title: Ultrafast Rabi flopping in a three-level energy ladder.
abstract: We demonstrate Rabi oscillation of a resonant two-photon transition in a three-level ladder-type quantum system of gaseous rubidium atoms induced by a single femtosecond laser pulse. For this, we shape the flat-top spatial profile of the laser pulse and perform the ultrafast population cycling of the atoms as a function of pulse energy. The experimental result confirms that the Rabi frequency of the transition from a ground state to a final state depends linearly on the pulse area, although the transition is a two-photon process.
authors: Department of Physics, KAIST, Daejeon 305-701, South Korea.
authors: Jongseok
authors: J
authors: Lim
authors: Kanghee
authors: K
authors: Lee
authors: Jaewook
authors: J
authors: Ahn