title: Velocity selective optical pumping of Rb hyperfine lines induced by a train of femtosecond pulses.
abstract: We present direct observation of the velocity-selective optical pumping of the Rb ground state hyperfine levels induced by 5S(1/2) --> 5P(1/2) femtosecond pulse-train excitation. A modified direct frequency comb spectroscopy based on the fixed frequency comb and a weak cw scanning probe laser was developed. The femtosecond pulse-train excitation of a Doppler-broadened Rb four-level atomic vapor is investigated theoretically in the context of the density matrix formalism and the results are compared with the experiment.
authors.affiliation: Institute of Physics, Bijenicka 46, Zagreb, Croatia.
authors.forename: D
authors.initials: D
authors.lastname: Aumiler
authors.forename: T
authors.initials: T
authors.lastname: Ban
authors.forename: H
authors.initials: H
authors.lastname: Skenderović
authors.forename: G
authors.initials: G
authors.lastname: Pichler