Figure 3
From: Robust Population Inversion by Polarization Selective Pulsed Excitation

Calculated time evolution of the FSS states for the double pulse laser excitation (constructive phasing) shown in (a). |X> and |Y> occupancies versus time for the co-polarized case and 2 × 0.5 π pulse area (b) and for the cross-polarized case with 2 × 0.5 π (c) and 2 × 0.8 π pulse area (d).