Figure 5
From: Robust Population Inversion by Polarization Selective Pulsed Excitation

Calculated total occupancy (sum of |X> and |Y> states, colour coded) as a function of the pulse delay and the total pulse area for cross-polarized pulses (
,
). For zero pulse delay, the pulse area dependence corresponds to an ordinary Rabi scenario, as obtained for a single +45° polarized pulse. Increasing or decreasing pulse delay results in a seamless transition to the discussed scenario with cross-polarized double pulses, which generates broad regions of robust inversion for total pulse areas at integer multiples of 2π.