title: Absolute frequency determination of the 5P3/2-->7S1/2 transition in 87Rb.
abstract: We report the absolute frequency of the important 5S(1/2)-->7S(1/2) two-photon transition in (87)Rb. We access the upper state using two dipole-allowed transitions via the intermediate 5P(3/2) state. This allows us to use much lower laser intensities compared to directly driving the two-photon transition, thereby avoiding potential errors due to the AC Stark shift. Collisional shifts are also minimized because the atomic density required is several orders of magnitude smaller. Our values are consistent with earlier frequency-comb measurements.
authors.affiliation: Department of Physics, Indian Institute of Science, Bangalore 560 012, India.
authors.forename: Kanhaiya
authors.initials: K
authors.lastname: Pandey
authors.forename: P V
authors.initials: PV
authors.lastname: Kumar
authors.forename: M V
authors.initials: MV
authors.lastname: Suryanarayana
authors.forename: Vasant
authors.initials: V
authors.lastname: Natarajan