Figure 1 : Experimental scheme.

From: Experimental realization of stimulated Raman shortcut-to-adiabatic passage with cold atoms

Figure 1

(a) Experimental set-up. The laser-atom coupling scheme of the three-level Λ system is shown in the upper panel. Two ground states |F=1, mF=0〉=|1〉; and |F=2, mF=0〉=|2〉, and one excited state 52P3/2 (=|3〉)of 87Rb are selected as a typical three-level Λ system. The states |1〉, (|2〉) and |3〉 are coupled by pumping pulse ΩP(t) (Stokes pulse ΩS(t)). The single-photon detuning Δ between the Raman lasers and the excited state 52P3/2 is about 2.5 GHz. A magnetic field Bz is used to split the Zeeman sublevels. Two Raman laser fields (pumping ΩP(t) and Stokes ΩS(t)) with phase-locked are combined by a beam splitter (BS) and then send to interact with the cold atoms. The shapes of the Raman lasers are modulated by two AOMs driven by a radio source (RS). (b) The original Raman laser pulses in the usual STIRAP are two partially overlapping Gaussian shapes. (c) Modified Raman laser pulses for STIRSAP obtained from equation (3).