Figure 2: Variable beam splitting.
From: Coherent and dynamic beam splitting based on light storage in cold atoms
The thick red (orange) line represents the on/off sequence for the FW (BW) control laser. The input signal represented by the grey trace is slowed down with low loss when it propagates through the EIT medium with the FW control laser. Then, it is stored into the atomic ensemble by turning off the FW control laser. The blue (green) trace shows the detected FW (BW) output. (a) The FW operation. The stored signal is retrieved only into the FW output by turning on the FW control. (b) The FW/BW beam splitting operation. The stored signal is retrieved into both the FW and BW outputs by simultaneously applying the FW and BW controls at the same Rabi frequency. (c) The BW operation. The stored signal is retrieved only into the BW output by turning on the BW control. In all cases, Δ = 0. The superimposed solid curves are due to numerical simulation. See text for details.
