Attosecond delay lines: design, characterization and applicationsAnkur Mandal, Mehra S. Sidhu, Jan M. Rost, Thomas Pfeifer and Kamal P. SinghEur. Phys. J. Spec. Top., 230 23 (2021) 4195-4213DOI: https://doi.org/10.1140/epjs/s11734-021-00261-3