title: Sublevel echoes selectively excited by light-pulse trains: synchronized-quantum-beat echoes.
abstract: We report on a new type of sublevel echoes, synchronized-quantum-beat (SQB) echoes, generated by a successive application of two resonant light-pulse trains. The echoes are selectively generated for a sublevel pair whose frequency splitting is equal to an integral multiple of the repetition frequency of the light pulses. By using mode locked laser pulses tuned to the D(1) transition, we observed SQB echoes (and free induction decay) for all Zeeman and hyperfine transitions in the ground state of sodium atoms in low magnetic fields.
authors.forename: M
authors.initials: M
authors.lastname: Tanigawa
authors.forename: Y
authors.initials: Y
authors.lastname: Fukuda
authors.forename: T
authors.initials: T
authors.lastname: Kohmoto
authors.forename: K
authors.initials: K
authors.lastname: Sakuno
authors.forename: T
authors.initials: T
authors.lastname: Hashi