Figure 3
From: Full characterization of an attosecond pulse generated using an infrared driver

Reconstructing the far-field pattern of an isolated attosecond pulse.
(a,b) Far-field pattern measured as a function of time delay for photon energy of 30 eV (a) and 60 eV (b). (c,d) The reconstructed far-field pattern obtained by using the phase retrieval algorithm for the photon energy of 30 eV (c) and 60 eV (d).