We report measurements of absolute transition frequencies and hyperﬁne coupling constants for the 8S1/2 , 9S1/2 , 7D3/2 , and 7D5/2 states in 133 Cs vapor. The stepwise excitation through either the 6P1/2 or 6P3/2 intermediate state is performed directly with broadband laser light from a stabilized femtosecond laser optical-frequency comb. The laser beam is split, counter-propagated 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 7P1/2,3/2 → 6S1/2 branch 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 that are in agreement with other recent measurements for the 8S state and provide a two-order of magnitude improvement over previously published results for the 9S and 7D states.
Citation: Physical Review A (Atomic, Molecular and Optical Physics)
Pub Type: Journals
cesium, frequency measurement, optical frequency comb, atomic spectroscopy