Figure 1 g
URL: https://data.nist.gov/od/ds/mds2-2669/fig1g.zip
Y-axis is the electric field determined by the separation of the two peaks in each trace data file, in V/m. X-axis in the coupling laser detuning in MHz, determined by the separation of the two peaks in the ref_cell data files, which is equal to 374 MHz. The color scale is the values in trace data files, averaged across the columns, normalized to the maximum value of the whole data set. Plot of the coupling frequency set to the 57D state and a constant RF field of strength omega/2? = 180 MHz applied to the 57D-54F transition (f = 23.4 GHz), we see the emergence of a two-RF photon Raman peak at Delta_c = 0. Each trace is the voltage on the oscilloscope with the RF power indicated in the filename. The Electric field is determined by the power using The x-axis of the raw traces is in ?pixels? that are linearly distributed in frequency space. This axis needs to be set/generated for the false color plots using the ref_cell traces (one per set of measurements is sufficient). These ref_cell traces show two distinct spectral peaks: one large one and smaller one to the left. The large one is the main EIT peak of interest and the smaller left one is the fine structure peak located at -374 MHz (when coupled to 57D). Finding the difference between these peaks in the number of oscilloscope ?pixels? can then be used to convert between pixels and frequency to generate the x-axis.
Source: Rydberg state engineering: A comparison of tuning schemes for continuous frequency sensing
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