Transitions between Rydberg states in two-color corotating circularly polarized laser pulses

Higher-order Raman (Λ, V and S) transitions between Rydberg states of hydrogen atom involving the absorption and emission of at least three photons in the interaction with two-color corotating circularly polarized laser pulses is presented. Our work uses the numerical solution to the corresponding time-dependent Schrdinger equation to model the interaction. The results for the interaction with (ω, 2ω)-fields show that the simultaneous interaction with both fields results in an excited state distribution over a broad range of magnetic quantum numbers. By preparation of the atom in specific Rydberg states, the impact of the Λ-, V-, and S-transitions are found by analysis of the final distribution of the excited states. The same mechanism is also demonstrated for two-color fields with larger difference in central frequencies, i.e. (ω, 3ω)- and (ω, 4ω)-fields.