Figure 4
From: The simplest route to generating a train of attosecond pulses

Numerical experiment for attosecond pulse generation in an actual system (gaseous parahydrogen). (a) Schematic illustration of the setup and the Raman sideband generation scheme. (b) Power spectrum of the 12 Raman sidebands generated and their phases (i) before (blue circles) and (ii) after applying the NEC method (red dots). (c) The temporal intensity waveforms obtained.