Fig. 3 | Scientific Reports

Fig. 3

From: Intensity-difference squeezing from four-wave mixing in hot 85Rb and 87Rb atoms in single diode laser pumping system

Fig. 3

Observation of intensity-difference squeezing in the D1 line of 85Rb. (a) Intensity-difference noise spectra. Electronic, the electronic noise spectrum (black curve); pump, the pump scattering noise spectrum (gray curve); FWM, the intensity-difference squeezing spectrum (red curve); SQL, the standard quantum limit (blue curve). (b) Intensity-difference noise as a function of total optical power at an analysis frequency of 150 kHz; SQL (blue squares) and FWM (red circles). The ratio between the two slopes is calculated to be -8.7 dB.

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