Fig. 3: Relationship between the amplitude of transfer function T and frequency.
From: Self-dressing Rydberg atomic receiver based on laser-induced DC field
a Variation curves of \(|T(f)|\) measured using a conventional glass vapor cell and a sapphire vapor cell, respectively, with the probe laser power fixed at 120 μW and the coupling laser power at 20 mW. Black circles in the figure mark the positions where \(|T(f)|\) decreases by 3 dB, and vertical gray lines mark the difference value when the curves tend to be parallel as frequency decreases. b Variation curves of \(|T(f)|\) measured under different coupling laser powers (Pc) and external LED illumination conditions, with the laser beam fixed 2.4 mm below the cell wall. For external LED illumination, the illumination range covers the region from the top of the vapor cell to 1 mm below it to generate a vertically polarized DC field; the green LED power is 78 mW, and the blue LED power is 88 mW.
