Femtosecond frequency comb measurement of absolute frequencies and hyperfine coupling constants in cesium vapor
Jason Stalnaker, Vela Mbele, Vladislav Gerginov, Tara Fortier, Scott Diddams, Leo Hollberg, C E. Tanner
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.
Physical Review A (Atomic, Molecular and Optical Physics)
, Mbele, V.
, Gerginov, V.
, Fortier, T.
, Diddams, S.
, Hollberg, L.
and Tanner, C.
Femtosecond frequency comb measurement of absolute frequencies and hyperfine coupling constants in cesium vapor, Physical Review A (Atomic, Molecular and Optical Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904617
(Accessed December 8, 2023)