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An electromagnetically induced transparency (EIT) of a cascade-three-level atom involving Rydberg level in a room-temperature cell, formed with a cesium 6S1/2-6P3/2-66S1/2 scheme, is employed to detect the Autler-Townes (AT) splitting resulted with a 15.21-GHz microwave field coupling the 66S1/2→65P1/2 transition. Microwave field induced AT splitting, fAT , is characterized by the distance of peak-to-peak of an EIT-AT spectrum. The fAT dependence on the microwave Rabi frequency, ΩMW , demonstrates two regions, the strong-coupling linear region, fAT ≈ ΩMW and the weak-coupling nonlinear region, fAT . ΩMW . The fAT dependencies on the probe and coupling Rabi frequency are also investigated. Using small probeand coupling-laser, the Rabi frequency is found to enlarge the linear regime and decrease the uncertainty of the microwave field measurements. The measurements agree with the calculations based on a four-level atomic model.

Nonlinearity of Microwave Electric Field Coupled Rydberg Electromagnetically Induced Transparency and Autler-Townes Splitting