Abstract
We report measurements of absolute transition frequencies and hyperfine coupling constants for the $8{S}_{1/2}$, $9{S}_{1/2}$, $7{D}_{3/2}$, and $7{D}_{5/2}$ states in $^{133}\mathrm{Cs}$ vapor. The stepwise excitation through either the $6{P}_{1/2}$ or $6{P}_{3/2}$ intermediate state is performed directly with broadband laser light from a stabilized femtosecond laser optical-frequency comb. The laser beam is split, counterpropagated, and focused into a room-temperature Cs vapor cell. The repetition rate of the frequency comb is scanned and we detect the fluorescence on the $7{P}_{1/2,3/2}\ensuremath{\rightarrow}6{S}_{1/2}$ branches of the decay of the excited states. The excitations to the different states are isolated by the introduction of narrow-bandwidth interference filters in the laser beam paths. Using a nonlinear least-squares method we find measurements of transition frequencies and hyperfine coupling constants that are in agreement with other recent measurements for the $8S$ state and provide improvement by $2$ orders of magnitude over previously published results for the $9S$ and $7D$ states.
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