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We experimentally investigate trap-loss spectra of the cesium6S1/2(F=4)-71P3/2 Rydberg state by combining the cesium atomic magneto-opticaltrap with the narrow-linewidth, continuously-tunable 318.6 nm ultravioletlaser. That is, the atoms in the magneto-optical trap are excited to theRydberg state due to the ultraviolet laser single-step Rydberg excitation,which leads to the reduction of atomic fluorescence. Based on the trap-lossspectroscopy technology, the Autler-Townes splitting due to strong coolinglaser is observed, and the parameter dependence of the AT splitting interval oftrap-loss spectroscopy is investigated. Furthermore, the effective temperatureof cold atoms is measured by means of simplified time-of-flight fluorescenceimaging. In addition, closed-loop positive feedback power stabilization of318.6 nm ultraviolet laser is carried out. This lays the foundation for furtherexperimental research related to Rydberg atoms using ultraviolet lasers, whichis of great significance for the development of quantum computing and quantuminformation fields.

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