Figure 2 | Scientific Reports

Figure 2

From: Generation of correlated biphoton via four-wave mixing coexisting with multi-order fluorescence processes

Figure 2

(a) By fixing the wavelength of E2 at 794.981 nm, the probe transmission spectra versus Δ1 which the five curves from top to bottom are obtained with increased Δ3. The red and green dotted lines are the fit lines of the EIT and EIA. (b) Measured FWM signals versus Δ1 at discrete Δ3 correspondings to (a). (c) The FWM signals EF1 with increased Δ3 from left to right corresponding to (b). The black dotted line is the fit line of the FWM signals. (d) The FWM signals EF1 with increased Δ1.

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