  We experimentally investigate trap-loss spectra of the cesium
6S1/2(F=4)-71P3/2 Rydberg state by combining the cesium atomic magneto-optical
trap with the narrow-linewidth, continuously-tunable 318.6 nm ultraviolet
laser. That is, the atoms in the magneto-optical trap are excited to the
Rydberg state due to the ultraviolet laser single-step Rydberg excitation,
which leads to the reduction of atomic fluorescence. Based on the trap-loss
spectroscopy technology, the Autler-Townes splitting due to strong cooling
laser is observed, and the parameter dependence of the AT splitting interval of
trap-loss spectroscopy is investigated. Furthermore, the effective temperature
of cold atoms is measured by means of simplified time-of-flight fluorescence
imaging. In addition, closed-loop positive feedback power stabilization of
318.6 nm ultraviolet laser is carried out. This lays the foundation for further
experimental research related to Rydberg atoms using ultraviolet lasers, which
is of great significance for the development of quantum computing and quantum
information fields.
