Femtosecond Frequency Comb Measurement Of Absolute Frequencies And Hyperfine Coupling Constants In Cesium Vapor
We report measurements of absolute transition frequencies and hyperfine coupling constants for the 8S(1/2), 9S(1/2), 7D(3/2), and 7D(5/2) states in Cs-133 vapor. The stepwise excitation through either the 6P(1/2) or 6P(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 7P(1/2,3/2) -> 6S(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.
Stalnaker, Jason E., Vela Mbele, Vladislav Gerginov, Tara M. Fortier, et al. 2010. "Femtosecond Frequency Comb Measurement Of Absolute Frequencies And Hyperfine Coupling Constants In Cesium Vapor." Physical Review A 81(4): 043840.
American Physical Society
Physical Review A
Physics and Astronomy
2-photon spectroscopy, Light-pulses, Rubidium