CROSS CORRELATIONS IN RAMSEY PUMP-PROBE INTERFEROMETRY

This work presents expressions for the excited population resulting fr om a Ramsey pump-probe interferometric experiment in the short-weak-pu lse limit. It describes time-resolved measurements, which have no dire ct frequency-resolved analogy, in terms of the eigenenergies, amplitud es, and lifetimes of the excited wave packet. An interferometric phase cross correlation is shown to affect wave packet dynamics by shifting the dispersion of a Rydberg-Like wave packet with respect to zero del ay. This work phenomenologically introduces eigenstate lifetimes into the expression for the excited population in the Ramsey pump-probe int erferometric measurement. An interferometric intensity cross correlati on is shown to produce an excited population that, as a function of th e delay between pump and probe pulses, is asymmetric about zero delay when the excited eigenstate decays.