Figure 3: Numerical simulation of the signal propagation.
From: Coherent and dynamic beam splitting based on light storage in cold atoms
The group velocity of the signal is reduced when it encounters the EIT medium located between 0 to 10 mm. (a) The photonic component of the signal disappears at 2.4 μs when the FW control is turned off as it is mapped to the atomic spin wave excitation. By turning on the FW and BW controls at 4.4 μs, the input signal stored in the EIT medium is retrieved into the FW and BW outputs. OD is set to be 100 to consider a situation with negligible signal leakage. (b) However, in the case of low OD of 21, the signal is not fully compressed into the medium, so the front part of it is leaving the medium before the storage. γgs = 2π × 3.8 kHz in both (a,b).
