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.
© 2012 Optical Society of America
Original Manuscript: June 5, 2012
Revised Manuscript: July 13, 2012
Manuscript Accepted: July 13, 2012
Published: August 8, 2012
Jongseok Lim, Kanghee Lee, and Jaewook Ahn, "Ultrafast Rabi flopping in a three-level energy ladder," Opt. Lett. 37, 3378-3380 (2012)