Autler–Townes splitting in the trap-loss fluorescence spectroscopy due to single-step direct Rydberg excitation of cesium cold atomic ensemble

We experimentally investigate trap-loss spectra of the cesium 6 S 1/2 ( F = 4) → 71 P 3/2 Rydberg transition by combining atomic magneto-optical trap with narrow-linewidth, continuously tunable 318.6 nm ultraviolet laser. Specifically, atoms in are excited to state due laser single-step excitation, which leads reduction fluorescence. Based on spectroscopy technology, Autler–Townes (AT) splitting a strong cooling is observed, and parameter dependence AT interval investigated. The effective temperature cold measured using simplified time-of-flight fluorescence imaging. In addition, closed-loop feedback power stabilization carried out. This lays foundation for further experimental research related lasers, great significance development quantum computing information.