Experimental Measurement of the Absolute Frequencies and Hyperfine Coupling Constants of ¹³³Cs Using a Femtosecond Optical Frequency Comb

High resolution two-photon spectrum of the transitions 6S_1/2 → 6P_3/2 → 8S_1/2, 9S_1/2 and 6S_1/2 → 6P_1/2 → 7D_3/2 in neutral ¹³³Cs are presented in a room-temperature vapor cell using a femtosecond optical frequency comb. Spectra are obtained by scanning the repetition frequency of the femtosecond optical frequency comb over the two-photon hyperfine structure. The centroid frequency of the 6S_1/2 → 8S_1/2, 9S_1/2, 7D_3/2 transitions are 729009798.80(17) MHz, 806761363.96(11) MHz, and 780894762.595(23) MHz, respectively. The hyperfine coupling constants of the corresponding states are also obtained. The results are consistent with the previous measurements.