applied Optics and Precision Engineering IOF Center of Excellence in Photonics Albert‐Einstein‐Straße 7 Jena 07745 Germany