title: Direct frequency comb measurements of absolute optical frequencies and population transfer dynamics.
abstract: A phase-stabilized femtosecond laser comb is directly used for high-resolution spectroscopy and absolute optical frequency measurements of one- and two-photon transitions in laser-cooled 87Rb atoms. Absolute atomic transition frequencies, such as the 5S1/2 F=2-->7S1/2 F"=2 two-photon resonance measured at 788,794 768,921 (44) kHz, are determined without a priori knowledge about their values. Detailed dynamics of population transfer driven by a sequence of pulses are uncovered and taken into account for the measurement of the 5P states via resonantly enhanced two-photon transitions.
authors.affiliation: JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA.
authors.forename: Adela
authors.initials: A
authors.lastname: Marian
authors.forename: Matthew C
authors.initials: MC
authors.lastname: Stowe
authors.forename: Daniel
authors.initials: D
authors.lastname: Felinto
authors.forename: Jun
authors.initials: J
authors.lastname: Ye