Fig. 4: First-order detection based on the self-dressing effect and second-order detection.
From: Self-dressing Rydberg atomic receiver based on laser-induced DC field
Sensitivity results measured at 20 kHz (a) and 100 kHz (b). Under the self-dressing effect, the signal amplitude input from the photodetector to the spectrum analyzer as a function of the power injected into the TEM cell by the signal source (red circles); red dashed lines represent the fitted trend of the first-order linear interval. The distance between the laser beam and the cell wall was adjusted to minimize the splitting of the \(|{{\rm{52D}}}_{5/2}\rangle\) energy level. At this point, the signal amplitude monitored at the second harmonic frequency as a function of the power injected into the TEM cell (blue squares) was used to evaluate the measurement capability of the second-order Stark effect; blue dashed lines represent the fitted trend of the second-order linear interval. Error bars in the figures represent the 1σ standard deviation from 5 measurements.
