Author Affiliations

Neetesh Singh,^1,* Milan Sinobad,¹ Jan Lorenzen,¹ Kai Wang,² Andreas C. Liapis,³ Henry Frankis,⁴ Mahmoud A. Gaafar,¹ Stefanie Haugg,⁵ Henry Francis,⁶ Jose Carreira,⁶ Michael Geiselmann,⁶ Tobias Herr,¹ Jonathan Bradley,⁴ Zhipei Sun,³ Sonia M Garicia-Blanco,² and Franz X Kärtner^1,7

¹Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Germany

²Integrated Optical Systems, MESA+ Institute for Nanotechnology, University of Twente, 7500AE, Enschede, The Netherlands

³Department of Electronic and Nanoengineering, Aalto University, Espoo 05140, Finland

⁴Department of Engineering Physics, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4L7, Canada

⁵Centre for hybrid Nanostructures, University of Hamburg, Luruper Chaussee 149,, 22761, Hamburg, Germany

⁶LIGENTEC SA, EPFL Innovation Par L, Chemin de la Dent-d’Oche 1B, Switzerland CH-1024 Ecublens, Switzerland.

⁷Department of Physics, Universität Hamburg, Jungiusstr. 9, 20355 Hamburg, Germany

^*Corresponding author: neetesh.singh@desy.de