%0 Journal Article
%T Velocity-selective direct frequency-comb spectroscopy of atomic vapors
%A J. E. Stalnaker
%A S. L. Chen
%A M. E. Rowan
%A K. Nguyen
%A T. Pradhananga
%A C. A. Palm
%A D. F. Jackson Kimball
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevA.86.033832
%X We present an experimental and theoretical investigation of two-photon direct frequency-comb spectroscopy performed through velocity-selective excitation. In particular, we explore the effect of repetition rate on the $\textrm{5S}_{1/2}\rightarrow \textrm{5D}_{3/2, 5/2}$ two-photon transitions excited in a rubidium atomic vapor cell. The transitions occur via step-wise excitation through the $\textrm{5P}_{1/2, 3/2}$ states by use of the direct output of an optical frequency comb. Experiments were performed with two different frequency combs, one with a repetition rate of $\approx 925$ MHz and one with a repetition rate of $\approx 250$ MHz. The experimental spectra are compared to each other and to a theoretical model.
%U http://arxiv.org/abs/1206.0999v1